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btrfs: use cached_state for btrfs_check_nocow_lock 

Now that try_lock_extent() takes a cached_state, plumb the cached_state
through btrfs_try_lock_ordered_range() and then use a cached_state in
btrfs_check_nocow_lock everywhere to avoid extra tree searches on the
extent_io_tree.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-09-30 16:45:10 -04:00 committed by David Sterba
parent 83ae4133ac
commit 632ddfa213
3 changed files with 12 additions and 7 deletions
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9
fs/btrfs/file.c
View File

@ -1373,6 +1373,7 @@ int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct btrfs_root *root = inode->root;
struct extent_state *cached_state = NULL;
u64 lockstart, lockend;
u64 num_bytes;
int ret;
@ -1389,12 +1390,14 @@ int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
num_bytes = lockend - lockstart + 1;
if (nowait) {
if (!btrfs_try_lock_ordered_range(inode, lockstart, lockend)) {
if (!btrfs_try_lock_ordered_range(inode, lockstart, lockend,
&cached_state)) {
btrfs_drew_write_unlock(&root->snapshot_lock);
return -EAGAIN;
}
} else {
btrfs_lock_and_flush_ordered_range(inode, lockstart, lockend, NULL);
btrfs_lock_and_flush_ordered_range(inode, lockstart, lockend,
&cached_state);
}
ret = can_nocow_extent(&inode->vfs_inode, lockstart, &num_bytes,
NULL, NULL, NULL, nowait, false);
@ -1403,7 +1406,7 @@ int btrfs_check_nocow_lock(struct btrfs_inode *inode, loff_t pos,
else
*write_bytes = min_t(size_t, *write_bytes ,
num_bytes - pos + lockstart);
unlock_extent(&inode->io_tree, lockstart, lockend, NULL);
unlock_extent(&inode->io_tree, lockstart, lockend, &cached_state);
return ret;
}

7
fs/btrfs/ordered-data.c
View File

@ -1069,11 +1069,12 @@ void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
* Return true if btrfs_lock_ordered_range does not return any extents,
* otherwise false.
*/
bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end)
bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end,
struct extent_state **cached_state)
{
struct btrfs_ordered_extent *ordered;
if (!try_lock_extent(&inode->io_tree, start, end, NULL))
if (!try_lock_extent(&inode->io_tree, start, end, cached_state))
return false;
ordered = btrfs_lookup_ordered_range(inode, start, end - start + 1);
@ -1081,7 +1082,7 @@ bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end)
return true;
btrfs_put_ordered_extent(ordered);
unlock_extent(&inode->io_tree, start, end, NULL);
unlock_extent(&inode->io_tree, start, end, cached_state);
return false;
}

3
fs/btrfs/ordered-data.h
View File

@ -206,7 +206,8 @@ void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
u64 end,
struct extent_state **cached_state);
bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end);
bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end,
struct extent_state **cached_state);
int btrfs_split_ordered_extent(struct btrfs_ordered_extent *ordered, u64 pre,
u64 post);
int __init ordered_data_init(void);