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xfs: reflink should break pnfs leases before sharing blocks

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Before we share blocks between files, we need to break the pnfs leases
on the layout before we start slicing and dicing the block map.  The
structure of this function sets us up for the lock contention reduction
in the next patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2018-01-18 13:55:20 -08:00
parent c47b74fb2d
commit 1364b1d4b5
1 changed files with 47 additions and 1 deletions
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48
fs/xfs/xfs_reflink.c
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@ -1244,6 +1244,50 @@ err:
return error;
}
/*
* Grab the exclusive iolock for a data copy from src to dest, making
* sure to abide vfs locking order (lowest pointer value goes first) and
* breaking the pnfs layout leases on dest before proceeding. The loop
* is needed because we cannot call the blocking break_layout() with the
* src iolock held, and therefore have to back out both locks.
*/
static int
xfs_iolock_two_inodes_and_break_layout(
struct inode *src,
struct inode *dest)
{
int error;
retry:
if (src < dest) {
inode_lock(src);
inode_lock_nested(dest, I_MUTEX_NONDIR2);
} else {
/* src >= dest */
inode_lock(dest);
}
error = break_layout(dest, false);
if (error == -EWOULDBLOCK) {
inode_unlock(dest);
if (src < dest)
inode_unlock(src);
error = break_layout(dest, true);
if (error)
return error;
goto retry;
}
if (error) {
inode_unlock(dest);
if (src < dest)
inode_unlock(src);
return error;
}
if (src > dest)
inode_lock_nested(src, I_MUTEX_NONDIR2);
return 0;
}
/*
* Link a range of blocks from one file to another.
*/
@ -1274,7 +1318,9 @@ xfs_reflink_remap_range(
return -EIO;
/* Lock both files against IO */
lock_two_nondirectories(inode_in, inode_out);
ret = xfs_iolock_two_inodes_and_break_layout(inode_in, inode_out);
if (ret)
return ret;
if (same_inode)
xfs_ilock(src, XFS_MMAPLOCK_EXCL);
else