diff options
| author | Jan Kara <jack@suse.cz> | 2016-03-09 22:54:00 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-03-09 22:54:00 -0500 |
| commit | facab4d9711e7aa3532cb82643803e8f1b9518e8 (patch) | |
| tree | 5c0f800db5aeb1fca6842c81cd3821ae847fcc0d /fs/ext4/extents.c | |
| parent | 140a52508a68387e22486659ff9eaa89a24f6e40 (diff) | |
| download | linux-facab4d9711e7aa3532cb82643803e8f1b9518e8.tar.gz | |
ext4: return hole from ext4_map_blocks()
Currently, ext4_map_blocks() just returns 0 when it finds a hole and
allocation is not requested. However we have all the information
available to tell how large the hole actually is and there are callers
of ext4_map_blocks() which would save some block-by-block hole iteration
if they knew this information. So fill in struct ext4_map_blocks even
for holes with the information we have. We keep returning 0 for holes to
maintain backward compatibility of the function.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 7858fc1d2501a..2730039d47428 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4374,13 +4374,20 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { ext4_lblk_t hole_start, hole_len; + hole_start = map->m_lblk; + hole_len = ext4_ext_determine_hole(inode, path, &hole_start); /* * put just found gap into cache to speed up * subsequent requests */ - hole_start = map->m_lblk; - hole_len = ext4_ext_determine_hole(inode, path, &hole_start); ext4_ext_put_gap_in_cache(inode, hole_start, hole_len); + + /* Update hole_len to reflect hole size after map->m_lblk */ + if (hole_start != map->m_lblk) + hole_len -= map->m_lblk - hole_start; + map->m_pblk = 0; + map->m_len = min_t(unsigned int, map->m_len, hole_len); + goto out2; } |