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| author | Matthew Wilcox <willy@linux.intel.com> | 2015-09-08 23:59:20 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-09 00:35:28 +0200 |
| commit | ed923b5776a2d2e949bd5b20f3956d68f3c826b7 (patch) | |
| tree | b3d101eb5cbeedc8ed057a2e70ff3ce30a165cbb /fs/ext4/inode.c | |
| parent | dax: improve comment about truncate race (diff) | |
| download | linux-ed923b5776a2d2e949bd5b20f3956d68f3c826b7.tar.xz linux-ed923b5776a2d2e949bd5b20f3956d68f3c826b7.zip | |
ext4: add ext4_get_block_dax()
DAX wants different semantics from any currently-existing ext4 get_block
callback. Unlike ext4_get_block_write(), it needs to honour the
'create' flag, and unlike ext4_get_block(), it needs to be able to
return unwritten extents. So introduce a new ext4_get_block_dax() which
has those semantics.
We could also change ext4_get_block_write() to honour the 'create' flag,
but that might have consequences on other users that I do not currently
understand.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5ebcc7683a5c..612fbcf76b5c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -3021,6 +3021,17 @@ static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock, EXT4_GET_BLOCKS_NO_LOCK); } +int ext4_get_block_dax(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int flags = EXT4_GET_BLOCKS_PRE_IO | EXT4_GET_BLOCKS_UNWRIT_EXT; + if (create) + flags |= EXT4_GET_BLOCKS_CREATE; + ext4_debug("ext4_get_block_dax: inode %lu, create flag %d\n", + inode->i_ino, create); + return _ext4_get_block(inode, iblock, bh_result, flags); +} + static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset, ssize_t size, void *private) { |