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| author | Oleg Nesterov <oleg@redhat.com> | 2015-07-19 23:48:20 +0200 |
|---|---|---|
| committer | Oleg Nesterov <oleg@redhat.com> | 2015-08-15 13:52:08 +0200 |
| commit | bee9182d955227f01ff3b80c4cb6acca9bb40b11 (patch) | |
| tree | 3237b122991b6f44913f47561e52c344d7725fb1 /include/linux/fs.h | |
| parent | 45e38cff4fce8d6871b5fa5e734e4dc9814d6056 (diff) | |
| download | lwn-bee9182d955227f01ff3b80c4cb6acca9bb40b11.tar.gz lwn-bee9182d955227f01ff3b80c4cb6acca9bb40b11.zip | |
introduce __sb_writers_{acquired,release}() helpers
Preparation to hide the sb->s_writers internals from xfs and btrfs.
Add 2 trivial define's they can use rather than play with ->s_writers
directly. No changes in btrfs/transaction.o and xfs/xfs_aops.o.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Jan Kara <jack@suse.com>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 84b783f277f7..acb7cad84edd 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1391,6 +1391,11 @@ extern struct timespec current_fs_time(struct super_block *sb); void __sb_end_write(struct super_block *sb, int level); int __sb_start_write(struct super_block *sb, int level, bool wait); +#define __sb_writers_acquired(sb, lev) \ + rwsem_acquire_read(&(sb)->s_writers.lock_map[(lev)-1], 0, 1, _THIS_IP_) +#define __sb_writers_release(sb, lev) \ + rwsem_release(&(sb)->s_writers.lock_map[(lev)-1], 1, _THIS_IP_) + /** * sb_end_write - drop write access to a superblock * @sb: the super we wrote to |