ocfs2: detect released suballocator BG for fh_to_[dentry|parent]

After ocfs2 gained the ability to reclaim suballocator free block group
(BGs), a suballocator block group may be released.  This change causes the
xfstest case generic/426 to fail.

generic/426 expects return value -ENOENT or -ESTALE, but the current code
triggers -EROFS.

Call stack before ocfs2 gained the ability to reclaim bg:

ocfs2_fh_to_dentry //or ocfs2_fh_to_parent
 ocfs2_get_dentry
  + ocfs2_test_inode_bit
  |  ocfs2_test_suballoc_bit
  |   + ocfs2_read_group_descriptor //Since ocfs2 never releases the bg,
  |   |                             //the bg block was always found.
  |   + *res = ocfs2_test_bit //unlink was called, and the bit is zero
  |
  + if (!set) //because the above *res is 0
     status = -ESTALE //the generic/426 expected return value

Current call stack that triggers -EROFS:

ocfs2_get_dentry
 ocfs2_test_inode_bit
  ocfs2_test_suballoc_bit
   ocfs2_read_group_descriptor
    + if reading a released bg, validation fails and triggers -EROFS

How to fix:
Since the read BG is already released, we must avoid triggering -EROFS. 
With this commit, we use ocfs2_read_hint_group_descriptor() to detect the
released BG block.  This approach quietly handles this type of error and
returns -EINVAL, which triggers the caller's existing conversion path to
-ESTALE.

[dan.carpenter@linaro.org: fix uninitialized variable]
  Link: https://lkml.kernel.org/r/dc37519fd2470909f8c65e26c5131b8b6dde2a5c.1766043917.git.dan.carpenter@linaro.org
Link: https://lkml.kernel.org/r/20251212074505.25962-3-heming.zhao@suse.com
Signed-off-by: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Su Yue <glass.su@suse.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 21 insertions, 11 deletions

diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index b95724b767e1..9c2665dd24e2 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -74,8 +74,9 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
 			 * nice
 			 */
 			status = -ESTALE;
-		} else
+		} else if (status != -ESTALE) {
 			mlog(ML_ERROR, "test inode bit failed %d\n", status);
+		}
 		goto unlock_nfs_sync;
 	}
 
@@ -162,8 +163,9 @@ static struct dentry *ocfs2_get_parent(struct dentry *child)
 	if (status < 0) {
 		if (status == -EINVAL) {
 			status = -ESTALE;
-		} else
+		} else if (status != -ESTALE) {
 			mlog(ML_ERROR, "test inode bit failed %d\n", status);
+		}
 		parent = ERR_PTR(status);
 		goto bail_unlock;
 	}
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index aac2f96bee43..79d1325b2111 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -3163,7 +3163,7 @@ static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
 	struct ocfs2_group_desc *group;
 	struct buffer_head *group_bh = NULL;
 	u64 bg_blkno;
-	int status;
+	int status, quiet = 0, released = 0;
 
 	trace_ocfs2_test_suballoc_bit((unsigned long long)blkno,
 				      (unsigned int)bit);
@@ -3179,9 +3179,13 @@ static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
 
 	bg_blkno = group_blkno ? group_blkno :
 		   ocfs2_which_suballoc_group(blkno, bit);
-	status = ocfs2_read_group_descriptor(suballoc, alloc_di, bg_blkno,
-					     &group_bh);
-	if (status < 0) {
+	status = ocfs2_read_hint_group_descriptor(suballoc, alloc_di, bg_blkno,
+					     &group_bh, &released);
+	if (released) {
+		quiet = 1;
+		status = -ESTALE;
+		goto bail;
+	} else if (status < 0) {
 		mlog(ML_ERROR, "read group %llu failed %d\n",
 		     (unsigned long long)bg_blkno, status);
 		goto bail;
@@ -3193,7 +3197,7 @@ static int ocfs2_test_suballoc_bit(struct ocfs2_super *osb,
 bail:
 	brelse(group_bh);
 
-	if (status)
+	if (status && !quiet)
 		mlog_errno(status);
 	return status;
 }
@@ -3213,7 +3217,7 @@ bail:
  */
 int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
 {
-	int status;
+	int status, quiet = 0;
 	u64 group_blkno = 0;
 	u16 suballoc_bit = 0, suballoc_slot = 0;
 	struct inode *inode_alloc_inode;
@@ -3255,8 +3259,12 @@ int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
 
 	status = ocfs2_test_suballoc_bit(osb, inode_alloc_inode, alloc_bh,
 					 group_blkno, blkno, suballoc_bit, res);
-	if (status < 0)
-		mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
+	if (status < 0) {
+		if (status == -ESTALE)
+			quiet = 1;
+		else
+			mlog(ML_ERROR, "test suballoc bit failed %d\n", status);
+	}
 
 	ocfs2_inode_unlock(inode_alloc_inode, 0);
 	inode_unlock(inode_alloc_inode);
@@ -3264,7 +3272,7 @@ int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res)
 	iput(inode_alloc_inode);
 	brelse(alloc_bh);
 bail:
-	if (status)
+	if (status && !quiet)
 		mlog_errno(status);
 	return status;
 }