GFS2: Don't try and dealloc own inode

When searching for unlinked, but still allocated inodes during block
allocation, avoid the block relating to the inode that is doing the
allocation. This fixes a hang caused when an unlinked, but still
open, inode tries to allocate some more blocks and lands up
finding itself during the search for deallocatable inodes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index daa4ae3..5e50741 100644 (file)
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -961,7 +961,8 @@ static int try_rgrp_fit(struct gfs2_rgrpd *rgd, struct gfs2_alloc *al)
  * Returns: The inode, if one has been found
  */
 
-static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked)
+static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked,
+                                    u64 skip)
 {
        struct inode *inode;
        u32 goal = 0, block;
@@ -985,6 +986,8 @@ static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked)
                goal++;
                if (*last_unlinked != NO_BLOCK && no_addr <= *last_unlinked)
                        continue;
+               if (no_addr == skip)
+                       continue;
                *last_unlinked = no_addr;
                inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, DT_UNKNOWN,
                                          no_addr, -1, 1);
@@ -1104,7 +1107,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
                        if (try_rgrp_fit(rgd, al))
                                goto out;
                        if (rgd->rd_flags & GFS2_RDF_CHECK)
-                               inode = try_rgrp_unlink(rgd, last_unlinked);
+                               inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
                        if (!rg_locked)
                                gfs2_glock_dq_uninit(&al->al_rgd_gh);
                        if (inode)
@@ -1138,7 +1141,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
                        if (try_rgrp_fit(rgd, al))
                                goto out;
                        if (rgd->rd_flags & GFS2_RDF_CHECK)
-                               inode = try_rgrp_unlink(rgd, last_unlinked);
+                               inode = try_rgrp_unlink(rgd, last_unlinked, ip->i_no_addr);
                        if (!rg_locked)
                                gfs2_glock_dq_uninit(&al->al_rgd_gh);
                        if (inode)