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| author | Jan Kara | 2015-12-07 21:10:26 +0100 |
|---|---|---|
| committer | Theodore Ts'o | 2015-12-07 21:10:26 +0100 |
| commit | c86d8db33a922da808a5560aa15ed663a9569b37 (patch) | |
| tree | 64ee357906cb5d2a0408a9613532460e49b7b6c9 /fs/ext4/extents.c | |
| parent | ext4: provide ext4_issue_zeroout() (diff) | |
| download | kernel-qcow2-linux-c86d8db33a922da808a5560aa15ed663a9569b37.tar.gz kernel-qcow2-linux-c86d8db33a922da808a5560aa15ed663a9569b37.tar.xz kernel-qcow2-linux-c86d8db33a922da808a5560aa15ed663a9569b37.zip | |
ext4: implement allocation of pre-zeroed blocks
DAX page fault path needs to get blocks that are pre-zeroed to avoid
races when two concurrent page faults happen in the same block of a
file. Implement support for this in ext4_map_blocks().
Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 867e98b6bc6c..b52fea3b7219 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4044,6 +4044,14 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode, } /* IO end_io complete, convert the filled extent to written */ if (flags & EXT4_GET_BLOCKS_CONVERT) { + if (flags & EXT4_GET_BLOCKS_ZERO) { + if (allocated > map->m_len) + allocated = map->m_len; + err = ext4_issue_zeroout(inode, map->m_lblk, newblock, + allocated); + if (err < 0) + goto out2; + } ret = ext4_convert_unwritten_extents_endio(handle, inode, map, ppath); if (ret >= 0) { |