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f2fs: reduce covered region of sbi->cp_rwsem in f2fs_map_blocks

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Only cover sbi->cp_rwsem on one dnode page's allocation and modification
instead of multiple's in f2fs_map_blocks, it can reduce the covered region
of cp_rwsem, then we can avoid potential long time delay for concurrent
checkpointer.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2015-12-23 17:11:43 +08:00 committed by Jaegeuk Kim
parent 93bae099ea
commit 3104af35eb
1 changed files with 7 additions and 2 deletions
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9
fs/f2fs/data.c
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@ -590,7 +590,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
}
if (create)
f2fs_lock_op(F2FS_I_SB(inode));
f2fs_lock_op(sbi);
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
@ -647,6 +647,11 @@ get_next:
allocated = false;
f2fs_put_dnode(&dn);
if (create) {
f2fs_unlock_op(sbi);
f2fs_lock_op(sbi);
}
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, pgofs, mode);
if (err) {
@ -702,7 +707,7 @@ put_out:
f2fs_put_dnode(&dn);
unlock_out:
if (create)
f2fs_unlock_op(F2FS_I_SB(inode));
f2fs_unlock_op(sbi);
out:
trace_f2fs_map_blocks(inode, map, err);
return err;