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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull vfs updates from Al Viro:
 "The first vfs pile, with deep apologies for being very late in this
  window.

  Assorted cleanups and fixes, plus a large preparatory part of iov_iter
  work.  There's a lot more of that, but it'll probably go into the next
  merge window - it *does* shape up nicely, removes a lot of
  boilerplate, gets rid of locking inconsistencie between aio_write and
  splice_write and I hope to get Kent's direct-io rewrite merged into
  the same queue, but some of the stuff after this point is having
  (mostly trivial) conflicts with the things already merged into
  mainline and with some I want more testing.

  This one passes LTP and xfstests without regressions, in addition to
  usual beating.  BTW, readahead02 in ltp syscalls testsuite has started
  giving failures since "mm/readahead.c: fix readahead failure for
  memoryless NUMA nodes and limit readahead pages" - might be a false
  positive, might be a real regression..."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (63 commits)
  missing bits of "splice: fix racy pipe->buffers uses"
  cifs: fix the race in cifs_writev()
  ceph_sync_{,direct_}write: fix an oops on ceph_osdc_new_request() failure
  kill generic_file_buffered_write()
  ocfs2_file_aio_write(): switch to generic_perform_write()
  ceph_aio_write(): switch to generic_perform_write()
  xfs_file_buffered_aio_write(): switch to generic_perform_write()
  export generic_perform_write(), start getting rid of generic_file_buffer_write()
  generic_file_direct_write(): get rid of ppos argument
  btrfs_file_aio_write(): get rid of ppos
  kill the 5th argument of generic_file_buffered_write()
  kill the 4th argument of __generic_file_aio_write()
  lustre: don't open-code kernel_recvmsg()
  ocfs2: don't open-code kernel_recvmsg()
  drbd: don't open-code kernel_recvmsg()
  constify blk_rq_map_user_iov() and friends
  lustre: switch to kernel_sendmsg()
  ocfs2: don't open-code kernel_sendmsg()
  take iov_iter stuff to mm/iov_iter.c
  process_vm_access: tidy up a bit
  ...
This commit is contained in:
Linus Torvalds 2014-04-12 14:49:50 -07:00
parent 0a7418f5f5 a786c06d9f
commit 5166701b36
76 changed files with 911 additions and 1537 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/filesystems/Locking
View File

@ -202,7 +202,7 @@ prototypes:
unsigned long *);
int (*migratepage)(struct address_space *, struct page *, struct page *);
int (*launder_page)(struct page *);
int (*is_partially_uptodate)(struct page *, read_descriptor_t *, unsigned long);
int (*is_partially_uptodate)(struct page *, unsigned long, unsigned long);
int (*error_remove_page)(struct address_space *, struct page *);
int (*swap_activate)(struct file *);
int (*swap_deactivate)(struct file *);

2
Documentation/filesystems/vfs.txt
View File

@ -596,7 +596,7 @@ struct address_space_operations {
/* migrate the contents of a page to the specified target */
int (*migratepage) (struct page *, struct page *);
int (*launder_page) (struct page *);
int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
int (*is_partially_uptodate) (struct page *, unsigned long,
unsigned long);
void (*is_dirty_writeback) (struct page *, bool *, bool *);
int (*error_remove_page) (struct mapping *mapping, struct page *page);

4
arch/mn10300/include/asm/highmem.h
View File

@ -70,7 +70,7 @@ static inline void kunmap(struct page *page)
* be used in IRQ contexts, so in some (very limited) cases we need
* it.
*/
static inline unsigned long kmap_atomic(struct page *page)
static inline void *kmap_atomic(struct page *page)
{
unsigned long vaddr;
int idx, type;
@ -89,7 +89,7 @@ static inline unsigned long kmap_atomic(struct page *page)
set_pte(kmap_pte - idx, mk_pte(page, kmap_prot));
local_flush_tlb_one(vaddr);
return vaddr;
return (void *)vaddr;
}
static inline void __kunmap_atomic(unsigned long vaddr)

1
arch/powerpc/configs/ppc6xx_defconfig
View File

@ -1244,7 +1244,6 @@ CONFIG_DEBUG_SPINLOCK_SLEEP=y
CONFIG_DEBUG_HIGHMEM=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
# CONFIG_RCU_CPU_STALL_DETECTOR is not set

1
arch/powerpc/configs/ps3_defconfig
View File

@ -174,7 +174,6 @@ CONFIG_DETECT_HUNG_TASK=y
CONFIG_PROVE_LOCKING=y
CONFIG_DEBUG_LOCKDEP=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_DEBUG_LIST=y
CONFIG_RCU_CPU_STALL_TIMEOUT=60

1
arch/s390/configs/default_defconfig
View File

@ -581,7 +581,6 @@ CONFIG_LOCK_STAT=y
CONFIG_DEBUG_LOCKDEP=y
CONFIG_DEBUG_ATOMIC_SLEEP=y
CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_DEBUG_NOTIFIERS=y

1
arch/sh/configs/rsk7203_defconfig
View File

@ -128,7 +128,6 @@ CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_FRAME_POINTER=y

1
arch/xtensa/configs/iss_defconfig
View File

@ -627,7 +627,6 @@ CONFIG_SCHED_DEBUG=y
# CONFIG_DEBUG_KOBJECT is not set
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set

1
arch/xtensa/configs/s6105_defconfig
View File

@ -569,7 +569,6 @@ CONFIG_DEBUG_SPINLOCK_SLEEP=y
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
CONFIG_DEBUG_NOMMU_REGIONS=y
# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set

2
block/blk-map.c
View File

@ -188,7 +188,7 @@ EXPORT_SYMBOL(blk_rq_map_user);
* unmapping.
*/
int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
struct rq_map_data *map_data, struct sg_iovec *iov,
struct rq_map_data *map_data, const struct sg_iovec *iov,
int iov_count, unsigned int len, gfp_t gfp_mask)
{
struct bio *bio;

12
drivers/block/drbd/drbd_receiver.c
View File

@ -469,24 +469,14 @@ static void drbd_wait_ee_list_empty(struct drbd_device *device,
static int drbd_recv_short(struct socket *sock, void *buf, size_t size, int flags)
{
mm_segment_t oldfs;
struct kvec iov = {
.iov_base = buf,
.iov_len = size,
};
struct msghdr msg = {
.msg_iovlen = 1,
.msg_iov = (struct iovec *)&iov,
.msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
};
int rv;
oldfs = get_fs();
set_fs(KERNEL_DS);
rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
set_fs(oldfs);
return rv;
return kernel_recvmsg(sock, &msg, &iov, 1, size, msg.msg_flags);
}
static int drbd_recv(struct drbd_connection *connection, void *buf, size_t size)

48
drivers/block/nbd.c
View File

@ -630,37 +630,29 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
}
case NBD_CLEAR_SOCK: {
struct file *file;
struct socket *sock = nbd->sock;
nbd->sock = NULL;
file = nbd->file;
nbd->file = NULL;
nbd_clear_que(nbd);
BUG_ON(!list_empty(&nbd->queue_head));
BUG_ON(!list_empty(&nbd->waiting_queue));
kill_bdev(bdev);
if (file)
fput(file);
if (sock)
sockfd_put(sock);
return 0;
}
case NBD_SET_SOCK: {
struct file *file;
if (nbd->file)
struct socket *sock;
int err;
if (nbd->sock)
return -EBUSY;
file = fget(arg);
if (file) {
struct inode *inode = file_inode(file);
if (S_ISSOCK(inode->i_mode)) {
nbd->file = file;
nbd->sock = SOCKET_I(inode);
if (max_part > 0)
bdev->bd_invalidated = 1;
nbd->disconnect = 0; /* we're connected now */
return 0;
} else {
fput(file);
}
sock = sockfd_lookup(arg, &err);
if (sock) {
nbd->sock = sock;
if (max_part > 0)
bdev->bd_invalidated = 1;
nbd->disconnect = 0; /* we're connected now */
return 0;
}
return -EINVAL;
}
@ -697,12 +689,12 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
case NBD_DO_IT: {
struct task_struct *thread;
struct file *file;
struct socket *sock;
int error;
if (nbd->pid)
return -EBUSY;
if (!nbd->file)
if (!nbd->sock)
return -EINVAL;
mutex_unlock(&nbd->tx_lock);
@ -731,15 +723,15 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
if (error)
return error;
sock_shutdown(nbd, 0);
file = nbd->file;
nbd->file = NULL;
sock = nbd->sock;
nbd->sock = NULL;
nbd_clear_que(nbd);
dev_warn(disk_to_dev(nbd->disk), "queue cleared\n");
kill_bdev(bdev);
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue);
set_device_ro(bdev, false);
if (file)
fput(file);
if (sock)
sockfd_put(sock);
nbd->flags = 0;
nbd->bytesize = 0;
bdev->bd_inode->i_size = 0;
@ -875,9 +867,7 @@ static int __init nbd_init(void)
for (i = 0; i < nbds_max; i++) {
struct gendisk *disk = nbd_dev[i].disk;
nbd_dev[i].file = NULL;
nbd_dev[i].magic = NBD_MAGIC;
nbd_dev[i].flags = 0;
INIT_LIST_HEAD(&nbd_dev[i].waiting_queue);
spin_lock_init(&nbd_dev[i].queue_lock);
INIT_LIST_HEAD(&nbd_dev[i].queue_head);

4
drivers/char/virtio_console.c
View File

@ -901,9 +901,9 @@ static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
if (len + offset > PAGE_SIZE)
len = PAGE_SIZE - offset;
src = buf->ops->map(pipe, buf, 1);
src = kmap_atomic(buf->page);
memcpy(page_address(page) + offset, src + buf->offset, len);
buf->ops->unmap(pipe, buf, src);
kunmap_atomic(src);
sg_set_page(&(sgl->sg[sgl->n]), page, len, offset);
}

60
drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib-linux.c
View File

@ -99,16 +99,7 @@ ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = tx->tx_niov;
#endif
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT
};
mm_segment_t oldmm = get_fs();
struct msghdr msg = {.msg_flags = MSG_DONTWAIT};
int i;
for (nob = i = 0; i < niov; i++) {
@ -120,9 +111,7 @@ ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
nob < tx->tx_resid)
msg.msg_flags |= MSG_MORE;
set_fs (KERNEL_DS);
rc = sock_sendmsg(sock, &msg, nob);
set_fs (oldmm);
rc = kernel_sendmsg(sock, &msg, (struct kvec *)scratchiov, niov, nob);
}
return rc;
}
@ -174,16 +163,7 @@ ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = tx->tx_nkiov;
#endif
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT
};
mm_segment_t oldmm = get_fs();
struct msghdr msg = {.msg_flags = MSG_DONTWAIT};
int i;
for (nob = i = 0; i < niov; i++) {
@ -196,9 +176,7 @@ ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
nob < tx->tx_resid)
msg.msg_flags |= MSG_MORE;
set_fs (KERNEL_DS);
rc = sock_sendmsg(sock, &msg, nob);
set_fs (oldmm);
rc = kernel_sendmsg(sock, &msg, (struct kvec *)scratchiov, niov, nob);
for (i = 0; i < niov; i++)
kunmap(kiov[i].kiov_page);
@ -237,15 +215,8 @@ ksocknal_lib_recv_iov (ksock_conn_t *conn)
#endif
struct iovec *iov = conn->ksnc_rx_iov;
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
mm_segment_t oldmm = get_fs();
int nob;
int i;
int rc;
@ -263,10 +234,8 @@ ksocknal_lib_recv_iov (ksock_conn_t *conn)
}
LASSERT (nob <= conn->ksnc_rx_nob_wanted);
set_fs (KERNEL_DS);
rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
/* NB this is just a boolean..........................^ */
set_fs (oldmm);
rc = kernel_recvmsg(conn->ksnc_sock, &msg,
(struct kvec *)scratchiov, niov, nob, MSG_DONTWAIT);
saved_csum = 0;
if (conn->ksnc_proto == &ksocknal_protocol_v2x) {
@ -355,14 +324,8 @@ ksocknal_lib_recv_kiov (ksock_conn_t *conn)
#endif
lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
mm_segment_t oldmm = get_fs();
int nob;
int i;
int rc;
@ -370,13 +333,14 @@ ksocknal_lib_recv_kiov (ksock_conn_t *conn)
void *addr;
int sum;
int fragnob;
int n;
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
addr = ksocknal_lib_kiov_vmap(kiov, niov, scratchiov, pages);
if (addr != NULL) {
nob = scratchiov[0].iov_len;
msg.msg_iovlen = 1;
n = 1;
} else {
for (nob = i = 0; i < niov; i++) {
@ -384,15 +348,13 @@ ksocknal_lib_recv_kiov (ksock_conn_t *conn)
scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
kiov[i].kiov_offset;
}
msg.msg_iovlen = niov;
n = niov;
}
LASSERT (nob <= conn->ksnc_rx_nob_wanted);
set_fs (KERNEL_DS);
rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
/* NB this is just a boolean.......................^ */
set_fs (oldmm);
rc = kernel_recvmsg(conn->ksnc_sock, &msg,
(struct kvec *)scratchiov, n, nob, MSG_DONTWAIT);
if (conn->ksnc_msg.ksm_csum != 0) {
for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {

24
drivers/staging/lustre/lustre/libcfs/linux/linux-tcpip.c
View File

@ -265,17 +265,11 @@ libcfs_sock_write (struct socket *sock, void *buffer, int nob, int timeout)
* empty enough to take the whole message immediately */
for (;;) {
struct iovec iov = {
struct kvec iov = {
.iov_base = buffer,
.iov_len = nob
};
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = (timeout == 0) ? MSG_DONTWAIT : 0
};
@ -297,11 +291,9 @@ libcfs_sock_write (struct socket *sock, void *buffer, int nob, int timeout)
}
}
set_fs (KERNEL_DS);
then = jiffies;
rc = sock_sendmsg (sock, &msg, iov.iov_len);
rc = kernel_sendmsg(sock, &msg, &iov, 1, nob);
ticks -= jiffies - then;
set_fs (oldmm);
if (rc == nob)
return 0;
@ -338,17 +330,11 @@ libcfs_sock_read (struct socket *sock, void *buffer, int nob, int timeout)
LASSERT (ticks > 0);
for (;;) {
struct iovec iov = {
struct kvec iov = {
.iov_base = buffer,
.iov_len = nob
};
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
@ -367,11 +353,9 @@ libcfs_sock_read (struct socket *sock, void *buffer, int nob, int timeout)
return rc;
}
set_fs(KERNEL_DS);
then = jiffies;
rc = sock_recvmsg(sock, &msg, iov.iov_len, 0);
rc = kernel_recvmsg(sock, &msg, &iov, 1, nob, 0);
ticks -= jiffies - then;
set_fs(oldmm);
if (rc < 0)
return rc;

23
drivers/staging/lustre/lustre/llite/symlink.c
View File

@ -115,27 +115,6 @@ failed:
return rc;
}
static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
struct ptlrpc_request *request;
char *symname;
int rc;
CDEBUG(D_VFSTRACE, "VFS Op\n");
ll_inode_size_lock(inode);
rc = ll_readlink_internal(inode, &request, &symname);
if (rc)
GOTO(out, rc);
rc = vfs_readlink(dentry, buffer, buflen, symname);
out:
ptlrpc_req_finished(request);
ll_inode_size_unlock(inode);
return rc;
}
static void *ll_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
@ -175,7 +154,7 @@ static void ll_put_link(struct dentry *dentry, struct nameidata *nd, void *cooki
}
struct inode_operations ll_fast_symlink_inode_operations = {
.readlink = ll_readlink,
.readlink = generic_readlink,
.setattr = ll_setattr,
.follow_link = ll_follow_link,
.put_link = ll_put_link,

8
drivers/staging/usbip/stub_dev.c
View File

@ -86,7 +86,6 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
struct stub_device *sdev = dev_get_drvdata(dev);
int sockfd = 0;
struct socket *socket;
ssize_t err = -EINVAL;
int rv;
if (!sdev) {
@ -99,6 +98,7 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
return -EINVAL;
if (sockfd != -1) {
int err;
dev_info(dev, "stub up\n");
spin_lock_irq(&sdev->ud.lock);
@ -108,7 +108,7 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
goto err;
}
socket = sockfd_to_socket(sockfd);
socket = sockfd_lookup(sockfd, &err);
if (!socket)
goto err;
@ -141,7 +141,7 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
err:
spin_unlock_irq(&sdev->ud.lock);
return err;
return -EINVAL;
}
static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
@ -211,7 +211,7 @@ static void stub_shutdown_connection(struct usbip_device *ud)
* not touch NULL socket.
*/
if (ud->tcp_socket) {
fput(ud->tcp_socket->file);
sockfd_put(ud->tcp_socket);
ud->tcp_socket = NULL;
}

25
drivers/staging/usbip/usbip_common.c
View File

@ -382,31 +382,6 @@ err:
}
EXPORT_SYMBOL_GPL(usbip_recv);
struct socket *sockfd_to_socket(unsigned int sockfd)
{
struct socket *socket;
struct file *file;
struct inode *inode;
file = fget(sockfd);
if (!file) {
pr_err("invalid sockfd\n");
return NULL;
}
inode = file_inode(file);
if (!inode || !S_ISSOCK(inode->i_mode)) {
fput(file);
return NULL;
}
socket = SOCKET_I(inode);
return socket;
}
EXPORT_SYMBOL_GPL(sockfd_to_socket);
/* there may be more cases to tweak the flags. */
static unsigned int tweak_transfer_flags(unsigned int flags)
{

1
drivers/staging/usbip/usbip_common.h
View File

@ -299,7 +299,6 @@ void usbip_dump_urb(struct urb *purb);
void usbip_dump_header(struct usbip_header *pdu);
int usbip_recv(struct socket *sock, void *buf, int size);
struct socket *sockfd_to_socket(unsigned int sockfd);
void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
int pack);

4
drivers/staging/usbip/vhci_hcd.c
View File

@ -788,7 +788,7 @@ static void vhci_shutdown_connection(struct usbip_device *ud)
/* active connection is closed */
if (vdev->ud.tcp_socket) {
fput(vdev->ud.tcp_socket->file);
sockfd_put(vdev->ud.tcp_socket);
vdev->ud.tcp_socket = NULL;
}
pr_info("release socket\n");
@ -835,7 +835,7 @@ static void vhci_device_reset(struct usbip_device *ud)
vdev->udev = NULL;
if (ud->tcp_socket) {
fput(ud->tcp_socket->file);
sockfd_put(ud->tcp_socket);
ud->tcp_socket = NULL;
}
ud->status = VDEV_ST_NULL;

6
drivers/staging/usbip/vhci_sysfs.c
View File

@ -176,6 +176,7 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
struct socket *socket;
int sockfd = 0;
__u32 rhport = 0, devid = 0, speed = 0;
int err;
/*
* @rhport: port number of vhci_hcd
@ -194,8 +195,7 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
return -EINVAL;
/* Extract socket from fd. */
/* The correct way to clean this up is to fput(socket->file). */
socket = sockfd_to_socket(sockfd);
socket = sockfd_lookup(sockfd, &err);
if (!socket)
return -EINVAL;
@ -211,7 +211,7 @@ static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
spin_unlock(&vdev->ud.lock);
spin_unlock(&the_controller->lock);
fput(socket->file);
sockfd_put(socket);
dev_err(dev, "port %d already used\n", rhport);
return -EINVAL;

14
drivers/vhost/net.c
View File

@ -818,9 +818,9 @@ static int vhost_net_release(struct inode *inode, struct file *f)
vhost_dev_cleanup(&n->dev, false);
vhost_net_vq_reset(n);
if (tx_sock)
fput(tx_sock->file);
sockfd_put(tx_sock);
if (rx_sock)
fput(rx_sock->file);
sockfd_put(rx_sock);
/* Make sure no callbacks are outstanding */
synchronize_rcu_bh();
/* We do an extra flush before freeing memory,
@ -860,7 +860,7 @@ static struct socket *get_raw_socket(int fd)
}
return sock;
err:
fput(sock->file);
sockfd_put(sock);
return ERR_PTR(r);
}
@ -966,7 +966,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
if (oldsock) {
vhost_net_flush_vq(n, index);
fput(oldsock->file);
sockfd_put(oldsock);
}
mutex_unlock(&n->dev.mutex);
@ -978,7 +978,7 @@ err_used:
if (ubufs)
vhost_net_ubuf_put_wait_and_free(ubufs);
err_ubufs:
fput(sock->file);
sockfd_put(sock);
err_vq:
mutex_unlock(&vq->mutex);
err:
@ -1009,9 +1009,9 @@ static long vhost_net_reset_owner(struct vhost_net *n)
done:
mutex_unlock(&n->dev.mutex);
if (tx_sock)
fput(tx_sock->file);
sockfd_put(tx_sock);
if (rx_sock)
fput(rx_sock->file);
sockfd_put(rx_sock);
return err;
}

10
fs/bio.c
View File

@ -1002,7 +1002,7 @@ struct bio_map_data {
};
static void bio_set_map_data(struct bio_map_data *bmd, struct bio *bio,
struct sg_iovec *iov, int iov_count,
const struct sg_iovec *iov, int iov_count,
int is_our_pages)
{
memcpy(bmd->sgvecs, iov, sizeof(struct sg_iovec) * iov_count);
@ -1022,7 +1022,7 @@ static struct bio_map_data *bio_alloc_map_data(int nr_segs,
sizeof(struct sg_iovec) * iov_count, gfp_mask);
}
static int __bio_copy_iov(struct bio *bio, struct sg_iovec *iov, int iov_count,
static int __bio_copy_iov(struct bio *bio, const struct sg_iovec *iov, int iov_count,
int to_user, int from_user, int do_free_page)
{
int ret = 0, i;
@ -1120,7 +1120,7 @@ EXPORT_SYMBOL(bio_uncopy_user);
*/
struct bio *bio_copy_user_iov(struct request_queue *q,
struct rq_map_data *map_data,
struct sg_iovec *iov, int iov_count,
const struct sg_iovec *iov, int iov_count,
int write_to_vm, gfp_t gfp_mask)
{
struct bio_map_data *bmd;
@ -1259,7 +1259,7 @@ EXPORT_SYMBOL(bio_copy_user);
static struct bio *__bio_map_user_iov(struct request_queue *q,
struct block_device *bdev,
struct sg_iovec *iov, int iov_count,
const struct sg_iovec *iov, int iov_count,
int write_to_vm, gfp_t gfp_mask)
{
int i, j;
@ -1407,7 +1407,7 @@ EXPORT_SYMBOL(bio_map_user);
* device. Returns an error pointer in case of error.
*/
struct bio *bio_map_user_iov(struct request_queue *q, struct block_device *bdev,
struct sg_iovec *iov, int iov_count,
const struct sg_iovec *iov, int iov_count,
int write_to_vm, gfp_t gfp_mask)
{
struct bio *bio;

2
fs/block_dev.c
View File

@ -1518,7 +1518,7 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
BUG_ON(iocb->ki_pos != pos);
blk_start_plug(&plug);
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
ret = __generic_file_aio_write(iocb, iov, nr_segs);
if (ret > 0) {
ssize_t err;

16
fs/btrfs/file.c
View File

@ -425,13 +425,8 @@ static noinline int btrfs_copy_from_user(loff_t pos, int num_pages,
struct page *page = prepared_pages[pg];
/*
* Copy data from userspace to the current page
*
* Disable pagefault to avoid recursive lock since
* the pages are already locked
*/
pagefault_disable();
copied = iov_iter_copy_from_user_atomic(page, i, offset, count);
pagefault_enable();
/* Flush processor's dcache for this page */
flush_dcache_page(page);
@ -1665,7 +1660,7 @@ again:
static ssize_t __btrfs_direct_write(struct kiocb *iocb,
const struct iovec *iov,
unsigned long nr_segs, loff_t pos,
loff_t *ppos, size_t count, size_t ocount)
size_t count, size_t ocount)
{
struct file *file = iocb->ki_filp;
struct iov_iter i;
@ -1674,7 +1669,7 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb,
loff_t endbyte;
int err;
written = generic_file_direct_write(iocb, iov, &nr_segs, pos, ppos,
written = generic_file_direct_write(iocb, iov, &nr_segs, pos,
count, ocount);
if (written < 0 || written == count)
@ -1693,7 +1688,7 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb,
if (err)
goto out;
written += written_buffered;
*ppos = pos + written_buffered;
iocb->ki_pos = pos + written_buffered;
invalidate_mapping_pages(file->f_mapping, pos >> PAGE_CACHE_SHIFT,
endbyte >> PAGE_CACHE_SHIFT);
out:
@ -1725,7 +1720,6 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
loff_t *ppos = &iocb->ki_pos;
u64 start_pos;
u64 end_pos;
ssize_t num_written = 0;
@ -1796,7 +1790,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
if (unlikely(file->f_flags & O_DIRECT)) {
num_written = __btrfs_direct_write(iocb, iov, nr_segs,
pos, ppos, count, ocount);
pos, count, ocount);
} else {
struct iov_iter i;
@ -1804,7 +1798,7 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
num_written = __btrfs_buffered_write(file, &i, pos);
if (num_written > 0)
*ppos = pos + num_written;
iocb->ki_pos = pos + num_written;
}
mutex_unlock(&inode->i_mutex);

6
fs/buffer.c
View File

@ -2114,8 +2114,8 @@ EXPORT_SYMBOL(generic_write_end);
* Returns true if all buffers which correspond to a file portion
* we want to read are uptodate.
*/
int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc,
unsigned long from)
int block_is_partially_uptodate(struct page *page, unsigned long from,
unsigned long count)
{
unsigned block_start, block_end, blocksize;
unsigned to;
@ -2127,7 +2127,7 @@ int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc,
head = page_buffers(page);
blocksize = head->b_size;
to = min_t(unsigned, PAGE_CACHE_SIZE - from, desc->count);
to = min_t(unsigned, PAGE_CACHE_SIZE - from, count);
to = from + to;
if (from < blocksize && to > PAGE_CACHE_SIZE - blocksize)
return 0;

1
fs/cachefiles/bind.c
View File

@ -124,7 +124,6 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache)
/* check parameters */
ret = -EOPNOTSUPP;
if (!root->d_inode ||
!root->d_inode->i_op ||
!root->d_inode->i_op->lookup ||
!root->d_inode->i_op->mkdir ||
!root->d_inode->i_op->setxattr ||

3
fs/cachefiles/namei.c
View File

@ -779,8 +779,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
}
ret = -EPERM;
if (!subdir->d_inode->i_op ||
!subdir->d_inode->i_op->setxattr ||
if (!subdir->d_inode->i_op->setxattr ||
!subdir->d_inode->i_op->getxattr ||
!subdir->d_inode->i_op->lookup ||
!subdir->d_inode->i_op->mkdir ||

12
fs/ceph/file.c
View File

@ -601,7 +601,7 @@ ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
break;
}
num_pages = calc_pages_for(page_align, len);
@ -719,7 +719,7 @@ static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
break;
}
/*
@ -972,6 +972,7 @@ retry_snap:
}
} else {
loff_t old_size = inode->i_size;
struct iov_iter from;
/*
* No need to acquire the i_truncate_mutex. Because
* the MDS revokes Fwb caps before sending truncate
@ -979,9 +980,10 @@ retry_snap:
* are pending vmtruncate. So write and vmtruncate
* can not run at the same time
*/
written = generic_file_buffered_write(iocb, iov, nr_segs,
pos, &iocb->ki_pos,
count, 0);
iov_iter_init(&from, iov, nr_segs, count, 0);
written = generic_perform_write(file, &from, pos);
if (likely(written >= 0))
iocb->ki_pos = pos + written;
if (inode->i_size > old_size)
ceph_fscache_update_objectsize(inode);
mutex_unlock(&inode->i_mutex);

1
fs/cifs/cifsfs.c
View File

@ -850,7 +850,6 @@ const struct inode_operations cifs_file_inode_ops = {
/* revalidate:cifs_revalidate, */
.setattr = cifs_setattr,
.getattr = cifs_getattr, /* do we need this anymore? */
.rename = cifs_rename,
.permission = cifs_permission,
#ifdef CONFIG_CIFS_XATTR
.setxattr = cifs_setxattr,

128
fs/cifs/file.c
View File

@ -2579,19 +2579,32 @@ cifs_writev(struct kiocb *iocb, const struct iovec *iov,
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
ssize_t rc = -EACCES;
loff_t lock_pos = pos;
loff_t lock_pos = iocb->ki_pos;
if (file->f_flags & O_APPEND)
lock_pos = i_size_read(inode);
/*
* We need to hold the sem to be sure nobody modifies lock list
* with a brlock that prevents writing.
*/
down_read(&cinode->lock_sem);
mutex_lock(&inode->i_mutex);
if (file->f_flags & O_APPEND)
lock_pos = i_size_read(inode);
if (!cifs_find_lock_conflict(cfile, lock_pos, iov_length(iov, nr_segs),
server->vals->exclusive_lock_type, NULL,
CIFS_WRITE_OP))
rc = generic_file_aio_write(iocb, iov, nr_segs, pos);
CIFS_WRITE_OP)) {
rc = __generic_file_aio_write(iocb, iov, nr_segs);
mutex_unlock(&inode->i_mutex);
if (rc > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - rc, rc);
if (rc < 0)
rc = err;
}
} else {
mutex_unlock(&inode->i_mutex);
}
up_read(&cinode->lock_sem);
return rc;
}
@ -2727,56 +2740,27 @@ cifs_retry_async_readv(struct cifs_readdata *rdata)
/**
* cifs_readdata_to_iov - copy data from pages in response to an iovec
* @rdata: the readdata response with list of pages holding data
* @iov: vector in which we should copy the data
* @nr_segs: number of segments in vector
* @offset: offset into file of the first iovec
* @copied: used to return the amount of data copied to the iov
* @iter: destination for our data
*
* This function copies data from a list of pages in a readdata response into
* an array of iovecs. It will first calculate where the data should go
* based on the info in the readdata and then copy the data into that spot.
*/
static ssize_t
cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
unsigned long nr_segs, loff_t offset, ssize_t *copied)
static int
cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
{
int rc = 0;
struct iov_iter ii;
size_t pos = rdata->offset - offset;
ssize_t remaining = rdata->bytes;
unsigned char *pdata;
size_t remaining = rdata->bytes;
unsigned int i;
/* set up iov_iter and advance to the correct offset */
iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
iov_iter_advance(&ii, pos);
*copied = 0;
for (i = 0; i < rdata->nr_pages; i++) {
ssize_t copy;
struct page *page = rdata->pages[i];
/* copy a whole page or whatever's left */
copy = min_t(ssize_t, remaining, PAGE_SIZE);
/* ...but limit it to whatever space is left in the iov */
copy = min_t(ssize_t, copy, iov_iter_count(&ii));
/* go while there's data to be copied and no errors */
if (copy && !rc) {
pdata = kmap(page);
rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset,
(int)copy);
kunmap(page);
if (!rc) {
*copied += copy;
remaining -= copy;
iov_iter_advance(&ii, copy);
}
}
size_t copy = min(remaining, PAGE_SIZE);
size_t written = copy_page_to_iter(page, 0, copy, iter);
remaining -= written;
if (written < copy && iov_iter_count(iter) > 0)
break;
}
return rc;
return remaining ? -EFAULT : 0;
}
static void
@ -2837,20 +2821,21 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
return total_read > 0 ? total_read : result;
}
static ssize_t
cifs_iovec_read(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *poffset)
ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
ssize_t rc;
size_t len, cur_len;
ssize_t total_read = 0;
loff_t offset = *poffset;
loff_t offset = pos;
unsigned int npages;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *tcon;
struct cifsFileInfo *open_file;
struct cifs_readdata *rdata, *tmp;
struct list_head rdata_list;
struct iov_iter to;
pid_t pid;
if (!nr_segs)
@ -2860,6 +2845,8 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
if (!len)
return 0;
iov_iter_init(&to, iov, nr_segs, len, 0);
INIT_LIST_HEAD(&rdata_list);
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
open_file = file->private_data;
@ -2917,55 +2904,44 @@ error:
if (!list_empty(&rdata_list))
rc = 0;
len = iov_iter_count(&to);
/* the loop below should proceed in the order of increasing offsets */
restart_loop:
list_for_each_entry_safe(rdata, tmp, &rdata_list, list) {
again:
if (!rc) {
ssize_t copied;
/* FIXME: freezable sleep too? */
rc = wait_for_completion_killable(&rdata->done);
if (rc)
rc = -EINTR;
else if (rdata->result)
else if (rdata->result) {
rc = rdata->result;
else {
rc = cifs_readdata_to_iov(rdata, iov,
nr_segs, *poffset,
&copied);
total_read += copied;
/* resend call if it's a retryable error */
if (rc == -EAGAIN) {
rc = cifs_retry_async_readv(rdata);
goto again;
}
} else {
rc = cifs_readdata_to_iov(rdata, &to);
}
/* resend call if it's a retryable error */
if (rc == -EAGAIN) {
rc = cifs_retry_async_readv(rdata);
goto restart_loop;
}
}
list_del_init(&rdata->list);
kref_put(&rdata->refcount, cifs_uncached_readdata_release);
}
total_read = len - iov_iter_count(&to);
cifs_stats_bytes_read(tcon, total_read);
*poffset += total_read;
/* mask nodata case */
if (rc == -ENODATA)
rc = 0;
return total_read ? total_read : rc;
}
ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
ssize_t read;
read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos);
if (read > 0)
iocb->ki_pos = pos;
return read;
if (total_read) {
iocb->ki_pos = pos + total_read;
return total_read;
}
return rc;
}
ssize_t

2
fs/exec.c
View File

@ -813,7 +813,7 @@ EXPORT_SYMBOL(kernel_read);
ssize_t read_code(struct file *file, unsigned long addr, loff_t pos, size_t len)
{
ssize_t res = file->f_op->read(file, (void __user *)addr, len, &pos);
ssize_t res = vfs_read(file, (void __user *)addr, len, &pos);
if (res > 0)
flush_icache_range(addr, addr + len);
return res;

2
fs/ext4/file.c
View File

@ -146,7 +146,7 @@ ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
overwrite = 1;
}
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
ret = __generic_file_aio_write(iocb, iov, nr_segs);
mutex_unlock(&inode->i_mutex);
if (ret > 0) {

11
fs/file.c
View File

@ -25,7 +25,10 @@
int sysctl_nr_open __read_mostly = 1024*1024;
int sysctl_nr_open_min = BITS_PER_LONG;
int sysctl_nr_open_max = 1024 * 1024; /* raised later */
/* our max() is unusable in constant expressions ;-/ */
#define __const_max(x, y) ((x) < (y) ? (x) : (y))
int sysctl_nr_open_max = __const_max(INT_MAX, ~(size_t)0/sizeof(void *)) &
-BITS_PER_LONG;
static void *alloc_fdmem(size_t size)
{
@ -429,12 +432,6 @@ void exit_files(struct task_struct *tsk)
}
}
void __init files_defer_init(void)
{
sysctl_nr_open_max = min((size_t)INT_MAX, ~(size_t)0/sizeof(void *)) &
-BITS_PER_LONG;
}
struct files_struct init_files = {
.count = ATOMIC_INIT(1),
.fdt = &init_files.fdtab,

43
fs/file_table.c
View File

@ -52,7 +52,6 @@ static void file_free_rcu(struct rcu_head *head)
static inline void file_free(struct file *f)
{
percpu_counter_dec(&nr_files);
file_check_state(f);
call_rcu(&f->f_u.fu_rcuhead, file_free_rcu);
}
@ -178,47 +177,12 @@ struct file *alloc_file(struct path *path, fmode_t mode,
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_mode = mode;
file->f_op = fop;
/*
* These mounts don't really matter in practice
* for r/o bind mounts. They aren't userspace-
* visible. We do this for consistency, and so
* that we can do debugging checks at __fput()
*/
if ((mode & FMODE_WRITE) && !special_file(path->dentry->d_inode->i_mode)) {
file_take_write(file);
WARN_ON(mnt_clone_write(path->mnt));
}
if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(path->dentry->d_inode);
return file;
}
EXPORT_SYMBOL(alloc_file);
/**
* drop_file_write_access - give up ability to write to a file
* @file: the file to which we will stop writing
*
* This is a central place which will give up the ability
* to write to @file, along with access to write through
* its vfsmount.
*/
static void drop_file_write_access(struct file *file)
{
struct vfsmount *mnt = file->f_path.mnt;
struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
put_write_access(inode);
if (special_file(inode->i_mode))
return;
if (file_check_writeable(file) != 0)
return;
__mnt_drop_write(mnt);
file_release_write(file);
}
/* the real guts of fput() - releasing the last reference to file
*/
static void __fput(struct file *file)
@ -253,8 +217,10 @@ static void __fput(struct file *file)
put_pid(file->f_owner.pid);
if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_dec(inode);
if (file->f_mode & FMODE_WRITE)
drop_file_write_access(file);
if (file->f_mode & FMODE_WRITER) {
put_write_access(inode);
__mnt_drop_write(mnt);
}
file->f_path.dentry = NULL;
file->f_path.mnt = NULL;
file->f_inode = NULL;
@ -359,6 +325,5 @@ void __init files_init(unsigned long mempages)
n = (mempages * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
files_defer_init();
percpu_counter_init(&nr_files, 0);
}

14
fs/fuse/dev.c
View File

@ -667,15 +667,15 @@ static void fuse_copy_finish(struct fuse_copy_state *cs)
struct pipe_buffer *buf = cs->currbuf;
if (!cs->write) {
buf->ops->unmap(cs->pipe, buf, cs->mapaddr);
kunmap_atomic(cs->mapaddr);
} else {
kunmap(buf->page);
kunmap_atomic(cs->mapaddr);
buf->len = PAGE_SIZE - cs->len;
}
cs->currbuf = NULL;
cs->mapaddr = NULL;
} else if (cs->mapaddr) {
kunmap(cs->pg);
kunmap_atomic(cs->mapaddr);
if (cs->write) {
flush_dcache_page(cs->pg);
set_page_dirty_lock(cs->pg);
@ -706,7 +706,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
BUG_ON(!cs->nr_segs);
cs->currbuf = buf;
cs->mapaddr = buf->ops->map(cs->pipe, buf, 0);
cs->mapaddr = kmap_atomic(buf->page);
cs->len = buf->len;
cs->buf = cs->mapaddr + buf->offset;
cs->pipebufs++;
@ -726,7 +726,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
buf->len = 0;
cs->currbuf = buf;
cs->mapaddr = kmap(page);
cs->mapaddr = kmap_atomic(page);
cs->buf = cs->mapaddr;
cs->len = PAGE_SIZE;
cs->pipebufs++;
@ -745,7 +745,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
return err;
BUG_ON(err != 1);
offset = cs->addr % PAGE_SIZE;
cs->mapaddr = kmap(cs->pg);
cs->mapaddr = kmap_atomic(cs->pg);
cs->buf = cs->mapaddr + offset;
cs->len = min(PAGE_SIZE - offset, cs->seglen);
cs->seglen -= cs->len;
@ -874,7 +874,7 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
out_fallback_unlock:
unlock_page(newpage);
out_fallback:
cs->mapaddr = buf->ops->map(cs->pipe, buf, 1);
cs->mapaddr = kmap_atomic(buf->page);
cs->buf = cs->mapaddr + buf->offset;
err = lock_request(cs->fc, cs->req);

5
fs/fuse/file.c
View File

@ -1086,9 +1086,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
if (mapping_writably_mapped(mapping))
flush_dcache_page(page);
pagefault_disable();
tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes);
pagefault_enable();
flush_dcache_page(page);
mark_page_accessed(page);
@ -1237,8 +1235,7 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
goto out;
if (file->f_flags & O_DIRECT) {
written = generic_file_direct_write(iocb, iov, &nr_segs,
pos, &iocb->ki_pos,
written = generic_file_direct_write(iocb, iov, &nr_segs, pos,
count, ocount);
if (written < 0 || written == count)
goto out;

5
fs/mount.h
View File

@ -10,7 +10,7 @@ struct mnt_namespace {
struct user_namespace *user_ns;
u64 seq; /* Sequence number to prevent loops */
wait_queue_head_t poll;
int event;
u64 event;
};
struct mnt_pcp {
@ -104,6 +104,9 @@ struct proc_mounts {
struct mnt_namespace *ns;
struct path root;
int (*show)(struct seq_file *, struct vfsmount *);
void *cached_mount;
u64 cached_event;
loff_t cached_index;
};
#define proc_mounts(p) (container_of((p), struct proc_mounts, m))

67
fs/namei.c
View File

@ -358,6 +358,7 @@ int generic_permission(struct inode *inode, int mask)
return -EACCES;
}
EXPORT_SYMBOL(generic_permission);
/*
* We _really_ want to just do "generic_permission()" without
@ -455,6 +456,7 @@ int inode_permission(struct inode *inode, int mask)
return retval;
return __inode_permission(inode, mask);
}
EXPORT_SYMBOL(inode_permission);
/**
* path_get - get a reference to a path
@ -924,6 +926,7 @@ int follow_up(struct path *path)
path->mnt = &parent->mnt;
return 1;
}
EXPORT_SYMBOL(follow_up);
/*
* Perform an automount
@ -1085,6 +1088,7 @@ int follow_down_one(struct path *path)
}
return 0;
}
EXPORT_SYMBOL(follow_down_one);
static inline bool managed_dentry_might_block(struct dentry *dentry)
{
@ -1223,6 +1227,7 @@ int follow_down(struct path *path)
}
return 0;
}
EXPORT_SYMBOL(follow_down);
/*
* Skip to top of mountpoint pile in refwalk mode for follow_dotdot()
@ -2025,6 +2030,7 @@ int kern_path(const char *name, unsigned int flags, struct path *path)
*path = nd.path;
return res;
}
EXPORT_SYMBOL(kern_path);
/**
* vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
@ -2049,6 +2055,7 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
*path = nd.path;
return err;
}
EXPORT_SYMBOL(vfs_path_lookup);
/*
* Restricted form of lookup. Doesn't follow links, single-component only,
@ -2111,6 +2118,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
return __lookup_hash(&this, base, 0);
}
EXPORT_SYMBOL(lookup_one_len);
int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty)
@ -2135,6 +2143,7 @@ int user_path_at(int dfd, const char __user *name, unsigned flags,
{
return user_path_at_empty(dfd, name, flags, path, NULL);
}
EXPORT_SYMBOL(user_path_at);
/*
* NB: most callers don't do anything directly with the reference to the
@ -2477,6 +2486,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);
return NULL;
}
EXPORT_SYMBOL(lock_rename);
void unlock_rename(struct dentry *p1, struct dentry *p2)
{
@ -2486,6 +2496,7 @@ void unlock_rename(struct dentry *p1, struct dentry *p2)
mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
}
}
EXPORT_SYMBOL(unlock_rename);
int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool want_excl)
@ -2506,6 +2517,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
fsnotify_create(dir, dentry);
return error;
}
EXPORT_SYMBOL(vfs_create);
static int may_open(struct path *path, int acc_mode, int flag)
{
@ -3375,6 +3387,7 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
fsnotify_create(dir, dentry);
return error;
}
EXPORT_SYMBOL(vfs_mknod);
static int may_mknod(umode_t mode)
{
@ -3464,6 +3477,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
fsnotify_mkdir(dir, dentry);
return error;
}
EXPORT_SYMBOL(vfs_mkdir);
SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
{
@ -3518,6 +3532,7 @@ void dentry_unhash(struct dentry *dentry)
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
}
EXPORT_SYMBOL(dentry_unhash);
int vfs_rmdir(struct inode *dir, struct dentry *dentry)
{
@ -3555,6 +3570,7 @@ out:
d_delete(dentry);
return error;
}
EXPORT_SYMBOL(vfs_rmdir);
static long do_rmdir(int dfd, const char __user *pathname)
{
@ -3672,6 +3688,7 @@ out:
return error;
}
EXPORT_SYMBOL(vfs_unlink);
/*
* Make sure that the actual truncation of the file will occur outside its
@ -3785,6 +3802,7 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
fsnotify_create(dir, dentry);
return error;
}
EXPORT_SYMBOL(vfs_symlink);
SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
@ -3893,6 +3911,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
fsnotify_link(dir, inode, new_dentry);
return error;
}
EXPORT_SYMBOL(vfs_link);
/*
* Hardlinks are often used in delicate situations. We avoid
@ -4152,6 +4171,7 @@ out:
return error;
}
EXPORT_SYMBOL(vfs_rename);
SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
int, newdfd, const char __user *, newname, unsigned int, flags)
@ -4304,11 +4324,9 @@ SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newna
return sys_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link)
int readlink_copy(char __user *buffer, int buflen, const char *link)
{
int len;
len = PTR_ERR(link);
int len = PTR_ERR(link);
if (IS_ERR(link))
goto out;
@ -4320,6 +4338,7 @@ int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const c
out:
return len;
}
EXPORT_SYMBOL(readlink_copy);
/*
* A helper for ->readlink(). This should be used *ONLY* for symlinks that
@ -4337,11 +4356,12 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
if (IS_ERR(cookie))
return PTR_ERR(cookie);
res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
res = readlink_copy(buffer, buflen, nd_get_link(&nd));
if (dentry->d_inode->i_op->put_link)
dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
return res;
}
EXPORT_SYMBOL(generic_readlink);
/* get the link contents into pagecache */
static char *page_getlink(struct dentry * dentry, struct page **ppage)
@ -4361,14 +4381,14 @@ static char *page_getlink(struct dentry * dentry, struct page **ppage)
int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct page *page = NULL;
char *s = page_getlink(dentry, &page);
int res = vfs_readlink(dentry,buffer,buflen,s);
int res = readlink_copy(buffer, buflen, page_getlink(dentry, &page));
if (page) {
kunmap(page);
page_cache_release(page);
}
return res;
}
EXPORT_SYMBOL(page_readlink);
void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
{
@ -4376,6 +4396,7 @@ void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
nd_set_link(nd, page_getlink(dentry, &page));
return page;
}
EXPORT_SYMBOL(page_follow_link_light);
void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
@ -4386,6 +4407,7 @@ void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
page_cache_release(page);
}
}
EXPORT_SYMBOL(page_put_link);
/*
* The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
@ -4423,45 +4445,18 @@ retry:
fail:
return err;
}
EXPORT_SYMBOL(__page_symlink);
int page_symlink(struct inode *inode, const char *symname, int len)
{
return __page_symlink(inode, symname, len,
!(mapping_gfp_mask(inode->i_mapping) & __GFP_FS));
}
EXPORT_SYMBOL(page_symlink);
const struct inode_operations page_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
};
EXPORT_SYMBOL(user_path_at);
EXPORT_SYMBOL(follow_down_one);
EXPORT_SYMBOL(follow_down);
EXPORT_SYMBOL(follow_up);
EXPORT_SYMBOL(get_write_access); /* nfsd */
EXPORT_SYMBOL(lock_rename);
EXPORT_SYMBOL(lookup_one_len);
EXPORT_SYMBOL(page_follow_link_light);
EXPORT_SYMBOL(page_put_link);
EXPORT_SYMBOL(page_readlink);
EXPORT_SYMBOL(__page_symlink);
EXPORT_SYMBOL(page_symlink);
EXPORT_SYMBOL(page_symlink_inode_operations);
EXPORT_SYMBOL(kern_path);
EXPORT_SYMBOL(vfs_path_lookup);
EXPORT_SYMBOL(inode_permission);
EXPORT_SYMBOL(unlock_rename);
EXPORT_SYMBOL(vfs_create);
EXPORT_SYMBOL(vfs_link);
EXPORT_SYMBOL(vfs_mkdir);
EXPORT_SYMBOL(vfs_mknod);
EXPORT_SYMBOL(generic_permission);
EXPORT_SYMBOL(vfs_readlink);
EXPORT_SYMBOL(vfs_rename);
EXPORT_SYMBOL(vfs_rmdir);
EXPORT_SYMBOL(vfs_symlink);
EXPORT_SYMBOL(vfs_unlink);
EXPORT_SYMBOL(dentry_unhash);
EXPORT_SYMBOL(generic_readlink);

56
fs/namespace.c
View File

@ -52,7 +52,7 @@ static int __init set_mphash_entries(char *str)
}
__setup("mphash_entries=", set_mphash_entries);
static int event;
static u64 event;
static DEFINE_IDA(mnt_id_ida);
static DEFINE_IDA(mnt_group_ida);
static DEFINE_SPINLOCK(mnt_id_lock);
@ -414,9 +414,7 @@ EXPORT_SYMBOL_GPL(mnt_clone_write);
*/
int __mnt_want_write_file(struct file *file)
{
struct inode *inode = file_inode(file);
if (!(file->f_mode & FMODE_WRITE) || special_file(inode->i_mode))
if (!(file->f_mode & FMODE_WRITER))
return __mnt_want_write(file->f_path.mnt);
else
return mnt_clone_write(file->f_path.mnt);
@ -570,13 +568,17 @@ int sb_prepare_remount_readonly(struct super_block *sb)
static void free_vfsmnt(struct mount *mnt)
{
kfree(mnt->mnt_devname);
mnt_free_id(mnt);
#ifdef CONFIG_SMP
free_percpu(mnt->mnt_pcp);
#endif
kmem_cache_free(mnt_cache, mnt);
}
static void delayed_free_vfsmnt(struct rcu_head *head)
{
free_vfsmnt(container_of(head, struct mount, mnt_rcu));
}
/* call under rcu_read_lock */
bool legitimize_mnt(struct vfsmount *bastard, unsigned seq)
{
@ -848,6 +850,7 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
root = mount_fs(type, flags, name, data);
if (IS_ERR(root)) {
mnt_free_id(mnt);
free_vfsmnt(mnt);
return ERR_CAST(root);
}
@ -885,7 +888,7 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
goto out_free;
}
mnt->mnt.mnt_flags = old->mnt.mnt_flags & ~MNT_WRITE_HOLD;
mnt->mnt.mnt_flags = old->mnt.mnt_flags & ~(MNT_WRITE_HOLD|MNT_MARKED);
/* Don't allow unprivileged users to change mount flags */
if ((flag & CL_UNPRIVILEGED) && (mnt->mnt.mnt_flags & MNT_READONLY))
mnt->mnt.mnt_flags |= MNT_LOCK_READONLY;
@ -928,20 +931,11 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
return mnt;
out_free:
mnt_free_id(mnt);
free_vfsmnt(mnt);
return ERR_PTR(err);
}
static void delayed_free(struct rcu_head *head)
{
struct mount *mnt = container_of(head, struct mount, mnt_rcu);
kfree(mnt->mnt_devname);
#ifdef CONFIG_SMP
free_percpu(mnt->mnt_pcp);
#endif
kmem_cache_free(mnt_cache, mnt);
}
static void mntput_no_expire(struct mount *mnt)
{
put_again:
@ -991,7 +985,7 @@ put_again:
dput(mnt->mnt.mnt_root);
deactivate_super(mnt->mnt.mnt_sb);
mnt_free_id(mnt);
call_rcu(&mnt->mnt_rcu, delayed_free);
call_rcu(&mnt->mnt_rcu, delayed_free_vfsmnt);
}
void mntput(struct vfsmount *mnt)
@ -1100,14 +1094,29 @@ static void *m_start(struct seq_file *m, loff_t *pos)
struct proc_mounts *p = proc_mounts(m);
down_read(&namespace_sem);
return seq_list_start(&p->ns->list, *pos);
if (p->cached_event == p->ns->event) {
void *v = p->cached_mount;
if (*pos == p->cached_index)
return v;
if (*pos == p->cached_index + 1) {
v = seq_list_next(v, &p->ns->list, &p->cached_index);
return p->cached_mount = v;
}
}
p->cached_event = p->ns->event;
p->cached_mount = seq_list_start(&p->ns->list, *pos);
p->cached_index = *pos;
return p->cached_mount;
}
static void *m_next(struct seq_file *m, void *v, loff_t *pos)
{
struct proc_mounts *p = proc_mounts(m);
return seq_list_next(v, &p->ns->list, pos);
p->cached_mount = seq_list_next(v, &p->ns->list, pos);
p->cached_index = *pos;
return p->cached_mount;
}
static void m_stop(struct seq_file *m, void *v)
@ -1661,9 +1670,9 @@ static int attach_recursive_mnt(struct mount *source_mnt,
if (err)
goto out;
err = propagate_mnt(dest_mnt, dest_mp, source_mnt, &tree_list);
lock_mount_hash();
if (err)
goto out_cleanup_ids;
lock_mount_hash();
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
set_mnt_shared(p);
} else {
@ -1690,6 +1699,11 @@ static int attach_recursive_mnt(struct mount *source_mnt,
return 0;
out_cleanup_ids:
while (!hlist_empty(&tree_list)) {
child = hlist_entry(tree_list.first, struct mount, mnt_hash);
umount_tree(child, 0);
}
unlock_mount_hash();
cleanup_group_ids(source_mnt, NULL);
out:
return err;
@ -2044,7 +2058,7 @@ static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
struct mount *parent;
int err;
mnt_flags &= ~(MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | MNT_DOOMED | MNT_SYNC_UMOUNT);
mnt_flags &= ~MNT_INTERNAL_FLAGS;
mp = lock_mount(path);
if (IS_ERR(mp))

50
fs/ncpfs/inode.c
View File

@ -470,9 +470,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
{
struct ncp_mount_data_kernel data;
struct ncp_server *server;
struct file *ncp_filp;
struct inode *root_inode;
struct inode *sock_inode;
struct socket *sock;
int error;
int default_bufsize;
@ -541,18 +539,10 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
if (!uid_valid(data.mounted_uid) || !uid_valid(data.uid) ||
!gid_valid(data.gid))
goto out;
error = -EBADF;
ncp_filp = fget(data.ncp_fd);
if (!ncp_filp)
goto out;
error = -ENOTSOCK;
sock_inode = file_inode(ncp_filp);
if (!S_ISSOCK(sock_inode->i_mode))
goto out_fput;
sock = SOCKET_I(sock_inode);
sock = sockfd_lookup(data.ncp_fd, &error);
if (!sock)
goto out_fput;
goto out;
if (sock->type == SOCK_STREAM)
default_bufsize = 0xF000;
else
@ -574,27 +564,16 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
if (error)
goto out_fput;
server->ncp_filp = ncp_filp;
server->ncp_sock = sock;
if (data.info_fd != -1) {
struct socket *info_sock;
error = -EBADF;
server->info_filp = fget(data.info_fd);
if (!server->info_filp)
goto out_bdi;
error = -ENOTSOCK;
sock_inode = file_inode(server->info_filp);
if (!S_ISSOCK(sock_inode->i_mode))
goto out_fput2;
info_sock = SOCKET_I(sock_inode);
struct socket *info_sock = sockfd_lookup(data.info_fd, &error);
if (!info_sock)
goto out_fput2;
goto out_bdi;
server->info_sock = info_sock;
error = -EBADFD;
if (info_sock->type != SOCK_STREAM)
goto out_fput2;
server->info_sock = info_sock;
}
/* server->lock = 0; */
@ -766,17 +745,12 @@ out_nls:
mutex_destroy(&server->root_setup_lock);
mutex_destroy(&server->mutex);
out_fput2:
if (server->info_filp)
fput(server->info_filp);
if (server->info_sock)
sockfd_put(server->info_sock);
out_bdi:
bdi_destroy(&server->bdi);
out_fput:
/* 23/12/1998 Marcin Dalecki <dalecki@cs.net.pl>:
*
* The previously used put_filp(ncp_filp); was bogus, since
* it doesn't perform proper unlocking.
*/
fput(ncp_filp);
sockfd_put(sock);
out:
put_pid(data.wdog_pid);
sb->s_fs_info = NULL;
@ -809,9 +783,9 @@ static void ncp_put_super(struct super_block *sb)
mutex_destroy(&server->root_setup_lock);
mutex_destroy(&server->mutex);
if (server->info_filp)
fput(server->info_filp);
fput(server->ncp_filp);
if (server->info_sock)
sockfd_put(server->info_sock);
sockfd_put(server->ncp_sock);
kill_pid(server->m.wdog_pid, SIGTERM, 1);
put_pid(server->m.wdog_pid);

2
fs/ncpfs/ncp_fs_sb.h
View File

@ -45,9 +45,7 @@ struct ncp_server {
__u8 name_space[NCP_NUMBER_OF_VOLUMES + 2];
struct file *ncp_filp; /* File pointer to ncp socket */
struct socket *ncp_sock;/* ncp socket */
struct file *info_filp;
struct socket *info_sock;
u8 sequence;

2
fs/ntfs/inode.c
View File

@ -1704,8 +1704,6 @@ static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
iput(bvi);
skip_large_index_stuff:
/* Setup the operations for this index inode. */
vi->i_op = NULL;
vi->i_fop = NULL;
vi->i_mapping->a_ops = &ntfs_mst_aops;
vi->i_blocks = ni->allocated_size >> 9;
/*

49
fs/ocfs2/cluster/tcp.c
View File

@ -916,57 +916,30 @@ static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
{
int ret;
mm_segment_t oldfs;
struct kvec vec = {
.iov_len = len,
.iov_base = data,
};
struct msghdr msg = {
.msg_iovlen = 1,
.msg_iov = (struct iovec *)&vec,
.msg_flags = MSG_DONTWAIT,
};
oldfs = get_fs();
set_fs(get_ds());
ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
set_fs(oldfs);
return ret;
struct kvec vec = { .iov_len = len, .iov_base = data, };
struct msghdr msg = { .msg_flags = MSG_DONTWAIT, };
return kernel_recvmsg(sock, &msg, &vec, 1, len, msg.msg_flags);
}
static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
size_t veclen, size_t total)
{
int ret;
mm_segment_t oldfs;
struct msghdr msg = {
.msg_iov = (struct iovec *)vec,
.msg_iovlen = veclen,
};
struct msghdr msg;
if (sock == NULL) {
ret = -EINVAL;
goto out;
}
oldfs = get_fs();
set_fs(get_ds());
ret = sock_sendmsg(sock, &msg, total);
set_fs(oldfs);
if (ret != total) {
mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
total);
if (ret >= 0)
ret = -EPIPE; /* should be smarter, I bet */
goto out;
}
ret = 0;
ret = kernel_sendmsg(sock, &msg, vec, veclen, total);
if (likely(ret == total))
return 0;
mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total);
if (ret >= 0)
ret = -EPIPE; /* should be smarter, I bet */
out:
if (ret < 0)
mlog(0, "returning error: %d\n", ret);
mlog(0, "returning error: %d\n", ret);
return ret;
}

9
fs/ocfs2/file.c
View File

@ -2367,15 +2367,18 @@ relock:
if (direct_io) {
written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
ppos, count, ocount);
count, ocount);
if (written < 0) {
ret = written;
goto out_dio;
}
} else {
struct iov_iter from;
iov_iter_init(&from, iov, nr_segs, count, 0);
current->backing_dev_info = file->f_mapping->backing_dev_info;
written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
ppos, count, 0);
written = generic_perform_write(file, &from, *ppos);
if (likely(written >= 0))
iocb->ki_pos = *ppos + written;
current->backing_dev_info = NULL;
}

68
fs/open.c
View File

@ -655,35 +655,6 @@ out:
return error;
}
/*
* You have to be very careful that these write
* counts get cleaned up in error cases and
* upon __fput(). This should probably never
* be called outside of __dentry_open().
*/
static inline int __get_file_write_access(struct inode *inode,
struct vfsmount *mnt)
{
int error;
error = get_write_access(inode);
if (error)
return error;
/*
* Do not take mount writer counts on
* special files since no writes to
* the mount itself will occur.
*/
if (!special_file(inode->i_mode)) {
/*
* Balanced in __fput()
*/
error = __mnt_want_write(mnt);
if (error)
put_write_access(inode);
}
return error;
}
int open_check_o_direct(struct file *f)
{
/* NB: we're sure to have correct a_ops only after f_op->open */
@ -708,26 +679,28 @@ static int do_dentry_open(struct file *f,
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
if (unlikely(f->f_flags & O_PATH))
f->f_mode = FMODE_PATH;
path_get(&f->f_path);
inode = f->f_inode = f->f_path.dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, f->f_path.mnt);
if (error)
goto cleanup_file;
if (!special_file(inode->i_mode))
file_take_write(f);
}
f->f_mapping = inode->i_mapping;
if (unlikely(f->f_mode & FMODE_PATH)) {
if (unlikely(f->f_flags & O_PATH)) {
f->f_mode = FMODE_PATH;
f->f_op = &empty_fops;
return 0;
}
if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
error = get_write_access(inode);
if (unlikely(error))
goto cleanup_file;
error = __mnt_want_write(f->f_path.mnt);
if (unlikely(error)) {
put_write_access(inode);
goto cleanup_file;
}
f->f_mode |= FMODE_WRITER;
}
/* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
if (S_ISREG(inode->i_mode))
f->f_mode |= FMODE_ATOMIC_POS;
@ -764,18 +737,9 @@ static int do_dentry_open(struct file *f,
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE) {
if (f->f_mode & FMODE_WRITER) {
put_write_access(inode);
if (!special_file(inode->i_mode)) {
/*
* We don't consider this a real
* mnt_want/drop_write() pair
* because it all happenend right
* here, so just reset the state.
*/
file_reset_write(f);
__mnt_drop_write(f->f_path.mnt);
}
__mnt_drop_write(f->f_path.mnt);
}
cleanup_file:
path_put(&f->f_path);

133
fs/pipe.c
View File

@ -142,55 +142,6 @@ pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len,
return 0;
}
static int
pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len,
int atomic)
{
unsigned long copy;
while (len > 0) {
while (!iov->iov_len)
iov++;
copy = min_t(unsigned long, len, iov->iov_len);
if (atomic) {
if (__copy_to_user_inatomic(iov->iov_base, from, copy))
return -EFAULT;
} else {
if (copy_to_user(iov->iov_base, from, copy))
return -EFAULT;
}
from += copy;
len -= copy;
iov->iov_base += copy;
iov->iov_len -= copy;
}
return 0;
}
/*
* Attempt to pre-fault in the user memory, so we can use atomic copies.
* Returns the number of bytes not faulted in.
*/
static int iov_fault_in_pages_write(struct iovec *iov, unsigned long len)
{
while (!iov->iov_len)
iov++;
while (len > 0) {
unsigned long this_len;
this_len = min_t(unsigned long, len, iov->iov_len);
if (fault_in_pages_writeable(iov->iov_base, this_len))
break;
len -= this_len;
iov++;
}
return len;
}
/*
* Pre-fault in the user memory, so we can use atomic copies.
*/
@ -225,52 +176,6 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
page_cache_release(page);
}
/**
* generic_pipe_buf_map - virtually map a pipe buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer that should be mapped
* @atomic: whether to use an atomic map
*
* Description:
* This function returns a kernel virtual address mapping for the
* pipe_buffer passed in @buf. If @atomic is set, an atomic map is provided
* and the caller has to be careful not to fault before calling
* the unmap function.
*
* Note that this function calls kmap_atomic() if @atomic != 0.
*/
void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, int atomic)
{
if (atomic) {
buf->flags |= PIPE_BUF_FLAG_ATOMIC;
return kmap_atomic(buf->page);
}
return kmap(buf->page);
}
EXPORT_SYMBOL(generic_pipe_buf_map);
/**
* generic_pipe_buf_unmap - unmap a previously mapped pipe buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer that should be unmapped
* @map_data: the data that the mapping function returned
*
* Description:
* This function undoes the mapping that ->map() provided.
*/
void generic_pipe_buf_unmap(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, void *map_data)
{
if (buf->flags & PIPE_BUF_FLAG_ATOMIC) {
buf->flags &= ~PIPE_BUF_FLAG_ATOMIC;
kunmap_atomic(map_data);
} else
kunmap(buf->page);
}
EXPORT_SYMBOL(generic_pipe_buf_unmap);
/**
* generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer
* @pipe: the pipe that the buffer belongs to
@ -351,8 +256,6 @@ EXPORT_SYMBOL(generic_pipe_buf_release);
static const struct pipe_buf_operations anon_pipe_buf_ops = {
.can_merge = 1,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = anon_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -361,8 +264,6 @@ static const struct pipe_buf_operations anon_pipe_buf_ops = {
static const struct pipe_buf_operations packet_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = anon_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -379,12 +280,15 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
ssize_t ret;
struct iovec *iov = (struct iovec *)_iov;
size_t total_len;
struct iov_iter iter;
total_len = iov_length(iov, nr_segs);
/* Null read succeeds. */
if (unlikely(total_len == 0))
return 0;
iov_iter_init(&iter, iov, nr_segs, total_len, 0);
do_wakeup = 0;
ret = 0;
__pipe_lock(pipe);
@ -394,9 +298,9 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
int curbuf = pipe->curbuf;
struct pipe_buffer *buf = pipe->bufs + curbuf;
const struct pipe_buf_operations *ops = buf->ops;
void *addr;
size_t chars = buf->len;
int error, atomic;
size_t written;
int error;
if (chars > total_len)
chars = total_len;
@ -408,21 +312,10 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
break;
}
atomic = !iov_fault_in_pages_write(iov, chars);
redo:
addr = ops->map(pipe, buf, atomic);
error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars, atomic);
ops->unmap(pipe, buf, addr);
if (unlikely(error)) {
/*
* Just retry with the slow path if we failed.
*/
if (atomic) {
atomic = 0;
goto redo;
}
written = copy_page_to_iter(buf->page, buf->offset, chars, &iter);
if (unlikely(written < chars)) {
if (!ret)
ret = error;
ret = -EFAULT;
break;
}
ret += chars;
@ -538,10 +431,16 @@ pipe_write(struct kiocb *iocb, const struct iovec *_iov,
iov_fault_in_pages_read(iov, chars);
redo1:
addr = ops->map(pipe, buf, atomic);
if (atomic)
addr = kmap_atomic(buf->page);
else
addr = kmap(buf->page);
error = pipe_iov_copy_from_user(offset + addr, iov,
chars, atomic);
ops->unmap(pipe, buf, addr);
if (atomic)
kunmap_atomic(addr);
else
kunmap(buf->page);
ret = error;
do_wakeup = 1;
if (error) {

198
fs/pnode.c
View File

@ -164,46 +164,94 @@ static struct mount *propagation_next(struct mount *m,
}
}
/*
* return the source mount to be used for cloning
*
* @dest the current destination mount
* @last_dest the last seen destination mount
* @last_src the last seen source mount
* @type return CL_SLAVE if the new mount has to be
* cloned as a slave.
*/
static struct mount *get_source(struct mount *dest,
struct mount *last_dest,
struct mount *last_src,
int *type)
static struct mount *next_group(struct mount *m, struct mount *origin)
{
struct mount *p_last_src = NULL;
struct mount *p_last_dest = NULL;
while (last_dest != dest->mnt_master) {
p_last_dest = last_dest;
p_last_src = last_src;
last_dest = last_dest->mnt_master;
last_src = last_src->mnt_master;
}
if (p_last_dest) {
do {
p_last_dest = next_peer(p_last_dest);
} while (IS_MNT_NEW(p_last_dest));
/* is that a peer of the earlier? */
if (dest == p_last_dest) {
*type = CL_MAKE_SHARED;
return p_last_src;
while (1) {
while (1) {
struct mount *next;
if (!IS_MNT_NEW(m) && !list_empty(&m->mnt_slave_list))
return first_slave(m);
next = next_peer(m);
if (m->mnt_group_id == origin->mnt_group_id) {
if (next == origin)
return NULL;
} else if (m->mnt_slave.next != &next->mnt_slave)
break;
m = next;
}
/* m is the last peer */
while (1) {
struct mount *master = m->mnt_master;
if (m->mnt_slave.next != &master->mnt_slave_list)
return next_slave(m);
m = next_peer(master);
if (master->mnt_group_id == origin->mnt_group_id)
break;
if (master->mnt_slave.next == &m->mnt_slave)
break;
m = master;
}
if (m == origin)
return NULL;
}
/* slave of the earlier, then */
*type = CL_SLAVE;
/* beginning of peer group among the slaves? */
if (IS_MNT_SHARED(dest))
*type |= CL_MAKE_SHARED;
return last_src;
}
/* all accesses are serialized by namespace_sem */
static struct user_namespace *user_ns;
static struct mount *last_dest, *last_source, *dest_master;
static struct mountpoint *mp;
static struct hlist_head *list;
static int propagate_one(struct mount *m)
{
struct mount *child;
int type;
/* skip ones added by this propagate_mnt() */
if (IS_MNT_NEW(m))
return 0;
/* skip if mountpoint isn't covered by it */
if (!is_subdir(mp->m_dentry, m->mnt.mnt_root))
return 0;
if (m->mnt_group_id == last_dest->mnt_group_id) {
type = CL_MAKE_SHARED;
} else {
struct mount *n, *p;
for (n = m; ; n = p) {
p = n->mnt_master;
if (p == dest_master || IS_MNT_MARKED(p)) {
while (last_dest->mnt_master != p) {
last_source = last_source->mnt_master;
last_dest = last_source->mnt_parent;
}
if (n->mnt_group_id != last_dest->mnt_group_id) {
last_source = last_source->mnt_master;
last_dest = last_source->mnt_parent;
}
break;
}
}
type = CL_SLAVE;
/* beginning of peer group among the slaves? */
if (IS_MNT_SHARED(m))
type |= CL_MAKE_SHARED;
}
/* Notice when we are propagating across user namespaces */
if (m->mnt_ns->user_ns != user_ns)
type |= CL_UNPRIVILEGED;
child = copy_tree(last_source, last_source->mnt.mnt_root, type);
if (IS_ERR(child))
return PTR_ERR(child);
mnt_set_mountpoint(m, mp, child);
last_dest = m;
last_source = child;
if (m->mnt_master != dest_master) {
read_seqlock_excl(&mount_lock);
SET_MNT_MARK(m->mnt_master);
read_sequnlock_excl(&mount_lock);
}
hlist_add_head(&child->mnt_hash, list);
return 0;
}
/*
@ -222,56 +270,48 @@ static struct mount *get_source(struct mount *dest,
int propagate_mnt(struct mount *dest_mnt, struct mountpoint *dest_mp,
struct mount *source_mnt, struct hlist_head *tree_list)
{
struct user_namespace *user_ns = current->nsproxy->mnt_ns->user_ns;
struct mount *m, *child;
struct mount *m, *n;
int ret = 0;
struct mount *prev_dest_mnt = dest_mnt;
struct mount *prev_src_mnt = source_mnt;
HLIST_HEAD(tmp_list);
for (m = propagation_next(dest_mnt, dest_mnt); m;
m = propagation_next(m, dest_mnt)) {
int type;
struct mount *source;
/*
* we don't want to bother passing tons of arguments to
* propagate_one(); everything is serialized by namespace_sem,
* so globals will do just fine.
*/
user_ns = current->nsproxy->mnt_ns->user_ns;
last_dest = dest_mnt;
last_source = source_mnt;
mp = dest_mp;
list = tree_list;
dest_master = dest_mnt->mnt_master;
if (IS_MNT_NEW(m))
continue;
source = get_source(m, prev_dest_mnt, prev_src_mnt, &type);
/* Notice when we are propagating across user namespaces */
if (m->mnt_ns->user_ns != user_ns)
type |= CL_UNPRIVILEGED;
child = copy_tree(source, source->mnt.mnt_root, type);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
tmp_list = *tree_list;
tmp_list.first->pprev = &tmp_list.first;
INIT_HLIST_HEAD(tree_list);
/* all peers of dest_mnt, except dest_mnt itself */
for (n = next_peer(dest_mnt); n != dest_mnt; n = next_peer(n)) {
ret = propagate_one(n);
if (ret)
goto out;
}
}
if (is_subdir(dest_mp->m_dentry, m->mnt.mnt_root)) {
mnt_set_mountpoint(m, dest_mp, child);
hlist_add_head(&child->mnt_hash, tree_list);
} else {
/*
* This can happen if the parent mount was bind mounted
* on some subdirectory of a shared/slave mount.
*/
hlist_add_head(&child->mnt_hash, &tmp_list);
}
prev_dest_mnt = m;
prev_src_mnt = child;
/* all slave groups */
for (m = next_group(dest_mnt, dest_mnt); m;
m = next_group(m, dest_mnt)) {
/* everything in that slave group */
n = m;
do {
ret = propagate_one(n);
if (ret)
goto out;
n = next_peer(n);
} while (n != m);
}
out:
lock_mount_hash();
while (!hlist_empty(&tmp_list)) {
child = hlist_entry(tmp_list.first, struct mount, mnt_hash);
umount_tree(child, 0);
read_seqlock_excl(&mount_lock);
hlist_for_each_entry(n, tree_list, mnt_hash) {
m = n->mnt_parent;
if (m->mnt_master != dest_mnt->mnt_master)
CLEAR_MNT_MARK(m->mnt_master);
}
unlock_mount_hash();
read_sequnlock_excl(&mount_lock);
return ret;
}

3
fs/pnode.h
View File

@ -16,6 +16,9 @@
#define IS_MNT_NEW(m) (!(m)->mnt_ns)
#define CLEAR_MNT_SHARED(m) ((m)->mnt.mnt_flags &= ~MNT_SHARED)
#define IS_MNT_UNBINDABLE(m) ((m)->mnt.mnt_flags & MNT_UNBINDABLE)
#define IS_MNT_MARKED(m) ((m)->mnt.mnt_flags & MNT_MARKED)
#define SET_MNT_MARK(m) ((m)->mnt.mnt_flags |= MNT_MARKED)
#define CLEAR_MNT_MARK(m) ((m)->mnt.mnt_flags &= ~MNT_MARKED)
#define CL_EXPIRE 0x01
#define CL_SLAVE 0x02

14
fs/proc/namespaces.c
View File

@ -146,7 +146,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
struct task_struct *task;
void *ns;
char name[50];
int len = -EACCES;
int res = -EACCES;
task = get_proc_task(inode);
if (!task)
@ -155,24 +155,18 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
len = -ENOENT;
res = -ENOENT;
ns = ns_ops->get(task);
if (!ns)
goto out_put_task;
snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns));
len = strlen(name);
if (len > buflen)
len = buflen;
if (copy_to_user(buffer, name, len))
len = -EFAULT;
res = readlink_copy(buffer, buflen, name);
ns_ops->put(ns);
out_put_task:
put_task_struct(task);
out:
return len;
return res;
}
static const struct inode_operations proc_ns_link_inode_operations = {

2
fs/proc/self.c
View File

@ -16,7 +16,7 @@ static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
if (!tgid)
return -ENOENT;
sprintf(tmp, "%d", tgid);
return vfs_readlink(dentry,buffer,buflen,tmp);
return readlink_copy(buffer, buflen, tmp);
}
static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)

1
fs/proc_namespace.c
View File

@ -267,6 +267,7 @@ static int mounts_open_common(struct inode *inode, struct file *file,
p->root = root;
p->m.poll_event = ns->event;
p->show = show;
p->cached_event = ~0ULL;
return 0;

130
fs/splice.c
View File

@ -136,8 +136,6 @@ error:
const struct pipe_buf_operations page_cache_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = page_cache_pipe_buf_confirm,
.release = page_cache_pipe_buf_release,
.steal = page_cache_pipe_buf_steal,
@ -156,8 +154,6 @@ static int user_page_pipe_buf_steal(struct pipe_inode_info *pipe,
static const struct pipe_buf_operations user_page_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = page_cache_pipe_buf_release,
.steal = user_page_pipe_buf_steal,
@ -547,8 +543,6 @@ EXPORT_SYMBOL(generic_file_splice_read);
static const struct pipe_buf_operations default_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = generic_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -564,8 +558,6 @@ static int generic_pipe_buf_nosteal(struct pipe_inode_info *pipe,
/* Pipe buffer operations for a socket and similar. */
const struct pipe_buf_operations nosteal_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = generic_pipe_buf_release,
.steal = generic_pipe_buf_nosteal,
@ -767,13 +759,13 @@ int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
goto out;
if (buf->page != page) {
char *src = buf->ops->map(pipe, buf, 1);
char *src = kmap_atomic(buf->page);
char *dst = kmap_atomic(page);
memcpy(dst + offset, src + buf->offset, this_len);
flush_dcache_page(page);
kunmap_atomic(dst);
buf->ops->unmap(pipe, buf, src);
kunmap_atomic(src);
}
ret = pagecache_write_end(file, mapping, sd->pos, this_len, this_len,
page, fsdata);
@ -1067,9 +1059,9 @@ static int write_pipe_buf(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
void *data;
loff_t tmp = sd->pos;
data = buf->ops->map(pipe, buf, 0);
data = kmap(buf->page);
ret = __kernel_write(sd->u.file, data + buf->offset, sd->len, &tmp);
buf->ops->unmap(pipe, buf, data);
kunmap(buf->page);
return ret;
}
@ -1528,116 +1520,48 @@ static int get_iovec_page_array(const struct iovec __user *iov,
static int pipe_to_user(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
struct splice_desc *sd)
{
char *src;
int ret;
/*
* See if we can use the atomic maps, by prefaulting in the
* pages and doing an atomic copy
*/
if (!fault_in_pages_writeable(sd->u.userptr, sd->len)) {
src = buf->ops->map(pipe, buf, 1);
ret = __copy_to_user_inatomic(sd->u.userptr, src + buf->offset,
sd->len);
buf->ops->unmap(pipe, buf, src);
if (!ret) {
ret = sd->len;
goto out;
}
}
/*
* No dice, use slow non-atomic map and copy
*/
src = buf->ops->map(pipe, buf, 0);
ret = sd->len;
if (copy_to_user(sd->u.userptr, src + buf->offset, sd->len))
ret = -EFAULT;
buf->ops->unmap(pipe, buf, src);
out:
if (ret > 0)
sd->u.userptr += ret;
return ret;
int n = copy_page_to_iter(buf->page, buf->offset, sd->len, sd->u.data);
return n == sd->len ? n : -EFAULT;
}
/*
* For lack of a better implementation, implement vmsplice() to userspace
* as a simple copy of the pipes pages to the user iov.
*/
static long vmsplice_to_user(struct file *file, const struct iovec __user *iov,
static long vmsplice_to_user(struct file *file, const struct iovec __user *uiov,
unsigned long nr_segs, unsigned int flags)
{
struct pipe_inode_info *pipe;
struct splice_desc sd;
ssize_t size;
int error;
long ret;
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
struct iov_iter iter;
ssize_t count = 0;
pipe = get_pipe_info(file);
if (!pipe)
return -EBADF;
ret = rw_copy_check_uvector(READ, uiov, nr_segs,
ARRAY_SIZE(iovstack), iovstack, &iov);
if (ret <= 0)
return ret;
iov_iter_init(&iter, iov, nr_segs, count, 0);
sd.len = 0;
sd.total_len = count;
sd.flags = flags;
sd.u.data = &iter;
sd.pos = 0;
pipe_lock(pipe);
error = ret = 0;
while (nr_segs) {
void __user *base;
size_t len;
/*
* Get user address base and length for this iovec.
*/
error = get_user(base, &iov->iov_base);
if (unlikely(error))
break;
error = get_user(len, &iov->iov_len);
if (unlikely(error))
break;
/*
* Sanity check this iovec. 0 read succeeds.
*/
if (unlikely(!len))
break;
if (unlikely(!base)) {
error = -EFAULT;
break;
}
if (unlikely(!access_ok(VERIFY_WRITE, base, len))) {
error = -EFAULT;
break;
}
sd.len = 0;
sd.total_len = len;
sd.flags = flags;
sd.u.userptr = base;
sd.pos = 0;
size = __splice_from_pipe(pipe, &sd, pipe_to_user);
if (size < 0) {
if (!ret)
ret = size;
break;
}
ret += size;
if (size < len)
break;
nr_segs--;
iov++;
}
ret = __splice_from_pipe(pipe, &sd, pipe_to_user);
pipe_unlock(pipe);
if (!ret)
ret = error;
if (iov != iovstack)
kfree(iov);
return ret;
}

2
fs/udf/file.c
View File

@ -171,7 +171,7 @@ static ssize_t udf_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
} else
up_write(&iinfo->i_data_sem);
retval = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
retval = __generic_file_aio_write(iocb, iov, nr_segs);
mutex_unlock(&inode->i_mutex);
if (retval > 0) {

13
fs/xfs/xfs_file.c
View File

@ -699,7 +699,7 @@ xfs_file_dio_aio_write(
trace_xfs_file_direct_write(ip, count, iocb->ki_pos, 0);
ret = generic_file_direct_write(iocb, iovp,
&nr_segs, pos, &iocb->ki_pos, count, ocount);
&nr_segs, pos, count, ocount);
out:
xfs_rw_iunlock(ip, iolock);
@ -715,7 +715,7 @@ xfs_file_buffered_aio_write(
const struct iovec *iovp,
unsigned long nr_segs,
loff_t pos,
size_t ocount)
size_t count)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@ -724,7 +724,7 @@ xfs_file_buffered_aio_write(
ssize_t ret;
int enospc = 0;
int iolock = XFS_IOLOCK_EXCL;
size_t count = ocount;
struct iov_iter from;
xfs_rw_ilock(ip, iolock);
@ -732,14 +732,15 @@ xfs_file_buffered_aio_write(
if (ret)
goto out;
iov_iter_init(&from, iovp, nr_segs, count, 0);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
write_retry:
trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, 0);
ret = generic_file_buffered_write(iocb, iovp, nr_segs,
pos, &iocb->ki_pos, count, 0);
ret = generic_perform_write(file, &from, pos);
if (likely(ret >= 0))
iocb->ki_pos = pos + ret;
/*
* If we just got an ENOSPC, try to write back all dirty inodes to
* convert delalloc space to free up some of the excess reserved

28
fs/xfs/xfs_ioctl.c
View File

@ -271,32 +271,6 @@ xfs_open_by_handle(
return error;
}
/*
* This is a copy from fs/namei.c:vfs_readlink(), except for removing it's
* unused first argument.
*/
STATIC int
do_readlink(
char __user *buffer,
int buflen,
const char *link)
{
int len;
len = PTR_ERR(link);
if (IS_ERR(link))
goto out;
len = strlen(link);
if (len > (unsigned) buflen)
len = buflen;
if (copy_to_user(buffer, link, len))
len = -EFAULT;
out:
return len;
}
int
xfs_readlink_by_handle(
struct file *parfilp,
@ -334,7 +308,7 @@ xfs_readlink_by_handle(
error = -xfs_readlink(XFS_I(dentry->d_inode), link);
if (error)
goto out_kfree;
error = do_readlink(hreq->ohandle, olen, link);
error = readlink_copy(hreq->ohandle, olen, link);
if (error)
goto out_kfree;

5
include/linux/bio.h
View File

@ -388,7 +388,7 @@ struct sg_iovec;
struct rq_map_data;
extern struct bio *bio_map_user_iov(struct request_queue *,
struct block_device *,
struct sg_iovec *, int, int, gfp_t);
const struct sg_iovec *, int, int, gfp_t);
extern void bio_unmap_user(struct bio *);
extern struct bio *bio_map_kern(struct request_queue *, void *, unsigned int,
gfp_t);
@ -414,7 +414,8 @@ extern int bio_alloc_pages(struct bio *bio, gfp_t gfp);
extern struct bio *bio_copy_user(struct request_queue *, struct rq_map_data *,
unsigned long, unsigned int, int, gfp_t);
extern struct bio *bio_copy_user_iov(struct request_queue *,
struct rq_map_data *, struct sg_iovec *,
struct rq_map_data *,
const struct sg_iovec *,
int, int, gfp_t);
extern int bio_uncopy_user(struct bio *);
void zero_fill_bio(struct bio *bio);

4
include/linux/blkdev.h
View File

@ -835,8 +835,8 @@ extern int blk_rq_map_user(struct request_queue *, struct request *,
extern int blk_rq_unmap_user(struct bio *);
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
struct rq_map_data *, struct sg_iovec *, int,
unsigned int, gfp_t);
struct rq_map_data *, const struct sg_iovec *,
int, unsigned int, gfp_t);
extern int blk_execute_rq(struct request_queue *, struct gendisk *,
struct request *, int);
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,

4
include/linux/buffer_head.h
View File

@ -210,8 +210,8 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
int block_write_full_page_endio(struct page *page, get_block_t *get_block,
struct writeback_control *wbc, bh_end_io_t *handler);
int block_read_full_page(struct page*, get_block_t*);
int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc,
unsigned long from);
int block_is_partially_uptodate(struct page *page, unsigned long from,
unsigned long count);
int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
unsigned flags, struct page **pagep, get_block_t *get_block);
int __block_write_begin(struct page *page, loff_t pos, unsigned len,

2
include/linux/fdtable.h
View File

@ -63,8 +63,6 @@ struct file_operations;
struct vfsmount;
struct dentry;
extern void __init files_defer_init(void);
#define rcu_dereference_check_fdtable(files, fdtfd) \
rcu_dereference_check((fdtfd), lockdep_is_held(&(files)->file_lock))

97
include/linux/fs.h
View File

@ -48,6 +48,7 @@ struct cred;
struct swap_info_struct;
struct seq_file;
struct workqueue_struct;
struct iov_iter;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
@ -125,6 +126,8 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
/* File needs atomic accesses to f_pos */
#define FMODE_ATOMIC_POS ((__force fmode_t)0x8000)
/* Write access to underlying fs */
#define FMODE_WRITER ((__force fmode_t)0x10000)
/* File was opened by fanotify and shouldn't generate fanotify events */
#define FMODE_NONOTIFY ((__force fmode_t)0x1000000)
@ -293,38 +296,6 @@ struct page;
struct address_space;
struct writeback_control;
struct iov_iter {
const struct iovec *iov;
unsigned long nr_segs;
size_t iov_offset;
size_t count;
};
size_t iov_iter_copy_from_user_atomic(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes);
size_t iov_iter_copy_from_user(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes);
void iov_iter_advance(struct iov_iter *i, size_t bytes);
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
size_t iov_iter_single_seg_count(const struct iov_iter *i);
static inline void iov_iter_init(struct iov_iter *i,
const struct iovec *iov, unsigned long nr_segs,
size_t count, size_t written)
{
i->iov = iov;
i->nr_segs = nr_segs;
i->iov_offset = 0;
i->count = count + written;
iov_iter_advance(i, written);
}
static inline size_t iov_iter_count(struct iov_iter *i)
{
return i->count;
}
/*
* "descriptor" for what we're up to with a read.
* This allows us to use the same read code yet
@ -383,7 +354,7 @@ struct address_space_operations {
int (*migratepage) (struct address_space *,
struct page *, struct page *, enum migrate_mode);
int (*launder_page) (struct page *);
int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
int (*is_partially_uptodate) (struct page *, unsigned long,
unsigned long);
void (*is_dirty_writeback) (struct page *, bool *, bool *);
int (*error_remove_page)(struct address_space *, struct page *);
@ -770,9 +741,6 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
index < ra->start + ra->size);
}
#define FILE_MNT_WRITE_TAKEN 1
#define FILE_MNT_WRITE_RELEASED 2
struct file {
union {
struct llist_node fu_llist;
@ -810,9 +778,6 @@ struct file {
struct list_head f_tfile_llink;
#endif /* #ifdef CONFIG_EPOLL */
struct address_space *f_mapping;
#ifdef CONFIG_DEBUG_WRITECOUNT
unsigned long f_mnt_write_state;
#endif
} __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
struct file_handle {
@ -830,49 +795,6 @@ static inline struct file *get_file(struct file *f)
#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
#define file_count(x) atomic_long_read(&(x)->f_count)
#ifdef CONFIG_DEBUG_WRITECOUNT
static inline void file_take_write(struct file *f)
{
WARN_ON(f->f_mnt_write_state != 0);
f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
}
static inline void file_release_write(struct file *f)
{
f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
}
static inline void file_reset_write(struct file *f)
{
f->f_mnt_write_state = 0;
}
static inline void file_check_state(struct file *f)
{
/*
* At this point, either both or neither of these bits
* should be set.
*/
WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
}
static inline int file_check_writeable(struct file *f)
{
if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
return 0;
printk(KERN_WARNING "writeable file with no "
"mnt_want_write()\n");
WARN_ON(1);
return -EINVAL;
}
#else /* !CONFIG_DEBUG_WRITECOUNT */
static inline void file_take_write(struct file *filp) {}
static inline void file_release_write(struct file *filp) {}
static inline void file_reset_write(struct file *filp) {}
static inline void file_check_state(struct file *filp) {}
static inline int file_check_writeable(struct file *filp)
{
return 0;
}
#endif /* CONFIG_DEBUG_WRITECOUNT */
#define MAX_NON_LFS ((1UL<<31) - 1)
/* Page cache limit. The filesystems should put that into their s_maxbytes
@ -2481,16 +2403,13 @@ extern int generic_file_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *);
extern int generic_file_remap_pages(struct vm_area_struct *, unsigned long addr,
unsigned long size, pgoff_t pgoff);
extern int file_read_actor(read_descriptor_t * desc, struct page *page, unsigned long offset, unsigned long size);
int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk);
extern ssize_t generic_file_aio_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long,
loff_t *);
extern ssize_t __generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long);
extern ssize_t generic_file_aio_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
extern ssize_t generic_file_direct_write(struct kiocb *, const struct iovec *,
unsigned long *, loff_t, loff_t *, size_t, size_t);
extern ssize_t generic_file_buffered_write(struct kiocb *, const struct iovec *,
unsigned long, loff_t, loff_t *, size_t, ssize_t);
unsigned long *, loff_t, size_t, size_t);
extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
extern int generic_segment_checks(const struct iovec *iov,
@ -2582,7 +2501,7 @@ extern const struct file_operations generic_ro_fops;
#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
extern int vfs_readlink(struct dentry *, char __user *, int, const char *);
extern int readlink_copy(char __user *, int, const char *);
extern int page_readlink(struct dentry *, char __user *, int);
extern void *page_follow_link_light(struct dentry *, struct nameidata *);
extern void page_put_link(struct dentry *, struct nameidata *, void *);

3
include/linux/mount.h
View File

@ -44,6 +44,8 @@ struct mnt_namespace;
#define MNT_SHARED_MASK (MNT_UNBINDABLE)
#define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE)
#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED)
#define MNT_INTERNAL 0x4000
@ -51,6 +53,7 @@ struct mnt_namespace;
#define MNT_LOCKED 0x800000
#define MNT_DOOMED 0x1000000
#define MNT_SYNC_UMOUNT 0x2000000
#define MNT_MARKED 0x4000000
struct vfsmount {
struct dentry *mnt_root; /* root of the mounted tree */

3
include/linux/nbd.h
View File

@ -24,8 +24,7 @@ struct request;
struct nbd_device {
int flags;
int harderror; /* Code of hard error */
struct socket * sock;
struct file * file; /* If == NULL, device is not ready, yet */
struct socket * sock; /* If == NULL, device is not ready, yet */
int magic;
spinlock_t queue_lock;

19
include/linux/pipe_fs_i.h
View File

@ -82,23 +82,6 @@ struct pipe_buf_operations {
*/
int can_merge;
/*
* ->map() returns a virtual address mapping of the pipe buffer.
* The last integer flag reflects whether this should be an atomic
* mapping or not. The atomic map is faster, however you can't take
* page faults before calling ->unmap() again. So if you need to eg
* access user data through copy_to/from_user(), then you must get
* a non-atomic map. ->map() uses the kmap_atomic slot for
* atomic maps, you have to be careful if mapping another page as
* source or destination for a copy.
*/
void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int);
/*
* Undoes ->map(), finishes the virtual mapping of the pipe buffer.
*/
void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *, void *);
/*
* ->confirm() verifies that the data in the pipe buffer is there
* and that the contents are good. If the pages in the pipe belong
@ -150,8 +133,6 @@ struct pipe_inode_info *alloc_pipe_info(void);
void free_pipe_info(struct pipe_inode_info *);
/* Generic pipe buffer ops functions */
void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int);
void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *);
void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *);
int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);

52
include/linux/uio.h
View File

@ -9,14 +9,23 @@
#ifndef __LINUX_UIO_H
#define __LINUX_UIO_H
#include <linux/kernel.h>
#include <uapi/linux/uio.h>
struct page;
struct kvec {
void *iov_base; /* and that should *never* hold a userland pointer */
size_t iov_len;
};
struct iov_iter {
const struct iovec *iov;
unsigned long nr_segs;
size_t iov_offset;
size_t count;
};
/*
* Total number of bytes covered by an iovec.
*
@ -34,8 +43,51 @@ static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
return ret;
}
static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
{
return (struct iovec) {
.iov_base = iter->iov->iov_base + iter->iov_offset,
.iov_len = min(iter->count,
iter->iov->iov_len - iter->iov_offset),
};
}
#define iov_for_each(iov, iter, start) \
for (iter = (start); \
(iter).count && \
((iov = iov_iter_iovec(&(iter))), 1); \
iov_iter_advance(&(iter), (iov).iov_len))
unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to);
size_t iov_iter_copy_from_user_atomic(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes);
size_t iov_iter_copy_from_user(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes);
void iov_iter_advance(struct iov_iter *i, size_t bytes);
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes);
size_t iov_iter_single_seg_count(const struct iov_iter *i);
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i);
static inline void iov_iter_init(struct iov_iter *i,
const struct iovec *iov, unsigned long nr_segs,
size_t count, size_t written)
{
i->iov = iov;
i->nr_segs = nr_segs;
i->iov_offset = 0;
i->count = count + written;
iov_iter_advance(i, written);
}
static inline size_t iov_iter_count(struct iov_iter *i)
{
return i->count;
}
int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len);
int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len);
#endif

4
kernel/relay.c
View File

@ -1195,8 +1195,6 @@ static void relay_pipe_buf_release(struct pipe_inode_info *pipe,
static const struct pipe_buf_operations relay_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = relay_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -1253,7 +1251,7 @@ static ssize_t subbuf_splice_actor(struct file *in,
subbuf_pages = rbuf->chan->alloc_size >> PAGE_SHIFT;
pidx = (read_start / PAGE_SIZE) % subbuf_pages;
poff = read_start & ~PAGE_MASK;
nr_pages = min_t(unsigned int, subbuf_pages, pipe->buffers);
nr_pages = min_t(unsigned int, subbuf_pages, spd.nr_pages_max);
for (total_len = 0; spd.nr_pages < nr_pages; spd.nr_pages++) {
unsigned int this_len, this_end, private;

8
kernel/trace/trace.c
View File

@ -4392,8 +4392,6 @@ static void tracing_spd_release_pipe(struct splice_pipe_desc *spd,
static const struct pipe_buf_operations tracing_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = generic_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -4488,7 +4486,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
trace_access_lock(iter->cpu_file);
/* Fill as many pages as possible. */
for (i = 0, rem = len; i < pipe->buffers && rem; i++) {
for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) {
spd.pages[i] = alloc_page(GFP_KERNEL);
if (!spd.pages[i])
break;
@ -5281,8 +5279,6 @@ static void buffer_pipe_buf_get(struct pipe_inode_info *pipe,
/* Pipe buffer operations for a buffer. */
static const struct pipe_buf_operations buffer_pipe_buf_ops = {
.can_merge = 0,
.map = generic_pipe_buf_map,
.unmap = generic_pipe_buf_unmap,
.confirm = generic_pipe_buf_confirm,
.release = buffer_pipe_buf_release,
.steal = generic_pipe_buf_steal,
@ -5358,7 +5354,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
trace_access_lock(iter->cpu_file);
entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file);
for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) {
for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) {
struct page *page;
int r;

10
lib/Kconfig.debug
View File

@ -1045,16 +1045,6 @@ config DEBUG_BUGVERBOSE
of the BUG call as well as the EIP and oops trace. This aids
debugging but costs about 70-100K of memory.
config DEBUG_WRITECOUNT
bool "Debug filesystem writers count"
depends on DEBUG_KERNEL
help
Enable this to catch wrong use of the writers count in struct
vfsmount. This will increase the size of each file struct by
32 bits.
If unsure, say N.
config DEBUG_LIST
bool "Debug linked list manipulation"
depends on DEBUG_KERNEL

3
mm/Makefile
View File

@ -17,7 +17,8 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \
util.o mmzone.o vmstat.o backing-dev.o \
mm_init.o mmu_context.o percpu.o slab_common.o \
compaction.o balloon_compaction.o vmacache.o \
interval_tree.o list_lru.o workingset.o $(mmu-y)
interval_tree.o list_lru.o workingset.o \
iov_iter.o $(mmu-y)
obj-y += init-mm.o

344
mm/filemap.c
View File

@ -77,7 +77,7 @@
* ->mmap_sem
* ->lock_page (access_process_vm)
*
* ->i_mutex (generic_file_buffered_write)
* ->i_mutex (generic_perform_write)
* ->mmap_sem (fault_in_pages_readable->do_page_fault)
*
* bdi->wb.list_lock
@ -1428,7 +1428,8 @@ static void shrink_readahead_size_eio(struct file *filp,
* do_generic_file_read - generic file read routine
* @filp: the file to read
* @ppos: current file position
* @desc: read_descriptor
* @iter: data destination
* @written: already copied
*
* This is a generic file read routine, and uses the
* mapping->a_ops->readpage() function for the actual low-level stuff.
@ -1436,8 +1437,8 @@ static void shrink_readahead_size_eio(struct file *filp,
* This is really ugly. But the goto's actually try to clarify some
* of the logic when it comes to error handling etc.
*/
static void do_generic_file_read(struct file *filp, loff_t *ppos,
read_descriptor_t *desc)
static ssize_t do_generic_file_read(struct file *filp, loff_t *ppos,
struct iov_iter *iter, ssize_t written)
{
struct address_space *mapping = filp->f_mapping;
struct inode *inode = mapping->host;
@ -1447,12 +1448,12 @@ static void do_generic_file_read(struct file *filp, loff_t *ppos,
pgoff_t prev_index;
unsigned long offset; /* offset into pagecache page */
unsigned int prev_offset;
int error;
int error = 0;
index = *ppos >> PAGE_CACHE_SHIFT;
prev_index = ra->prev_pos >> PAGE_CACHE_SHIFT;
prev_offset = ra->prev_pos & (PAGE_CACHE_SIZE-1);
last_index = (*ppos + desc->count + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
last_index = (*ppos + iter->count + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
offset = *ppos & ~PAGE_CACHE_MASK;
for (;;) {
@ -1487,7 +1488,7 @@ find_page:
if (!page->mapping)
goto page_not_up_to_date_locked;
if (!mapping->a_ops->is_partially_uptodate(page,
desc, offset))
offset, iter->count))
goto page_not_up_to_date_locked;
unlock_page(page);
}
@ -1537,24 +1538,23 @@ page_ok:
/*
* Ok, we have the page, and it's up-to-date, so
* now we can copy it to user space...
*
* The file_read_actor routine returns how many bytes were
* actually used..
* NOTE! This may not be the same as how much of a user buffer
* we filled up (we may be padding etc), so we can only update
* "pos" here (the actor routine has to update the user buffer
* pointers and the remaining count).
*/
ret = file_read_actor(desc, page, offset, nr);
ret = copy_page_to_iter(page, offset, nr, iter);
offset += ret;
index += offset >> PAGE_CACHE_SHIFT;
offset &= ~PAGE_CACHE_MASK;
prev_offset = offset;
page_cache_release(page);
if (ret == nr && desc->count)
continue;
goto out;
written += ret;
if (!iov_iter_count(iter))
goto out;
if (ret < nr) {
error = -EFAULT;
goto out;
}
continue;
page_not_up_to_date:
/* Get exclusive access to the page ... */
@ -1589,6 +1589,7 @@ readpage:
if (unlikely(error)) {
if (error == AOP_TRUNCATED_PAGE) {
page_cache_release(page);
error = 0;
goto find_page;
}
goto readpage_error;
@ -1619,7 +1620,6 @@ readpage:
readpage_error:
/* UHHUH! A synchronous read error occurred. Report it */
desc->error = error;
page_cache_release(page);
goto out;
@ -1630,16 +1630,17 @@ no_cached_page:
*/
page = page_cache_alloc_cold(mapping);
if (!page) {
desc->error = -ENOMEM;
error = -ENOMEM;
goto out;
}
error = add_to_page_cache_lru(page, mapping,
index, GFP_KERNEL);
if (error) {
page_cache_release(page);
if (error == -EEXIST)
if (error == -EEXIST) {
error = 0;
goto find_page;
desc->error = error;
}
goto out;
}
goto readpage;
@ -1652,44 +1653,7 @@ out:
*ppos = ((loff_t)index << PAGE_CACHE_SHIFT) + offset;
file_accessed(filp);
}
int file_read_actor(read_descriptor_t *desc, struct page *page,
unsigned long offset, unsigned long size)
{
char *kaddr;
unsigned long left, count = desc->count;
if (size > count)
size = count;
/*
* Faults on the destination of a read are common, so do it before
* taking the kmap.
*/
if (!fault_in_pages_writeable(desc->arg.buf, size)) {
kaddr = kmap_atomic(page);
left = __copy_to_user_inatomic(desc->arg.buf,
kaddr + offset, size);
kunmap_atomic(kaddr);
if (left == 0)
goto success;
}
/* Do it the slow way */
kaddr = kmap(page);
left = __copy_to_user(desc->arg.buf, kaddr + offset, size);
kunmap(page);
if (left) {
size -= left;
desc->error = -EFAULT;
}
success:
desc->count = count - size;
desc->written += size;
desc->arg.buf += size;
return size;
return written ? written : error;
}
/*
@ -1747,14 +1711,15 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
{
struct file *filp = iocb->ki_filp;
ssize_t retval;
unsigned long seg = 0;
size_t count;
loff_t *ppos = &iocb->ki_pos;
struct iov_iter i;
count = 0;
retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
if (retval)
return retval;
iov_iter_init(&i, iov, nr_segs, count, 0);
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (filp->f_flags & O_DIRECT) {
@ -1776,6 +1741,11 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
if (retval > 0) {
*ppos = pos + retval;
count -= retval;
/*
* If we did a short DIO read we need to skip the
* section of the iov that we've already read data into.
*/
iov_iter_advance(&i, retval);
}
/*
@ -1792,39 +1762,7 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
}
}
count = retval;
for (seg = 0; seg < nr_segs; seg++) {
read_descriptor_t desc;
loff_t offset = 0;
/*
* If we did a short DIO read we need to skip the section of the
* iov that we've already read data into.
*/
if (count) {
if (count > iov[seg].iov_len) {
count -= iov[seg].iov_len;
continue;
}
offset = count;
count = 0;
}
desc.written = 0;
desc.arg.buf = iov[seg].iov_base + offset;
desc.count = iov[seg].iov_len - offset;
if (desc.count == 0)
continue;
desc.error = 0;
do_generic_file_read(filp, ppos, &desc);
retval += desc.written;
if (desc.error) {
retval = retval ?: desc.error;
break;
}
if (desc.count > 0)
break;
}
retval = do_generic_file_read(filp, ppos, &i, retval);
out:
return retval;
}
@ -2335,150 +2273,6 @@ struct page *read_cache_page_gfp(struct address_space *mapping,
}
EXPORT_SYMBOL(read_cache_page_gfp);
static size_t __iovec_copy_from_user_inatomic(char *vaddr,
const struct iovec *iov, size_t base, size_t bytes)
{
size_t copied = 0, left = 0;
while (bytes) {
char __user *buf = iov->iov_base + base;
int copy = min(bytes, iov->iov_len - base);
base = 0;
left = __copy_from_user_inatomic(vaddr, buf, copy);
copied += copy;
bytes -= copy;
vaddr += copy;
iov++;
if (unlikely(left))
break;
}
return copied - left;
}
/*
* Copy as much as we can into the page and return the number of bytes which
* were successfully copied. If a fault is encountered then return the number of
* bytes which were copied.
*/
size_t iov_iter_copy_from_user_atomic(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes)
{
char *kaddr;
size_t copied;
BUG_ON(!in_atomic());
kaddr = kmap_atomic(page);
if (likely(i->nr_segs == 1)) {
int left;
char __user *buf = i->iov->iov_base + i->iov_offset;
left = __copy_from_user_inatomic(kaddr + offset, buf, bytes);
copied = bytes - left;
} else {
copied = __iovec_copy_from_user_inatomic(kaddr + offset,
i->iov, i->iov_offset, bytes);
}
kunmap_atomic(kaddr);
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user_atomic);
/*
* This has the same sideeffects and return value as
* iov_iter_copy_from_user_atomic().
* The difference is that it attempts to resolve faults.
* Page must not be locked.
*/
size_t iov_iter_copy_from_user(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes)
{
char *kaddr;
size_t copied;
kaddr = kmap(page);
if (likely(i->nr_segs == 1)) {
int left;
char __user *buf = i->iov->iov_base + i->iov_offset;
left = __copy_from_user(kaddr + offset, buf, bytes);
copied = bytes - left;
} else {
copied = __iovec_copy_from_user_inatomic(kaddr + offset,
i->iov, i->iov_offset, bytes);
}
kunmap(page);
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user);
void iov_iter_advance(struct iov_iter *i, size_t bytes)
{
BUG_ON(i->count < bytes);
if (likely(i->nr_segs == 1)) {
i->iov_offset += bytes;
i->count -= bytes;
} else {
const struct iovec *iov = i->iov;
size_t base = i->iov_offset;
unsigned long nr_segs = i->nr_segs;
/*
* The !iov->iov_len check ensures we skip over unlikely
* zero-length segments (without overruning the iovec).
*/
while (bytes || unlikely(i->count && !iov->iov_len)) {
int copy;
copy = min(bytes, iov->iov_len - base);
BUG_ON(!i->count || i->count < copy);
i->count -= copy;
bytes -= copy;
base += copy;
if (iov->iov_len == base) {
iov++;
nr_segs--;
base = 0;
}
}
i->iov = iov;
i->iov_offset = base;
i->nr_segs = nr_segs;
}
}
EXPORT_SYMBOL(iov_iter_advance);
/*
* Fault in the first iovec of the given iov_iter, to a maximum length
* of bytes. Returns 0 on success, or non-zero if the memory could not be
* accessed (ie. because it is an invalid address).
*
* writev-intensive code may want this to prefault several iovecs -- that
* would be possible (callers must not rely on the fact that _only_ the
* first iovec will be faulted with the current implementation).
*/
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes)
{
char __user *buf = i->iov->iov_base + i->iov_offset;
bytes = min(bytes, i->iov->iov_len - i->iov_offset);
return fault_in_pages_readable(buf, bytes);
}
EXPORT_SYMBOL(iov_iter_fault_in_readable);
/*
* Return the count of just the current iov_iter segment.
*/
size_t iov_iter_single_seg_count(const struct iov_iter *i)
{
const struct iovec *iov = i->iov;
if (i->nr_segs == 1)
return i->count;
else
return min(i->count, iov->iov_len - i->iov_offset);
}
EXPORT_SYMBOL(iov_iter_single_seg_count);
/*
* Performs necessary checks before doing a write
*
@ -2585,7 +2379,7 @@ EXPORT_SYMBOL(pagecache_write_end);
ssize_t
generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long *nr_segs, loff_t pos, loff_t *ppos,
unsigned long *nr_segs, loff_t pos,
size_t count, size_t ocount)
{
struct file *file = iocb->ki_filp;
@ -2646,7 +2440,7 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
i_size_write(inode, pos);
mark_inode_dirty(inode);
}
*ppos = pos;
iocb->ki_pos = pos;
}
out:
return written;
@ -2692,7 +2486,7 @@ found:
}
EXPORT_SYMBOL(grab_cache_page_write_begin);
static ssize_t generic_perform_write(struct file *file,
ssize_t generic_perform_write(struct file *file,
struct iov_iter *i, loff_t pos)
{
struct address_space *mapping = file->f_mapping;
@ -2742,9 +2536,7 @@ again:
if (mapping_writably_mapped(mapping))
flush_dcache_page(page);
pagefault_disable();
copied = iov_iter_copy_from_user_atomic(page, i, offset, bytes);
pagefault_enable();
flush_dcache_page(page);
mark_page_accessed(page);
@ -2782,27 +2574,7 @@ again:
return written ? written : status;
}
ssize_t
generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos, loff_t *ppos,
size_t count, ssize_t written)
{
struct file *file = iocb->ki_filp;
ssize_t status;
struct iov_iter i;
iov_iter_init(&i, iov, nr_segs, count, written);
status = generic_perform_write(file, &i, pos);
if (likely(status >= 0)) {
written += status;
*ppos = pos + status;
}
return written ? written : status;
}
EXPORT_SYMBOL(generic_file_buffered_write);
EXPORT_SYMBOL(generic_perform_write);
/**
* __generic_file_aio_write - write data to a file
@ -2824,16 +2596,18 @@ EXPORT_SYMBOL(generic_file_buffered_write);
* avoid syncing under i_mutex.
*/
ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos)
unsigned long nr_segs)
{
struct file *file = iocb->ki_filp;
struct address_space * mapping = file->f_mapping;
size_t ocount; /* original count */
size_t count; /* after file limit checks */
struct inode *inode = mapping->host;
loff_t pos;
ssize_t written;
loff_t pos = iocb->ki_pos;
ssize_t written = 0;
ssize_t err;
ssize_t status;
struct iov_iter from;
ocount = 0;
err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
@ -2841,12 +2615,9 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
return err;
count = ocount;
pos = *ppos;
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
written = 0;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out;
@ -2862,45 +2633,47 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (err)
goto out;
iov_iter_init(&from, iov, nr_segs, count, 0);
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (unlikely(file->f_flags & O_DIRECT)) {
loff_t endbyte;
ssize_t written_buffered;
written = generic_file_direct_write(iocb, iov, &nr_segs, pos,
ppos, count, ocount);
written = generic_file_direct_write(iocb, iov, &from.nr_segs, pos,
count, ocount);
if (written < 0 || written == count)
goto out;
iov_iter_advance(&from, written);
/*
* direct-io write to a hole: fall through to buffered I/O
* for completing the rest of the request.
*/
pos += written;
count -= written;
written_buffered = generic_file_buffered_write(iocb, iov,
nr_segs, pos, ppos, count,
written);
status = generic_perform_write(file, &from, pos);
/*
* If generic_file_buffered_write() retuned a synchronous error
* If generic_perform_write() returned a synchronous error
* then we want to return the number of bytes which were
* direct-written, or the error code if that was zero. Note
* that this differs from normal direct-io semantics, which
* will return -EFOO even if some bytes were written.
*/
if (written_buffered < 0) {
err = written_buffered;
if (unlikely(status < 0) && !written) {
err = status;
goto out;
}
iocb->ki_pos = pos + status;
/*
* We need to ensure that the page cache pages are written to
* disk and invalidated to preserve the expected O_DIRECT
* semantics.
*/
endbyte = pos + written_buffered - written - 1;
endbyte = pos + status - 1;
err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte);
if (err == 0) {
written = written_buffered;
written += status;
invalidate_mapping_pages(mapping,
pos >> PAGE_CACHE_SHIFT,
endbyte >> PAGE_CACHE_SHIFT);
@ -2911,8 +2684,9 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
*/
}
} else {
written = generic_file_buffered_write(iocb, iov, nr_segs,
pos, ppos, count, written);
written = generic_perform_write(file, &from, pos);
if (likely(written >= 0))
iocb->ki_pos = pos + written;
}
out:
current->backing_dev_info = NULL;
@ -2941,7 +2715,7 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
BUG_ON(iocb->ki_pos != pos);
mutex_lock(&inode->i_mutex);
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
ret = __generic_file_aio_write(iocb, iov, nr_segs);
mutex_unlock(&inode->i_mutex);
if (ret > 0) {

224
mm/iov_iter.c Normal file
View File

@ -0,0 +1,224 @@
#include <linux/export.h>
#include <linux/uio.h>
#include <linux/pagemap.h>
size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes,
struct iov_iter *i)
{
size_t skip, copy, left, wanted;
const struct iovec *iov;
char __user *buf;
void *kaddr, *from;
if (unlikely(bytes > i->count))
bytes = i->count;
if (unlikely(!bytes))
return 0;
wanted = bytes;
iov = i->iov;
skip = i->iov_offset;
buf = iov->iov_base + skip;
copy = min(bytes, iov->iov_len - skip);
if (!fault_in_pages_writeable(buf, copy)) {
kaddr = kmap_atomic(page);
from = kaddr + offset;
/* first chunk, usually the only one */
left = __copy_to_user_inatomic(buf, from, copy);
copy -= left;
skip += copy;
from += copy;
bytes -= copy;
while (unlikely(!left && bytes)) {
iov++;
buf = iov->iov_base;
copy = min(bytes, iov->iov_len);
left = __copy_to_user_inatomic(buf, from, copy);
copy -= left;
skip = copy;
from += copy;
bytes -= copy;
}
if (likely(!bytes)) {
kunmap_atomic(kaddr);
goto done;
}
offset = from - kaddr;
buf += copy;
kunmap_atomic(kaddr);
copy = min(bytes, iov->iov_len - skip);
}
/* Too bad - revert to non-atomic kmap */
kaddr = kmap(page);
from = kaddr + offset;
left = __copy_to_user(buf, from, copy);
copy -= left;
skip += copy;
from += copy;
bytes -= copy;
while (unlikely(!left && bytes)) {
iov++;
buf = iov->iov_base;
copy = min(bytes, iov->iov_len);
left = __copy_to_user(buf, from, copy);
copy -= left;
skip = copy;
from += copy;
bytes -= copy;
}
kunmap(page);
done:
i->count -= wanted - bytes;
i->nr_segs -= iov - i->iov;
i->iov = iov;
i->iov_offset = skip;
return wanted - bytes;
}
EXPORT_SYMBOL(copy_page_to_iter);
static size_t __iovec_copy_from_user_inatomic(char *vaddr,
const struct iovec *iov, size_t base, size_t bytes)
{
size_t copied = 0, left = 0;
while (bytes) {
char __user *buf = iov->iov_base + base;
int copy = min(bytes, iov->iov_len - base);
base = 0;
left = __copy_from_user_inatomic(vaddr, buf, copy);
copied += copy;
bytes -= copy;
vaddr += copy;
iov++;
if (unlikely(left))
break;
}
return copied - left;
}
/*
* Copy as much as we can into the page and return the number of bytes which
* were successfully copied. If a fault is encountered then return the number of
* bytes which were copied.
*/
size_t iov_iter_copy_from_user_atomic(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes)
{
char *kaddr;
size_t copied;
kaddr = kmap_atomic(page);
if (likely(i->nr_segs == 1)) {
int left;
char __user *buf = i->iov->iov_base + i->iov_offset;
left = __copy_from_user_inatomic(kaddr + offset, buf, bytes);
copied = bytes - left;
} else {
copied = __iovec_copy_from_user_inatomic(kaddr + offset,
i->iov, i->iov_offset, bytes);
}
kunmap_atomic(kaddr);
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user_atomic);
/*
* This has the same sideeffects and return value as
* iov_iter_copy_from_user_atomic().
* The difference is that it attempts to resolve faults.
* Page must not be locked.
*/
size_t iov_iter_copy_from_user(struct page *page,
struct iov_iter *i, unsigned long offset, size_t bytes)
{
char *kaddr;
size_t copied;
kaddr = kmap(page);
if (likely(i->nr_segs == 1)) {
int left;
char __user *buf = i->iov->iov_base + i->iov_offset;
left = __copy_from_user(kaddr + offset, buf, bytes);
copied = bytes - left;
} else {
copied = __iovec_copy_from_user_inatomic(kaddr + offset,
i->iov, i->iov_offset, bytes);
}
kunmap(page);
return copied;
}
EXPORT_SYMBOL(iov_iter_copy_from_user);
void iov_iter_advance(struct iov_iter *i, size_t bytes)
{
BUG_ON(i->count < bytes);
if (likely(i->nr_segs == 1)) {
i->iov_offset += bytes;
i->count -= bytes;
} else {
const struct iovec *iov = i->iov;
size_t base = i->iov_offset;
unsigned long nr_segs = i->nr_segs;
/*
* The !iov->iov_len check ensures we skip over unlikely
* zero-length segments (without overruning the iovec).
*/
while (bytes || unlikely(i->count && !iov->iov_len)) {
int copy;
copy = min(bytes, iov->iov_len - base);
BUG_ON(!i->count || i->count < copy);
i->count -= copy;
bytes -= copy;
base += copy;
if (iov->iov_len == base) {
iov++;
nr_segs--;
base = 0;
}
}
i->iov = iov;
i->iov_offset = base;
i->nr_segs = nr_segs;
}
}
EXPORT_SYMBOL(iov_iter_advance);
/*
* Fault in the first iovec of the given iov_iter, to a maximum length
* of bytes. Returns 0 on success, or non-zero if the memory could not be
* accessed (ie. because it is an invalid address).
*
* writev-intensive code may want this to prefault several iovecs -- that
* would be possible (callers must not rely on the fact that _only_ the
* first iovec will be faulted with the current implementation).
*/
int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes)
{
char __user *buf = i->iov->iov_base + i->iov_offset;
bytes = min(bytes, i->iov->iov_len - i->iov_offset);
return fault_in_pages_readable(buf, bytes);
}
EXPORT_SYMBOL(iov_iter_fault_in_readable);
/*
* Return the count of just the current iov_iter segment.
*/
size_t iov_iter_single_seg_count(const struct iov_iter *i)
{
const struct iovec *iov = i->iov;
if (i->nr_segs == 1)
return i->count;
else
return min(i->count, iov->iov_len - i->iov_offset);
}
EXPORT_SYMBOL(iov_iter_single_seg_count);

246
mm/process_vm_access.c
View File

@ -23,129 +23,44 @@
/**
* process_vm_rw_pages - read/write pages from task specified
* @task: task to read/write from
* @mm: mm for task
* @process_pages: struct pages area that can store at least
* nr_pages_to_copy struct page pointers
* @pa: address of page in task to start copying from/to
* @pages: array of pointers to pages we want to copy
* @start_offset: offset in page to start copying from/to
* @len: number of bytes to copy
* @lvec: iovec array specifying where to copy to/from
* @lvec_cnt: number of elements in iovec array
* @lvec_current: index in iovec array we are up to
* @lvec_offset: offset in bytes from current iovec iov_base we are up to
* @iter: where to copy to/from locally
* @vm_write: 0 means copy from, 1 means copy to
* @nr_pages_to_copy: number of pages to copy
* @bytes_copied: returns number of bytes successfully copied
* Returns 0 on success, error code otherwise
*/
static int process_vm_rw_pages(struct task_struct *task,
struct mm_struct *mm,
struct page **process_pages,
unsigned long pa,
unsigned long start_offset,
unsigned long len,
const struct iovec *lvec,
unsigned long lvec_cnt,
unsigned long *lvec_current,
size_t *lvec_offset,
int vm_write,
unsigned int nr_pages_to_copy,
ssize_t *bytes_copied)
static int process_vm_rw_pages(struct page **pages,
unsigned offset,
size_t len,
struct iov_iter *iter,
int vm_write)
{
int pages_pinned;
void *target_kaddr;
int pgs_copied = 0;
int j;
int ret;
ssize_t bytes_to_copy;
ssize_t rc = 0;
*bytes_copied = 0;
/* Get the pages we're interested in */
down_read(&mm->mmap_sem);
pages_pinned = get_user_pages(task, mm, pa,
nr_pages_to_copy,
vm_write, 0, process_pages, NULL);
up_read(&mm->mmap_sem);
if (pages_pinned != nr_pages_to_copy) {
rc = -EFAULT;
goto end;
}
/* Do the copy for each page */
for (pgs_copied = 0;
(pgs_copied < nr_pages_to_copy) && (*lvec_current < lvec_cnt);
pgs_copied++) {
/* Make sure we have a non zero length iovec */
while (*lvec_current < lvec_cnt
&& lvec[*lvec_current].iov_len == 0)
(*lvec_current)++;
if (*lvec_current == lvec_cnt)
break;
while (len && iov_iter_count(iter)) {
struct page *page = *pages++;
size_t copy = PAGE_SIZE - offset;
size_t copied;
/*
* Will copy smallest of:
* - bytes remaining in page
* - bytes remaining in destination iovec
*/
bytes_to_copy = min_t(ssize_t, PAGE_SIZE - start_offset,
len - *bytes_copied);
bytes_to_copy = min_t(ssize_t, bytes_to_copy,
lvec[*lvec_current].iov_len
- *lvec_offset);
if (copy > len)
copy = len;
target_kaddr = kmap(process_pages[pgs_copied]) + start_offset;
if (vm_write)
ret = copy_from_user(target_kaddr,
lvec[*lvec_current].iov_base
+ *lvec_offset,
bytes_to_copy);
else
ret = copy_to_user(lvec[*lvec_current].iov_base
+ *lvec_offset,
target_kaddr, bytes_to_copy);
kunmap(process_pages[pgs_copied]);
if (ret) {
*bytes_copied += bytes_to_copy - ret;
pgs_copied++;
rc = -EFAULT;
goto end;
}
*bytes_copied += bytes_to_copy;
*lvec_offset += bytes_to_copy;
if (*lvec_offset == lvec[*lvec_current].iov_len) {
/*
* Need to copy remaining part of page into the
* next iovec if there are any bytes left in page
*/
(*lvec_current)++;
*lvec_offset = 0;
start_offset = (start_offset + bytes_to_copy)
% PAGE_SIZE;
if (start_offset)
pgs_copied--;
if (vm_write) {
if (copy > iov_iter_count(iter))
copy = iov_iter_count(iter);
copied = iov_iter_copy_from_user(page, iter,
offset, copy);
iov_iter_advance(iter, copied);
set_page_dirty_lock(page);
} else {
start_offset = 0;
copied = copy_page_to_iter(page, offset, copy, iter);
}
len -= copied;
if (copied < copy && iov_iter_count(iter))
return -EFAULT;
offset = 0;
}
end:
if (vm_write) {
for (j = 0; j < pages_pinned; j++) {
if (j < pgs_copied)
set_page_dirty_lock(process_pages[j]);
put_page(process_pages[j]);
}
} else {
for (j = 0; j < pages_pinned; j++)
put_page(process_pages[j]);
}
return rc;
return 0;
}
/* Maximum number of pages kmalloc'd to hold struct page's during copy */
@ -155,67 +70,60 @@ end:
* process_vm_rw_single_vec - read/write pages from task specified
* @addr: start memory address of target process
* @len: size of area to copy to/from
* @lvec: iovec array specifying where to copy to/from locally
* @lvec_cnt: number of elements in iovec array
* @lvec_current: index in iovec array we are up to
* @lvec_offset: offset in bytes from current iovec iov_base we are up to
* @iter: where to copy to/from locally
* @process_pages: struct pages area that can store at least
* nr_pages_to_copy struct page pointers
* @mm: mm for task
* @task: task to read/write from
* @vm_write: 0 means copy from, 1 means copy to
* @bytes_copied: returns number of bytes successfully copied
* Returns 0 on success or on failure error code
*/
static int process_vm_rw_single_vec(unsigned long addr,
unsigned long len,
const struct iovec *lvec,
unsigned long lvec_cnt,
unsigned long *lvec_current,
size_t *lvec_offset,
struct iov_iter *iter,
struct page **process_pages,
struct mm_struct *mm,
struct task_struct *task,
int vm_write,
ssize_t *bytes_copied)
int vm_write)
{
unsigned long pa = addr & PAGE_MASK;
unsigned long start_offset = addr - pa;
unsigned long nr_pages;
ssize_t bytes_copied_loop;
ssize_t rc = 0;
unsigned long nr_pages_copied = 0;
unsigned long nr_pages_to_copy;
unsigned long max_pages_per_loop = PVM_MAX_KMALLOC_PAGES
/ sizeof(struct pages *);
*bytes_copied = 0;
/* Work out address and page range required */
if (len == 0)
return 0;
nr_pages = (addr + len - 1) / PAGE_SIZE - addr / PAGE_SIZE + 1;
while ((nr_pages_copied < nr_pages) && (*lvec_current < lvec_cnt)) {
nr_pages_to_copy = min(nr_pages - nr_pages_copied,
max_pages_per_loop);
while (!rc && nr_pages && iov_iter_count(iter)) {
int pages = min(nr_pages, max_pages_per_loop);
size_t bytes;
rc = process_vm_rw_pages(task, mm, process_pages, pa,
start_offset, len,
lvec, lvec_cnt,
lvec_current, lvec_offset,
vm_write, nr_pages_to_copy,
&bytes_copied_loop);
/* Get the pages we're interested in */
down_read(&mm->mmap_sem);
pages = get_user_pages(task, mm, pa, pages,
vm_write, 0, process_pages, NULL);
up_read(&mm->mmap_sem);
if (pages <= 0)
return -EFAULT;
bytes = pages * PAGE_SIZE - start_offset;
if (bytes > len)
bytes = len;
rc = process_vm_rw_pages(process_pages,
start_offset, bytes, iter,
vm_write);
len -= bytes;
start_offset = 0;
*bytes_copied += bytes_copied_loop;
if (rc < 0) {
return rc;
} else {
len -= bytes_copied_loop;
nr_pages_copied += nr_pages_to_copy;
pa += nr_pages_to_copy * PAGE_SIZE;
}
nr_pages -= pages;
pa += pages * PAGE_SIZE;
while (pages)
put_page(process_pages[--pages]);
}
return rc;
@ -228,8 +136,7 @@ static int process_vm_rw_single_vec(unsigned long addr,
/**
* process_vm_rw_core - core of reading/writing pages from task specified
* @pid: PID of process to read/write from/to
* @lvec: iovec array specifying where to copy to/from locally
* @liovcnt: size of lvec array
* @iter: where to copy to/from locally
* @rvec: iovec array specifying where to copy to/from in the other process
* @riovcnt: size of rvec array
* @flags: currently unused
@ -238,8 +145,7 @@ static int process_vm_rw_single_vec(unsigned long addr,
* return less bytes than expected if an error occurs during the copying
* process.
*/
static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec,
unsigned long liovcnt,
static ssize_t process_vm_rw_core(pid_t pid, struct iov_iter *iter,
const struct iovec *rvec,
unsigned long riovcnt,
unsigned long flags, int vm_write)
@ -250,13 +156,10 @@ static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec,
struct mm_struct *mm;
unsigned long i;
ssize_t rc = 0;
ssize_t bytes_copied_loop;
ssize_t bytes_copied = 0;
unsigned long nr_pages = 0;
unsigned long nr_pages_iov;
unsigned long iov_l_curr_idx = 0;
size_t iov_l_curr_offset = 0;
ssize_t iov_len;
size_t total_len = iov_iter_count(iter);
/*
* Work out how many pages of struct pages we're going to need
@ -310,24 +213,20 @@ static ssize_t process_vm_rw_core(pid_t pid, const struct iovec *lvec,
goto put_task_struct;
}
for (i = 0; i < riovcnt && iov_l_curr_idx < liovcnt; i++) {
for (i = 0; i < riovcnt && iov_iter_count(iter) && !rc; i++)
rc = process_vm_rw_single_vec(
(unsigned long)rvec[i].iov_base, rvec[i].iov_len,
lvec, liovcnt, &iov_l_curr_idx, &iov_l_curr_offset,
process_pages, mm, task, vm_write, &bytes_copied_loop);
bytes_copied += bytes_copied_loop;
if (rc != 0) {
/* If we have managed to copy any data at all then
we return the number of bytes copied. Otherwise
we return the error code */
if (bytes_copied)
rc = bytes_copied;
goto put_mm;
}
}
iter, process_pages, mm, task, vm_write);
/* copied = space before - space after */
total_len -= iov_iter_count(iter);
/* If we have managed to copy any data at all then
we return the number of bytes copied. Otherwise
we return the error code */
if (total_len)
rc = total_len;
rc = bytes_copied;
put_mm:
mmput(mm);
put_task_struct:
@ -363,6 +262,7 @@ static ssize_t process_vm_rw(pid_t pid,
struct iovec iovstack_r[UIO_FASTIOV];
struct iovec *iov_l = iovstack_l;
struct iovec *iov_r = iovstack_r;
struct iov_iter iter;
ssize_t rc;
if (flags != 0)
@ -378,13 +278,14 @@ static ssize_t process_vm_rw(pid_t pid,
if (rc <= 0)
goto free_iovecs;
iov_iter_init(&iter, iov_l, liovcnt, rc, 0);
rc = rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt, UIO_FASTIOV,
iovstack_r, &iov_r);
if (rc <= 0)
goto free_iovecs;
rc = process_vm_rw_core(pid, iov_l, liovcnt, iov_r, riovcnt, flags,
vm_write);
rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write);
free_iovecs:
if (iov_r != iovstack_r)
@ -424,6 +325,7 @@ compat_process_vm_rw(compat_pid_t pid,
struct iovec iovstack_r[UIO_FASTIOV];
struct iovec *iov_l = iovstack_l;
struct iovec *iov_r = iovstack_r;
struct iov_iter iter;
ssize_t rc = -EFAULT;
if (flags != 0)
@ -439,14 +341,14 @@ compat_process_vm_rw(compat_pid_t pid,
&iov_l);
if (rc <= 0)
goto free_iovecs;
iov_iter_init(&iter, iov_l, liovcnt, rc, 0);
rc = compat_rw_copy_check_uvector(CHECK_IOVEC_ONLY, rvec, riovcnt,
UIO_FASTIOV, iovstack_r,
&iov_r);
if (rc <= 0)
goto free_iovecs;
rc = process_vm_rw_core(pid, iov_l, liovcnt, iov_r, riovcnt, flags,
vm_write);
rc = process_vm_rw_core(pid, &iter, iov_r, riovcnt, flags, vm_write);
free_iovecs:
if (iov_r != iovstack_r)

79
mm/shmem.c
View File

@ -1402,13 +1402,25 @@ shmem_write_end(struct file *file, struct address_space *mapping,
return copied;
}
static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_t *desc, read_actor_t actor)
static ssize_t shmem_file_aio_read(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs, loff_t pos)
{
struct inode *inode = file_inode(filp);
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct address_space *mapping = inode->i_mapping;
pgoff_t index;
unsigned long offset;
enum sgp_type sgp = SGP_READ;
int error;
ssize_t retval;
size_t count;
loff_t *ppos = &iocb->ki_pos;
struct iov_iter iter;
retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
if (retval)
return retval;
iov_iter_init(&iter, iov, nr_segs, count, 0);
/*
* Might this read be for a stacking filesystem? Then when reading
@ -1436,10 +1448,10 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
break;
}
desc->error = shmem_getpage(inode, index, &page, sgp, NULL);
if (desc->error) {
if (desc->error == -EINVAL)
desc->error = 0;
error = shmem_getpage(inode, index, &page, sgp, NULL);
if (error) {
if (error == -EINVAL)
error = 0;
break;
}
if (page)
@ -1483,61 +1495,26 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
/*
* Ok, we have the page, and it's up-to-date, so
* now we can copy it to user space...
*
* The actor routine returns how many bytes were actually used..
* NOTE! This may not be the same as how much of a user buffer
* we filled up (we may be padding etc), so we can only update
* "pos" here (the actor routine has to update the user buffer
* pointers and the remaining count).
*/
ret = actor(desc, page, offset, nr);
ret = copy_page_to_iter(page, offset, nr, &iter);
retval += ret;
offset += ret;
index += offset >> PAGE_CACHE_SHIFT;
offset &= ~PAGE_CACHE_MASK;
page_cache_release(page);
if (ret != nr || !desc->count)
if (!iov_iter_count(&iter))
break;
if (ret < nr) {
error = -EFAULT;
break;
}
cond_resched();
}
*ppos = ((loff_t) index << PAGE_CACHE_SHIFT) + offset;
file_accessed(filp);
}
static ssize_t shmem_file_aio_read(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs, loff_t pos)
{
struct file *filp = iocb->ki_filp;
ssize_t retval;
unsigned long seg;
size_t count;
loff_t *ppos = &iocb->ki_pos;
retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
if (retval)
return retval;
for (seg = 0; seg < nr_segs; seg++) {
read_descriptor_t desc;
desc.written = 0;
desc.arg.buf = iov[seg].iov_base;
desc.count = iov[seg].iov_len;
if (desc.count == 0)
continue;
desc.error = 0;
do_shmem_file_read(filp, ppos, &desc, file_read_actor);
retval += desc.written;
if (desc.error) {
retval = retval ?: desc.error;
break;
}
if (desc.count > 0)
break;
}
return retval;
file_accessed(file);
return retval ? retval : error;
}
static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos,
@ -1576,7 +1553,7 @@ static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos,
index = *ppos >> PAGE_CACHE_SHIFT;
loff = *ppos & ~PAGE_CACHE_MASK;
req_pages = (len + loff + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
nr_pages = min(req_pages, pipe->buffers);
nr_pages = min(req_pages, spd.nr_pages_max);
spd.nr_pages = find_get_pages_contig(mapping, index,
nr_pages, spd.pages);

2
security/integrity/evm/evm_crypto.c
View File

@ -139,7 +139,7 @@ static int evm_calc_hmac_or_hash(struct dentry *dentry,
int error;
int size;
if (!inode->i_op || !inode->i_op->getxattr)
if (!inode->i_op->getxattr)
return -EOPNOTSUPP;
desc = init_desc(type);
if (IS_ERR(desc))

2
security/integrity/evm/evm_main.c
View File

@ -64,7 +64,7 @@ static int evm_find_protected_xattrs(struct dentry *dentry)
int error;
int count = 0;
if (!inode->i_op || !inode->i_op->getxattr)
if (!inode->i_op->getxattr)
return -EOPNOTSUPP;
for (xattr = evm_config_xattrnames; *xattr != NULL; xattr++) {

4
security/tomoyo/realpath.c
View File

@ -173,7 +173,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
* Use filesystem name if filesystem does not support rename()
* operation.
*/
if (inode->i_op && !inode->i_op->rename)
if (!inode->i_op->rename)
goto prepend_filesystem_name;
}
/* Prepend device name. */
@ -282,7 +282,7 @@ char *tomoyo_realpath_from_path(struct path *path)
* Get local name for filesystems without rename() operation
* or dentry without vfsmount.
*/
if (!path->mnt || (inode->i_op && !inode->i_op->rename))
if (!path->mnt || !inode->i_op->rename)
pos = tomoyo_get_local_path(path->dentry, buf,
buf_len - 1);
/* Get absolute name for the rest. */