[PATCH] JFS: return correct error when i-node allocation failed

[Akinobu Mita]

I have seen confusing behavior on JFS when I injected many intentional
slab allocation errors. The cp command failed with no disk space error
with enough disk space.

This patch makes:

- change the return value in case slab allocation failures happen
  from -ENOSPC to -ENOMEM

- ialloc() return error code so that the caller can know the reason
  of failures

Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxx>
Signed-off-by: Akinobu Mita <mita@xxxxxxxxxxxxxxxx>

 fs/jfs/jfs_dtree.c   |    4 ++--
 fs/jfs/jfs_inode.c   |    9 +++++----
 fs/jfs/jfs_unicode.c |    2 +-
 fs/jfs/namei.c       |   18 +++++++++---------
 fs/jfs/super.c       |    2 +-
 5 files changed, 18 insertions(+), 17 deletions(-)

Index: work-shouldfail/fs/jfs/jfs_inode.c
===================================================================
--- work-shouldfail.orig/fs/jfs/jfs_inode.c
+++ work-shouldfail/fs/jfs/jfs_inode.c
@@ -61,7 +61,7 @@ struct inode *ialloc(struct inode *paren
 	inode = new_inode(sb);
 	if (!inode) {
 		jfs_warn("ialloc: new_inode returned NULL!");
-		return inode;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	jfs_inode = JFS_IP(inode);
@@ -69,9 +69,10 @@ struct inode *ialloc(struct inode *paren
 	rc = diAlloc(parent, S_ISDIR(mode), inode);
 	if (rc) {
 		jfs_warn("ialloc: diAlloc returned %d!", rc);
-		make_bad_inode(inode);
+		if (rc == -EIO)
+			make_bad_inode(inode);
 		iput(inode);
-		return NULL;
+		return ERR_PTR(rc);
 	}
 
 	inode->i_uid = current->fsuid;
@@ -97,7 +98,7 @@ struct inode *ialloc(struct inode *paren
 		inode->i_flags |= S_NOQUOTA;
 		inode->i_nlink = 0;
 		iput(inode);
-		return NULL;
+		return ERR_PTR(-EDQUOT);
 	}
 
 	inode->i_mode = mode;
Index: work-shouldfail/fs/jfs/namei.c
===================================================================
--- work-shouldfail.orig/fs/jfs/namei.c
+++ work-shouldfail/fs/jfs/namei.c
@@ -97,8 +97,8 @@ static int jfs_create(struct inode *dip,
 	 * begin the transaction before we search the directory.
 	 */
 	ip = ialloc(dip, mode);
-	if (ip == NULL) {
-		rc = -ENOSPC;
+	if (IS_ERR(ip)) {
+		rc = PTR_ERR(ip);
 		goto out2;
 	}
 
@@ -231,8 +231,8 @@ static int jfs_mkdir(struct inode *dip, 
 	 * begin the transaction before we search the directory.
 	 */
 	ip = ialloc(dip, S_IFDIR | mode);
-	if (ip == NULL) {
-		rc = -ENOSPC;
+	if (IS_ERR(ip)) {
+		rc = PTR_ERR(ip);
 		goto out2;
 	}
 
@@ -908,8 +908,8 @@ static int jfs_symlink(struct inode *dip
 	 * (iAlloc() returns new, locked inode)
 	 */
 	ip = ialloc(dip, S_IFLNK | 0777);
-	if (ip == NULL) {
-		rc = -ENOSPC;
+	if (IS_ERR(ip)) {
+		rc = PTR_ERR(ip);
 		goto out2;
 	}
 
@@ -980,7 +980,7 @@ static int jfs_symlink(struct inode *dip
 		xlen = xsize >> JFS_SBI(sb)->l2bsize;
 		if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
 			txAbort(tid, 0);
-			rc = -ENOSPC;
+			rc = ERR_PTR(rc);
 			goto out3;
 		}
 		extent = xaddr;
@@ -1352,8 +1352,8 @@ static int jfs_mknod(struct inode *dir, 
 		goto out;
 
 	ip = ialloc(dir, mode);
-	if (ip == NULL) {
-		rc = -ENOSPC;
+	if (IS_ERR(ip)) {
+		rc = PTR_ERR(ip);
 		goto out1;
 	}
 	jfs_ip = JFS_IP(ip);
Index: work-shouldfail/fs/jfs/jfs_dtree.c
===================================================================
--- work-shouldfail.orig/fs/jfs/jfs_dtree.c
+++ work-shouldfail/fs/jfs/jfs_dtree.c
@@ -3780,13 +3780,13 @@ static int ciGetLeafPrefixKey(dtpage_t *
 	lkey.name = (wchar_t *) kmalloc((JFS_NAME_MAX + 1) * sizeof(wchar_t),
 					GFP_KERNEL);
 	if (lkey.name == NULL)
-		return -ENOSPC;
+		return -ENOMEM;
 
 	rkey.name = (wchar_t *) kmalloc((JFS_NAME_MAX + 1) * sizeof(wchar_t),
 					GFP_KERNEL);
 	if (rkey.name == NULL) {
 		kfree(lkey.name);
-		return -ENOSPC;
+		return -ENOMEM;
 	}
 
 	/* get left and right key */
Index: work-shouldfail/fs/jfs/super.c
===================================================================
--- work-shouldfail.orig/fs/jfs/super.c
+++ work-shouldfail/fs/jfs/super.c
@@ -422,7 +422,7 @@ static int jfs_fill_super(struct super_b
 
 	sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 	if (!sbi)
-		return -ENOSPC;
+		return -ENOMEM;
 	sb->s_fs_info = sbi;
 	sbi->sb = sb;
 	sbi->uid = sbi->gid = sbi->umask = -1;
Index: work-shouldfail/fs/jfs/jfs_unicode.c
===================================================================
--- work-shouldfail.orig/fs/jfs/jfs_unicode.c
+++ work-shouldfail/fs/jfs/jfs_unicode.c
@@ -124,7 +124,7 @@ int get_UCSname(struct component_name * 
 	    kmalloc((length + 1) * sizeof(wchar_t), GFP_NOFS);
 
 	if (uniName->name == NULL)
-		return -ENOSPC;
+		return -ENOMEM;
 
 	uniName->namlen = jfs_strtoUCS(uniName->name, dentry->d_name.name,
 				       length, nls_tab);
-
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