summaryrefslogtreecommitdiff
path: root/fs/xfs/linux-2.6/xfs_buf.h
diff options
context:
space:
mode:
authorTao Ma <tao.ma@oracle.com>2010-08-30 02:44:03 +0000
committerAlex Elder <aelder@sgi.com>2010-09-03 09:02:11 -0500
commit9af25465081480a75824fd7a16a37a5cfebeede9 (patch)
tree475ea0ef9247b65b0ce8997ba581a87bd71c11b6 /fs/xfs/linux-2.6/xfs_buf.h
parent23963e54ce187ca6e907c83176c15508b0f6e60d (diff)
xfs: Make fiemap work with sparse files
In xfs_vn_fiemap, we set bvm_count to fi_extent_max + 1 and want to return fi_extent_max extents, but actually it won't work for a sparse file. The reason is that in xfs_getbmap we will calculate holes and set it in 'out', while out is malloced by bmv_count(fi_extent_max+1) which didn't consider holes. So in the worst case, if 'out' vector looks like [hole, extent, hole, extent, hole, ... hole, extent, hole], we will only return half of fi_extent_max extents. This patch add a new parameter BMV_IF_NO_HOLES for bvm_iflags. So with this flags, we don't use our 'out' in xfs_getbmap for a hole. The solution is a bit ugly by just don't increasing index of 'out' vector. I felt that it is not easy to skip it at the very beginning since we have the complicated check and some function like xfs_getbmapx_fix_eof_hole to adjust 'out'. Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.h')
0 files changed, 0 insertions, 0 deletions