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ext4: fix the length returned by fiemap for an unallocated extent

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If the file's blocks have not yet been allocated because of delayed
allocation, the length of the extent returned by fiemap is incorrect.
This commit fixes this bug.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-05-02 19:05:37 -04:00
parent c9877b205f
commit eefd7f03b8
1 changed files with 8 additions and 1 deletions
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9
fs/ext4/extents.c
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@ -3244,8 +3244,15 @@ static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
* XXX this might miss a single-block extent at EXT_MAX_BLOCK
*/
if (ext4_ext_next_allocated_block(path) == EXT_MAX_BLOCK ||
newex->ec_block + newex->ec_len - 1 == EXT_MAX_BLOCK)
newex->ec_block + newex->ec_len - 1 == EXT_MAX_BLOCK) {
loff_t size = i_size_read(inode);
loff_t bs = EXT4_BLOCK_SIZE(inode->i_sb);
flags |= FIEMAP_EXTENT_LAST;
if ((flags & FIEMAP_EXTENT_DELALLOC) &&
logical+length > size)
length = (size - logical + bs - 1) & ~(bs-1);
}
error = fiemap_fill_next_extent(fieinfo, logical, physical,
length, flags);