GFS2: fix bad inode i_goal values during block allocation

This patch checks if i_goal is either zero or if doesn't exist
within any rgrp (i.e gfs2_blk2rgrpd() returns NULL). If so, it
assigns the ip->i_no_addr block as the i_goal.

There are two scenarios where a bad i_goal can result in a
-EBADSLT error.

1. Attempting to allocate to an existing inode:
Control reaches gfs2_inplace_reserve() and ip->i_goal is bad.
We need to fix i_goal here.

2. A new inode is created in a directory whose i_goal is hosed:
In this case, the parent dir's i_goal is copied onto the new
inode. Since the new inode is not yet created, the ip->i_no_addr
field is invalid and so, the fix in gfs2_inplace_reserve() as per
1) won't work in this scenario. We need to catch and fix it sooner
in the parent dir itself (gfs2_create_inode()), before it is
copied to the new inode.

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

3 files changed, 10 insertions, 0 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index fc8ac2ee0667..9516f5c02151 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -672,6 +672,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
         gfs2_set_inode_blocks(inode, 1);
         munge_mode_uid_gid(dip, inode);
+        check_and_update_goal(dip);
         ip->i_goal = dip->i_goal;
         ip->i_diskflags = 0;
         ip->i_eattr = 0;
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index f4cb9c0d6bbd..55ef72dc5b13 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -577,6 +577,13 @@ struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
         return rgd;
 }
 
+void check_and_update_goal(struct gfs2_inode *ip)
+{
+        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+        if (!ip->i_goal || gfs2_blk2rgrpd(sdp, ip->i_goal, 1) == NULL)
+                ip->i_goal = ip->i_no_addr;
+}
+
 void gfs2_free_clones(struct gfs2_rgrpd *rgd)
 {
         int x;
@@ -1910,6 +1917,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
         } else if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) {
                 rs->rs_rbm.rgd = begin = ip->i_rgd;
         } else {
+                check_and_update_goal(ip);
                 rs->rs_rbm.rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
         }
         if (S_ISDIR(ip->i_inode.i_mode) && (ap->aflags & GFS2_AF_ORLOV))
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 463ab2e95d1c..5d8f085f7ade 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -80,4 +80,5 @@ static inline bool gfs2_rs_active(struct gfs2_blkreserv *rs)
         return rs && !RB_EMPTY_NODE(&rs->rs_node);
 }
 
+extern void check_and_update_goal(struct gfs2_inode *ip);
 #endif /* __RGRP_DOT_H__ */