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get rid of DEBUG_WRITECOUNT

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it only makes control flow in __fput() and friends more convoluted.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-03-14 10:06:32 -04:00
parent dd20908a8a
commit 4597e695b8
10 changed files with 0 additions and 78 deletions
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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
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@ -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
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@ -550,7 +550,6 @@ 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
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@ -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
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@ -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
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@ -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

5
fs/file_table.c
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@ -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);
}
@ -186,7 +185,6 @@ struct file *alloc_file(struct path *path, fmode_t mode,
* 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)
@ -213,10 +211,7 @@ static void drop_file_write_access(struct file *file)
return;
put_write_access(inode);
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

8
fs/open.c
View File

@ -683,7 +683,6 @@ static int do_dentry_open(struct file *f,
error = __get_file_write_access(inode, f->f_path.mnt);
if (error)
goto cleanup_file;
file_take_write(f);
}
f->f_mapping = inode->i_mapping;
@ -731,14 +730,7 @@ static int do_dentry_open(struct file *f,
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE) {
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.
*/
put_write_access(inode);
file_reset_write(f);
__mnt_drop_write(f->f_path.mnt);
}
}

49
include/linux/fs.h
View File

@ -769,9 +769,6 @@ 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;
@ -809,9 +806,6 @@ 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 {
@ -829,49 +823,6 @@ 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

10
lib/Kconfig.debug
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@ -1030,16 +1030,6 @@ 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