xfs: fix deadlock in xfs_rtfree_extent
To fix the deadlock caused by repeatedly calling xfs_rtfree_extent - removed xfs_ilock() and xfs_trans_ijoin() from xfs_rtfree_extent(), instead added asserts that the inode is locked and has an inode_item attached to it. - in xfs_bunmapi() when dealing with an inode with the rt flag call xfs_ilock() and xfs_trans_ijoin() so that the reference count is bumped on the inode and attached it to the transaction before calling into xfs_bmap_del_extent, similar to what we do in xfs_bmap_rtalloc. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Reviewed-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Ben Myers <bpm@sgi.com>
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@ -5124,6 +5124,15 @@ xfs_bunmapi(
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cur->bc_private.b.flags = 0;
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} else
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cur = NULL;
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if (isrt) {
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/*
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* Synchronize by locking the bitmap inode.
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*/
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xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
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}
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extno = 0;
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while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
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(nexts == 0 || extno < nexts)) {
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@ -183,6 +183,7 @@ error_cancel:
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oblocks = map.br_startoff + map.br_blockcount;
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}
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return 0;
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error:
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return error;
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}
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@ -2139,11 +2140,9 @@ xfs_rtfree_extent(
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xfs_buf_t *sumbp; /* summary file block buffer */
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mp = tp->t_mountp;
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/*
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* Synchronize by locking the bitmap inode.
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*/
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xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
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ASSERT(mp->m_rbmip->i_itemp != NULL);
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ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
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#if defined(__KERNEL__) && defined(DEBUG)
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/*
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