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xfs: pull up iolock from xfs_free_eofblocks()

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xfs_free_eofblocks() requires the IOLOCK_EXCL lock, but is called from
different contexts where the lock may or may not be held. The
need_iolock parameter exists for this reason, to indicate whether
xfs_free_eofblocks() must acquire the iolock itself before it can
proceed.

This is ugly and confusing. Simplify the semantics of
xfs_free_eofblocks() to require the caller to acquire the iolock
appropriately and kill the need_iolock parameter. While here, the mp
param can be removed as well as the xfs_mount is accessible from the
xfs_inode structure. This patch does not change behavior.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-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>
This commit is contained in:
Brian Foster 2017-01-27 23:22:55 -08:00 • committed by Darrick J. Wong
parent 64f61ab604
commit a36b926180
4 changed files with 61 additions and 60 deletions
Download patch file Download diff file Expand all files Collapse all files

24
fs/xfs/xfs_icache.c
View file

@ -1322,7 +1322,7 @@ xfs_inode_free_eofblocks(
int flags,
void *args)
{
int ret;
int ret = 0;
struct xfs_eofblocks *eofb = args;
bool need_iolock = true;
int match;
@ -1358,19 +1358,25 @@ xfs_inode_free_eofblocks(
return 0;
/*
* A scan owner implies we already hold the iolock. Skip it in
* xfs_free_eofblocks() to avoid deadlock. This also eliminates
* the possibility of EAGAIN being returned.
* A scan owner implies we already hold the iolock. Skip it here
* to avoid deadlock.
*/
if (eofb->eof_scan_owner == ip->i_ino)
need_iolock = false;
}
ret = xfs_free_eofblocks(ip->i_mount, ip, need_iolock);
/* don't revisit the inode if we're not waiting */
if (ret == -EAGAIN && !(flags & SYNC_WAIT))
ret = 0;
/*
* If the caller is waiting, return -EAGAIN to keep the background
* scanner moving and revisit the inode in a subsequent pass.
*/
if (need_iolock && !xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
if (flags & SYNC_WAIT)
ret = -EAGAIN;
return ret;
}
ret = xfs_free_eofblocks(ip);
if (need_iolock)
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
}