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authorJan Kara <jack@suse.com>2015-12-07 15:10:26 -0500
committerTheodore Ts'o <tytso@mit.edu>2015-12-07 15:10:26 -0500
commitc86d8db33a922da808a5560aa15ed663a9569b37 (patch)
tree64ee357906cb5d2a0408a9613532460e49b7b6c9 /fs/ext4/ext4.h
parent53085fac02d12fcd29a9cb074ec480ff0f77ae5c (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.h4
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