[PATCH 13/32] IGET: Stop EXT2 from using iget() and read_inode() [try #2]

David Howells
2007-10-04T16:02:53Z

Stop the EXT2 filesystem from using iget() and read_inode(). Replace
ext2_read_inode() with ext2_iget(), and call that instead of iget().
ext2_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

ext2_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/ext2/ext2.h | 2 +-
fs/ext2/inode.c | 30 ++++++++++++++++++++++--------
fs/ext2/namei.c | 12 ++++++------
fs/ext2/super.c | 32 ++++++++++++++++++--------------
4 files changed, 47 insertions(+), 29 deletions(-)

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 9fd0ec5..85ca3de 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -123,7 +123,7 @@ extern void ext2_check_inodes_bitmap (struct super_block *);
extern unsigned long ext2_count_free (struct buffer_head *, unsigned);

/* inode.c */
-extern void ext2_read_inode (struct inode *);
+extern struct inode *ext2_iget (struct super_block *, unsigned long);
extern int ext2_write_inode (struct inode *, int);
extern void ext2_put_inode (struct inode *);
extern void ext2_delete_inode (struct inode *);
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 0079b2c..fa5e115 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1074,20 +1074,32 @@ void ext2_get_inode_flags(struct ext2_inode_info *ei)
ei->i_flags |= EXT2_DIRSYNC_FL;
}

-void ext2_read_inode (struct inode * inode)
+struct inode *ext2_iget (struct super_block *sb, unsigned long ino)
{
- struct ext2_inode_info *ei = EXT2_I(inode);
- ino_t ino = inode->i_ino;
+ struct ext2_inode_info *ei;
struct buffer_head * bh;
- struct ext2_inode * raw_inode = ext2_get_inode(inode->i_sb, ino, &bh);
+ struct ext2_inode * raw_inode;
+ struct inode *inode;
+ long ret = -EIO;
int n;

+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ ei = EXT2_I(inode);
#ifdef CONFIG_EXT2_FS_POSIX_ACL
ei->i_acl = EXT2_ACL_NOT_CACHED;
ei->i_default_acl = EXT2_ACL_NOT_CACHED;
#endif
- if (IS_ERR(raw_inode))
+
+ raw_inode = ext2_get_inode(inode->i_sb, ino, &bh);
+ if (IS_ERR(raw_inode)) {
+ ret = PTR_ERR(raw_inode);
goto bad_inode;
+ }

inode->i_mode = le16_to_cpu(raw_inode->i_mode);
inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
@@ -1111,6 +1123,7 @@ void ext2_read_inode (struct inode * inode)
if (inode->i_nlink == 0 && (inode->i_mode == 0 || ei->i_dtime)) {
/* this inode is deleted */
brelse (bh);
+ ret = -ESTALE;
goto bad_inode;
}
inode->i_blocks = le32_to_cpu(raw_inode->i_blocks);
@@ -1180,11 +1193,12 @@ void ext2_read_inode (struct inode * inode)
}
brelse (bh);
ext2_set_inode_flags(inode);
- return;
+ unlock_new_inode(inode);
+ return inode;

bad_inode:
- make_bad_inode(inode);
- return;
+ iget_failed(inode);
+ return ERR_PTR(ret);
}

static int ext2_update_inode(struct inode * inode, int do_sync)
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index e69beed..80c97fd 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -63,9 +63,9 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, str
ino = ext2_inode_by_name(dir, dentry);
inode = NULL;
if (ino) {
- inode = iget(dir->i_sb, ino);
- if (!inode)
- return ERR_PTR(-EACCES);
+ inode = ext2_iget(dir->i_sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
}
@@ -83,10 +83,10 @@ struct dentry *ext2_get_parent(struct dentry *child)
ino = ext2_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
- inode = iget(child->d_inode->i_sb, ino);
+ inode = ext2_iget(child->d_inode->i_sb, ino);

- if (!inode)
- return ERR_PTR(-EACCES);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
parent = d_alloc_anon(inode);
if (!parent) {
iput(inode);
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 639a32c..33e8b29 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -232,7 +232,6 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *da
static const struct super_operations ext2_sops = {
.alloc_inode = ext2_alloc_inode,
.destroy_inode = ext2_destroy_inode,
- .read_inode = ext2_read_inode,
.write_inode = ext2_write_inode,
.put_inode = ext2_put_inode,
.delete_inode = ext2_delete_inode,
@@ -266,11 +265,10 @@ static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
* it might be "neater" to call ext2_get_inode first and check
* if the inode is valid.....
*/
- inode = iget(sb, ino);
- if (inode == NULL)
- return ERR_PTR(-ENOMEM);
- if (is_bad_inode(inode) ||
- (generation && inode->i_generation != generation)) {
+ inode = ext2_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
/* we didn't find the right inode.. */
iput(inode);
return ERR_PTR(-ESTALE);
@@ -649,6 +647,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
unsigned long logic_sb_block;
unsigned long offset = 0;
unsigned long def_mount_opts;
+ long ret = -EINVAL;
int blocksize = BLOCK_SIZE;
int db_count;
int i, j;
@@ -918,19 +917,24 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &ext2_sops;
sb->s_export_op = &ext2_export_ops;
sb->s_xattr = ext2_xattr_handlers;
- root = iget(sb, EXT2_ROOT_INO);
- sb->s_root = d_alloc_root(root);
- if (!sb->s_root) {
- iput(root);
- printk(KERN_ERR "EXT2-fs: get root inode failed\n");
+ root = ext2_iget(sb, EXT2_ROOT_INO);
+ if (IS_ERR(root)) {
+ ret = PTR_ERR(root);
goto failed_mount3;
}
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
- dput(sb->s_root);
- sb->s_root = NULL;
+ iput(root);
printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
goto failed_mount3;
}
+
+ sb->s_root = d_alloc_root(root);
+ if (!sb->s_root) {
+ iput(root);
+ printk(KERN_ERR "EXT2-fs: get root inode failed\n");
+ ret = -ENOMEM;
+ goto failed_mount3;
+ }
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
ext2_warning(sb, __FUNCTION__,
"mounting ext3 filesystem as ext2");
@@ -957,7 +961,7 @@ failed_mount:
failed_sbi:
sb->s_fs_info = NULL;
kfree(sbi);
- return -EINVAL;
+ return ret;
}

static void ext2_commit_super (struct super_block * sb,