xfs: take m_growlock when running growfsrt

Take the grow lock when we're expanding the realtime volume, like we do
for the other growfs calls.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 0c3e96c621a672d43fb9394d703f7a5dfbb8e0e4..776d6c401f62fb6fb3c0bc21258e18e74f633f54 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -821,34 +821,39 @@ xfs_growfs_rt(
        /* Needs to have been mounted with an rt device. */
        if (!XFS_IS_REALTIME_MOUNT(mp))
                return -EINVAL;
+
+       if (!mutex_trylock(&mp->m_growlock))
+               return -EWOULDBLOCK;
        /*
         * Mount should fail if the rt bitmap/summary files don't load, but
         * we'll check anyway.
         */
+       error = -EINVAL;
        if (!mp->m_rbmip || !mp->m_rsumip)
-               return -EINVAL;
+               goto out_unlock;
 
        /* Shrink not supported. */
        if (in->newblocks <= sbp->sb_rblocks)
-               return -EINVAL;
+               goto out_unlock;
 
        /* Can only change rt extent size when adding rt volume. */
        if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
-               return -EINVAL;
+               goto out_unlock;
 
        /* Range check the extent size. */
        if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
            XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
-               return -EINVAL;
+               goto out_unlock;
 
        /* Unsupported realtime features. */
+       error = -EOPNOTSUPP;
        if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
-               return -EOPNOTSUPP;
+               goto out_unlock;
 
        nrblocks = in->newblocks;
        error = xfs_sb_validate_fsb_count(sbp, nrblocks);
        if (error)
-               return error;
+               goto out_unlock;
        /*
         * Read in the last block of the device, make sure it exists.
         */
@@ -856,7 +861,7 @@ xfs_growfs_rt(
                                XFS_FSB_TO_BB(mp, nrblocks - 1),
                                XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
        if (error)
-               return error;
+               goto out_unlock;
        xfs_buf_relse(bp);
 
        /*
@@ -864,8 +869,10 @@ xfs_growfs_rt(
         */
        nrextents = nrblocks;
        do_div(nrextents, in->extsize);
-       if (!xfs_validate_rtextents(nrextents))
-               return -EINVAL;
+       if (!xfs_validate_rtextents(nrextents)) {
+               error = -EINVAL;
+               goto out_unlock;
+       }
        nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
        nrextslog = xfs_compute_rextslog(nrextents);
        nrsumlevels = nrextslog + 1;
@@ -876,8 +883,11 @@ xfs_growfs_rt(
         * the log.  This prevents us from getting a log overflow,
         * since we'll log basically the whole summary file at once.
         */
-       if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
-               return -EINVAL;
+       if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1)) {
+               error = -EINVAL;
+               goto out_unlock;
+       }
+
        /*
         * Get the old block counts for bitmap and summary inodes.
         * These can't change since other growfs callers are locked out.
@@ -889,10 +899,10 @@ xfs_growfs_rt(
         */
        error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
        if (error)
-               return error;
+               goto out_unlock;
        error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
        if (error)
-               return error;
+               goto out_unlock;
 
        rsum_cache = mp->m_rsum_cache;
        if (nrbmblocks != sbp->sb_rbmblocks)
@@ -1059,6 +1069,8 @@ out_free:
                }
        }
 
+out_unlock:
+       mutex_unlock(&mp->m_growlock);
        return error;
 }