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xfs: create a separate cow extent size hint for the allocator

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Create a per-inode extent size allocator hint for copy-on-write.  This
hint is separate from the existing extent size hint so that CoW can
take advantage of the fragmentation-reducing properties of extent size
hints without disabling delalloc for regular writes.

The extent size hint that's fed to the allocator during a copy on
write operation is the greater of the cowextsize and regular extsize
hint.

During reflink, if we're sharing the entire source file to the entire
destination file and the destination file doesn't already have a
cowextsize hint, propagate the source file's cowextsize hint to the
destination file.

Furthermore, zero the bulkstat buffer prior to setting the fields
so that we don't copy kernel memory contents into userspace.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:43 -07:00
parent 98cc2db5b8
commit f7ca352272
15 changed files with 167 additions and 20 deletions
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9
fs/xfs/xfs_bmap_util.c
View file

@ -582,8 +582,13 @@ xfs_getbmap(
if (ip->i_cformat != XFS_DINODE_FMT_EXTENTS)
return -EINVAL;
prealloced = 0;
fixlen = XFS_ISIZE(ip);
if (xfs_get_cowextsz_hint(ip)) {
prealloced = 1;
fixlen = mp->m_super->s_maxbytes;
} else {
prealloced = 0;
fixlen = XFS_ISIZE(ip);
}
break;
default:
if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&