diff options
| author | Jan Kara <jack@suse.com> | 2015-12-07 15:10:26 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-12-07 15:10:26 -0500 |
| commit | c86d8db33a922da808a5560aa15ed663a9569b37 (patch) | |
| tree | 64ee357906cb5d2a0408a9613532460e49b7b6c9 /fs/ext4/ext4.h | |
| parent | 53085fac02d12fcd29a9cb074ec480ff0f77ae5c (diff) | |
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/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index ffc6ab000c78..ae900b530d37 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -557,6 +557,10 @@ enum { #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080 /* Convert written extents to unwritten */ #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100 + /* Write zeros to newly created written extents */ +#define EXT4_GET_BLOCKS_ZERO 0x0200 +#define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\ + EXT4_GET_BLOCKS_ZERO) /* * The bit position of these flags must not overlap with any of the |