[PATCH 5/6] iomap: don't set FIEMAP_EXTENT_MERGED for extent based filesystems
"Darrick J. Wong" <[email protected]>
| Newsgroups | gmane.comp.file-systems.xfs.general |
|---|---|
| Message-ID | <147216787356.525.16980820316846690768.stgit__20224.3550600999$1472167901$gmane$org@birch.djwong.org> |
From: Christoph Hellwig <[email protected]> Filesystems like XFS that use extents should not set the FIEMAP_EXTENT_MERGED flag in the fiemap extent structures. To allow for both behaviors for the upcoming gfs2 usage split the iomap type field into type and flags, and only set FIEMAP_EXTENT_MERGED if the IOMAP_F_MERGED flag is set. The flags field will also come in handy for future features such as shared extents on reflink-enabled file systems. Reported-by: Andreas Gruenbacher <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> --- fs/iomap.c | 5 ++++- include/linux/iomap.h | 8 +++++++- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/iomap.c b/fs/iomap.c index 7b295d5..e9b3f99 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -510,9 +510,12 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi, break; } + if (iomap->flags & IOMAP_F_MERGED) + flags |= FIEMAP_EXTENT_MERGED; + return fiemap_fill_next_extent(fi, iomap->offset, iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0, - iomap->length, flags | FIEMAP_EXTENT_MERGED); + iomap->length, flags); } diff --git a/include/linux/iomap.h b/include/linux/iomap.h index b2e30e5..3a56212 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -19,6 +19,11 @@ struct vm_fault; #define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */ /* + * Flags for iomap mappings: + */ +#define IOMAP_F_MERGED 0x01 /* contains multiple blocks/extents */ + +/* * Magic value for blkno: */ #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */ @@ -27,7 +32,8 @@ struct iomap { sector_t blkno; /* 1st sector of mapping, 512b units */ loff_t offset; /* file offset of mapping, bytes */ u64 length; /* length of mapping, bytes */ - int type; /* type of mapping */ + u16 type; /* type of mapping */ + u16 flags; /* flags for mapping */ struct block_device *bdev; /* block device for I/O */ }; _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs