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fs: remove _submit_bh() 

_submit_bh() allowed submitting a buffer_head for I/O using custom
bio_flags.  It used to be used by jbd to set BIO_SNAP_STABLE, introduced
by commit 7136851117 ("mm: make snapshotting pages for stable writes a
per-bio operation").  However, the code and flag has since been removed
and no _submit_bh() users remain.

These days, bio_flags are mostly used internally by the block layer to
track the state of bio's.  As such, it doesn't really make sense for
filesystems to use them instead of op_flags when wanting special
behavior for block requests.

Therefore, remove _submit_bh() and trim the bio_flags argument from
submit_bh_wbc().

Cc: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Eric Biggers 2017-03-25 21:02:18 -07:00 committed by Al Viro
parent cda37124f4
commit 020c2833db
2 changed files with 5 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
fs/buffer.c
View File

@ -49,7 +49,6 @@
static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags,
struct writeback_control *wbc);
#define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)
@ -1830,7 +1829,7 @@ int __block_write_full_page(struct inode *inode, struct page *page,
do {
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, wbc);
nr_underway++;
}
bh = next;
@ -1884,7 +1883,7 @@ recover:
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
clear_buffer_dirty(bh);
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc);
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, wbc);
nr_underway++;
}
bh = next;
@ -3095,7 +3094,7 @@ void guard_bio_eod(int op, struct bio *bio)
}
static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags, struct writeback_control *wbc)
struct writeback_control *wbc)
{
struct bio *bio;
@ -3130,7 +3129,6 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
bio->bi_end_io = end_bio_bh_io_sync;
bio->bi_private = bh;
bio->bi_flags |= bio_flags;
/* Take care of bh's that straddle the end of the device */
guard_bio_eod(op, bio);
@ -3145,16 +3143,9 @@ static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
return 0;
}
int _submit_bh(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags)
int submit_bh(int op, int op_flags, struct buffer_head *bh)
{
return submit_bh_wbc(op, op_flags, bh, bio_flags, NULL);
}
EXPORT_SYMBOL_GPL(_submit_bh);
int submit_bh(int op, int op_flags, struct buffer_head *bh)
{
return submit_bh_wbc(op, op_flags, bh, 0, NULL);
return submit_bh_wbc(op, op_flags, bh, NULL);
}
EXPORT_SYMBOL(submit_bh);

2
include/linux/buffer_head.h
View File

@ -196,8 +196,6 @@ void ll_rw_block(int, int, int, struct buffer_head * bh[]);
int sync_dirty_buffer(struct buffer_head *bh);
int __sync_dirty_buffer(struct buffer_head *bh, int op_flags);
void write_dirty_buffer(struct buffer_head *bh, int op_flags);
int _submit_bh(int op, int op_flags, struct buffer_head *bh,
unsigned long bio_flags);
int submit_bh(int, int, struct buffer_head *);
void write_boundary_block(struct block_device *bdev,
sector_t bblock, unsigned blocksize);