iget: stop ISOFS from using read_inode()

Stop the ISOFS filesystem from using read_inode().  Make isofs_read_inode()
return an error code, and make isofs_iget() pass it on.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Jan Kara <jack@ucw.cz>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: "Dave Young" <hidave.darkstar@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 58 insertions, 32 deletions

diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index 29f9753ae5e5..bb219138331a 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -26,11 +26,9 @@ isofs_export_iget(struct super_block *sb,
         if (block == 0)
                 return ERR_PTR(-ESTALE);
         inode = isofs_iget(sb, block, offset);
-        if (inode == NULL)
-                return ERR_PTR(-ENOMEM);
-        if (is_bad_inode(inode)
-            || (generation && inode->i_generation != generation))
-        {
+        if (IS_ERR(inode))
+                return ERR_CAST(inode);
+        if (generation && inode->i_generation != generation) {
                 iput(inode);
                 return ERR_PTR(-ESTALE);
         }
@@ -110,8 +108,10 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
         parent_inode = isofs_iget(child_inode->i_sb,
                                   parent_block,
                                   parent_offset);
-        if (parent_inode == NULL) {
-                rv = ERR_PTR(-EACCES);
+        if (IS_ERR(parent_inode)) {
+                rv = ERR_CAST(parent_inode);
+                if (rv != ERR_PTR(-ENOMEM))
+                        rv = ERR_PTR(-EACCES);
                 goto out;
         }
 
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 09e3d306e96f..875d37fb6c70 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -54,7 +54,7 @@ static void isofs_put_super(struct super_block *sb)
         return;
 }
 
-static void isofs_read_inode(struct inode *);
+static int isofs_read_inode(struct inode *);
 static int isofs_statfs (struct dentry *, struct kstatfs *);
 
 static struct kmem_cache *isofs_inode_cachep;
@@ -107,7 +107,6 @@ static int isofs_remount(struct super_block *sb, int *flags, char *data)
 static const struct super_operations isofs_sops = {
         .alloc_inode    = isofs_alloc_inode,
         .destroy_inode  = isofs_destroy_inode,
-        .read_inode     = isofs_read_inode,
         .put_super      = isofs_put_super,
         .statfs         = isofs_statfs,
         .remount_fs     = isofs_remount,
@@ -552,7 +551,7 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
         int joliet_level = 0;
         int iso_blknum, block;
         int orig_zonesize;
-        int table;
+        int table, error = -EINVAL;
         unsigned int vol_desc_start;
 
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
@@ -810,6 +809,8 @@ root_found:
          * we then decide whether to use the Joliet descriptor.
          */
         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+        if (IS_ERR(inode))
+                goto out_no_root;
 
         /*
          * If this disk has both Rock Ridge and Joliet on it, then we
@@ -829,6 +830,8 @@ root_found:
                                 "ISOFS: changing to secondary root\n");
                         iput(inode);
                         inode = isofs_iget(s, sbi->s_firstdatazone, 0);
+                        if (IS_ERR(inode))
+                                goto out_no_root;
                 }
         }
 
@@ -842,8 +845,6 @@ root_found:
         sbi->s_joliet_level = joliet_level;
 
         /* check the root inode */
-        if (!inode)
-                goto out_no_root;
         if (!inode->i_op)
                 goto out_bad_root;
 
@@ -876,11 +877,14 @@ root_found:
          */
 out_bad_root:
         printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
-        goto out_iput;
-out_no_root:
-        printk(KERN_WARNING "%s: get root inode failed\n", __func__);
 out_iput:
         iput(inode);
+        goto out_no_inode;
+out_no_root:
+        error = PTR_ERR(inode);
+        if (error != -ENOMEM)
+                printk(KERN_WARNING "%s: get root inode failed\n", __func__);
+out_no_inode:
 #ifdef CONFIG_JOLIET
         if (sbi->s_nls_iocharset)
                 unload_nls(sbi->s_nls_iocharset);
@@ -908,7 +912,7 @@ out_freesbi:
         kfree(opt.iocharset);
         kfree(sbi);
         s->s_fs_info = NULL;
-        return -EINVAL;
+        return error;
 }
 
 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
@@ -930,7 +934,7 @@ static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
 /*
  * Get a set of blocks; filling in buffer_heads if already allocated
  * or getblk() if they are not.  Returns the number of blocks inserted
- * (0 == error.)
+ * (-ve == error.)
  */
 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
                      struct buffer_head **bh, unsigned long nblocks)
@@ -940,11 +944,12 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
         unsigned int firstext;
         unsigned long nextblk, nextoff;
         long iblock = (long)iblock_s;
-        int section, rv;
+        int section, rv, error;
         struct iso_inode_info *ei = ISOFS_I(inode);
 
         lock_kernel();
 
+        error = -EIO;
         rv = 0;
         if (iblock < 0 || iblock != iblock_s) {
                 printk(KERN_DEBUG "%s: block number too large\n", __func__);
@@ -983,8 +988,10 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
 
                         offset += sect_size;
                         ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
-                        if (!ninode)
+                        if (IS_ERR(ninode)) {
+                                error = PTR_ERR(ninode);
                                 goto abort;
+                        }
                         firstext  = ISOFS_I(ninode)->i_first_extent;
                         sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
                         nextblk   = ISOFS_I(ninode)->i_next_section_block;
@@ -1015,9 +1022,10 @@ int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
                 rv++;
         }
 
+        error = 0;
 abort:
         unlock_kernel();
-        return rv;
+        return rv != 0 ? rv : error;
 }
 
 /*
@@ -1026,12 +1034,15 @@ abort:
 static int isofs_get_block(struct inode *inode, sector_t iblock,
                     struct buffer_head *bh_result, int create)
 {
+        int ret;
+
         if (create) {
                 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
                 return -EROFS;
         }
 
-        return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
+        ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
+        return ret < 0 ? ret : 0;
 }
 
 static int isofs_bmap(struct inode *inode, sector_t block)
@@ -1186,7 +1197,7 @@ out_toomany:
         goto out;
 }
 
-static void isofs_read_inode(struct inode *inode)
+static int isofs_read_inode(struct inode *inode)
 {
         struct super_block *sb = inode->i_sb;
         struct isofs_sb_info *sbi = ISOFS_SB(sb);
@@ -1199,6 +1210,7 @@ static void isofs_read_inode(struct inode *inode)
         unsigned int de_len;
         unsigned long offset;
         struct iso_inode_info *ei = ISOFS_I(inode);
+        int ret = -EIO;
 
         block = ei->i_iget5_block;
         bh = sb_bread(inode->i_sb, block);
@@ -1216,6 +1228,7 @@ static void isofs_read_inode(struct inode *inode)
                 tmpde = kmalloc(de_len, GFP_KERNEL);
                 if (tmpde == NULL) {
                         printk(KERN_INFO "%s: out of memory\n", __func__);
+                        ret = -ENOMEM;
                         goto fail;
                 }
                 memcpy(tmpde, bh->b_data + offset, frag1);
@@ -1259,8 +1272,10 @@ static void isofs_read_inode(struct inode *inode)
 
         ei->i_section_size = isonum_733(de->size);
         if (de->flags[-high_sierra] & 0x80) {
-                if(isofs_read_level3_size(inode))
+                ret = isofs_read_level3_size(inode);
+                if (ret < 0)
                         goto fail;
+                ret = -EIO;
         } else {
                 ei->i_next_section_block = 0;
                 ei->i_next_section_offset = 0;
@@ -1346,16 +1361,16 @@ static void isofs_read_inode(struct inode *inode)
                 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 
+        ret = 0;
 out:
         kfree(tmpde);
         if (bh)
                 brelse(bh);
-        return;
+        return ret;
 
 out_badread:
         printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
 fail:
-        make_bad_inode(inode);
         goto out;
 }
 
@@ -1394,9 +1409,10 @@ struct inode *isofs_iget(struct super_block *sb,
         unsigned long hashval;
         struct inode *inode;
         struct isofs_iget5_callback_data data;
+        long ret;
 
         if (offset >= 1ul << sb->s_blocksize_bits)
-                return NULL;
+                return ERR_PTR(-EINVAL);
 
         data.block = block;
         data.offset = offset;
@@ -1406,9 +1422,17 @@ struct inode *isofs_iget(struct super_block *sb,
         inode = iget5_locked(sb, hashval, &isofs_iget5_test,
                                 &isofs_iget5_set, &data);
 
-        if (inode && (inode->i_state & I_NEW)) {
-                sb->s_op->read_inode(inode);
-                unlock_new_inode(inode);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+
+        if (inode->i_state & I_NEW) {
+                ret = isofs_read_inode(inode);
+                if (ret < 0) {
+                        iget_failed(inode);
+                        inode = ERR_PTR(ret);
+                } else {
+                        unlock_new_inode(inode);
+                }
         }
 
         return inode;
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index e2b4dad39ca9..344b247bc29a 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -179,9 +179,9 @@ struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, struct nam
         inode = NULL;
         if (found) {
                 inode = isofs_iget(dir->i_sb, block, offset);
-                if (!inode) {
+                if (IS_ERR(inode)) {
                         unlock_kernel();
-                        return ERR_PTR(-EACCES);
+                        return ERR_CAST(inode);
                 }
         }
         unlock_kernel();
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index f3a1db3098de..6bd48f0a7047 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -474,8 +474,10 @@ repeat:
                             isofs_iget(inode->i_sb,
                                        ISOFS_I(inode)->i_first_extent,
                                        0);
-                        if (!reloc)
+                        if (IS_ERR(reloc)) {
+                                ret = PTR_ERR(reloc);
                                 goto out;
+                        }
                         inode->i_mode = reloc->i_mode;
                         inode->i_nlink = reloc->i_nlink;
                         inode->i_uid = reloc->i_uid;