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ext4: only zero partial blocks in ext4_zero_partial_blocks() 

Currently if we pass range into ext4_zero_partial_blocks() which covers
entire block we would attempt to zero it even though we should only zero
unaligned part of the block.

Fix this by checking whether the range covers the whole block skip
zeroing if so.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Lukas Czerner 2013-07-01 08:12:39 -04:00 committed by Theodore Ts'o
parent 42c832debb
commit e1be3a928e
1 changed files with 10 additions and 7 deletions
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17
fs/ext4/inode.c
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@ -3424,33 +3424,36 @@ int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
{
struct super_block *sb = inode->i_sb;
struct address_space *mapping = inode->i_mapping;
unsigned partial = lstart & (sb->s_blocksize - 1);
unsigned partial_start, partial_end;
ext4_fsblk_t start, end;
loff_t byte_end = (lstart + length - 1);
int err = 0;
partial_start = lstart & (sb->s_blocksize - 1);
partial_end = byte_end & (sb->s_blocksize - 1);
start = lstart >> sb->s_blocksize_bits;
end = byte_end >> sb->s_blocksize_bits;
/* Handle partial zero within the single block */
if (start == end) {
if (start == end &&
(partial_start || (partial_end != sb->s_blocksize - 1))) {
err = ext4_block_zero_page_range(handle, mapping,
lstart, length);
return err;
}
/* Handle partial zero out on the start of the range */
if (partial) {
if (partial_start) {
err = ext4_block_zero_page_range(handle, mapping,
lstart, sb->s_blocksize);
if (err)
return err;
}
/* Handle partial zero out on the end of the range */
partial = byte_end & (sb->s_blocksize - 1);
if (partial != sb->s_blocksize - 1)
if (partial_end != sb->s_blocksize - 1)
err = ext4_block_zero_page_range(handle, mapping,
byte_end - partial,
partial + 1);
byte_end - partial_end,
partial_end + 1);
return err;
}