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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2019-10-18 16:44:10 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-10-21 08:51:59 -0700
commitc039b99792726346ad46ff17c5a5bcb77a5edac4 (patch)
treee9034adc21c6fc3ad6fc775e8f3225e35b015d50 /fs/gfs2/bmap.c
parenteb81cf9d0e18d438e27339e0d1a49d3ac8644674 (diff)
iomap: use a srcmap for a read-modify-write I/O
The srcmap is used to identify where the read is to be performed from. It is passed to ->iomap_begin, which can fill it in if we need to read data for partially written blocks from a different location than the write target. The srcmap is only supported for buffered writes so far. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> [hch: merged two patches, removed the IOMAP_F_COW flag, use iomap as srcmap if not set, adjust length down to srcmap end as well] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Acked-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Diffstat (limited to 'fs/gfs2/bmap.c')
-rw-r--r--fs/gfs2/bmap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index f63df54a08c6..516103248272 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1149,7 +1149,8 @@ static inline bool gfs2_iomap_need_write_lock(unsigned flags)
}
static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
- unsigned flags, struct iomap *iomap)
+ unsigned flags, struct iomap *iomap,
+ struct iomap *srcmap)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct metapath mp = { .mp_aheight = 1, };