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Subject[PATCH 11/31] IGET: Stop EFS from using iget() and read_inode() [try #4]
Date
Stop the EFS filesystem from using iget() and read_inode().  Replace
efs_read_inode() with efs_iget(), and call that instead of iget().
efs_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

efs_fill_super() returns any error incurred when getting the root inode
instead of EACCES.

Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/efs/inode.c | 25 +++++++++++++++++--------
fs/efs/namei.c | 23 ++++++++++++-----------
fs/efs/super.c | 18 ++++++++++++------
include/linux/efs_fs.h | 2 +-
4 files changed, 42 insertions(+), 26 deletions(-)
diff --git a/fs/efs/inode.c b/fs/efs/inode.c
index 174696f..627c302 100644
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
@@ -45,17 +45,26 @@ static inline void extent_copy(efs_extent *src, efs_extent *dst) {
return;
}

-void efs_read_inode(struct inode *inode)
+struct inode *efs_iget(struct super_block *super, unsigned long ino)
{
int i, inode_index;
dev_t device;
u32 rdev;
struct buffer_head *bh;
- struct efs_sb_info *sb = SUPER_INFO(inode->i_sb);
- struct efs_inode_info *in = INODE_INFO(inode);
+ struct efs_sb_info *sb = SUPER_INFO(super);
+ struct efs_inode_info *in;
efs_block_t block, offset;
struct efs_dinode *efs_inode;
-
+ struct inode *inode;
+
+ inode = iget_locked(super, ino);
+ if (IS_ERR(inode))
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ in = INODE_INFO(inode);
+
/*
** EFS layout:
**
@@ -159,13 +168,13 @@ void efs_read_inode(struct inode *inode)
break;
}

- return;
+ unlock_new_inode(inode);
+ return inode;

read_inode_error:
printk(KERN_WARNING "EFS: failed to read inode %lu\n", inode->i_ino);
- make_bad_inode(inode);
-
- return;
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
}

static inline efs_block_t
diff --git a/fs/efs/namei.c b/fs/efs/namei.c
index 5276b19..77d7106 100644
--- a/fs/efs/namei.c
+++ b/fs/efs/namei.c
@@ -64,9 +64,10 @@ struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, struct namei
lock_kernel();
inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
if (inodenum) {
- if (!(inode = iget(dir->i_sb, inodenum))) {
+ inode = efs_iget(dir->i_sb, inodenum);
+ if (IS_ERR(inode)) {
unlock_kernel();
- return ERR_PTR(-EACCES);
+ return ERR_CAST(inode);
}
}
unlock_kernel();
@@ -85,12 +86,11 @@ struct dentry *efs_get_dentry(struct super_block *sb, void *vobjp)

if (ino == 0)
return ERR_PTR(-ESTALE);
- inode = iget(sb, ino);
- if (inode == NULL)
- return ERR_PTR(-ENOMEM);
+ inode = efs_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);

- if (is_bad_inode(inode) ||
- (generation && inode->i_generation != generation)) {
+ if (generation && inode->i_generation != generation) {
result = ERR_PTR(-ESTALE);
goto out_iput;
}
@@ -112,7 +112,7 @@ struct dentry *efs_get_parent(struct dentry *child)
struct dentry *parent;
struct inode *inode;
efs_ino_t ino;
- int error;
+ long error;

lock_kernel();

@@ -121,10 +121,11 @@ struct dentry *efs_get_parent(struct dentry *child)
if (!ino)
goto fail;

- error = -EACCES;
- inode = iget(child->d_inode->i_sb, ino);
- if (!inode)
+ inode = efs_iget(child->d_inode->i_sb, ino);
+ if (IS_ERR(inode)) {
+ error = PTR_ERR(inode);
goto fail;
+ }

error = -ENOMEM;
parent = d_alloc_anon(inode);
diff --git a/fs/efs/super.c b/fs/efs/super.c
index ce4acb8..685279d 100644
--- a/fs/efs/super.c
+++ b/fs/efs/super.c
@@ -107,7 +107,6 @@ static int efs_remount(struct super_block *sb, int *flags, char *data)
static const struct super_operations efs_superblock_operations = {
.alloc_inode = efs_alloc_inode,
.destroy_inode = efs_destroy_inode,
- .read_inode = efs_read_inode,
.put_super = efs_put_super,
.statfs = efs_statfs,
.remount_fs = efs_remount,
@@ -246,6 +245,7 @@ static int efs_fill_super(struct super_block *s, void *d, int silent)
struct efs_sb_info *sb;
struct buffer_head *bh;
struct inode *root;
+ int ret = -EINVAL;

sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
if (!sb)
@@ -302,12 +302,18 @@ static int efs_fill_super(struct super_block *s, void *d, int silent)
}
s->s_op = &efs_superblock_operations;
s->s_export_op = &efs_export_ops;
- root = iget(s, EFS_ROOTINODE);
- s->s_root = d_alloc_root(root);
-
- if (!(s->s_root)) {
+ root = efs_iget(s, EFS_ROOTINODE);
+ if (IS_ERR(root)) {
printk(KERN_ERR "EFS: get root inode failed\n");
+ ret = PTR_ERR(root);
+ goto out_no_fs;
+ }
+
+ s->s_root = d_alloc_root(root);
+ if (!(s->s_root)) {
+ printk(KERN_ERR "EFS: get root dentry failed\n");
iput(root);
+ ret = -ENOMEM;
goto out_no_fs;
}

@@ -317,7 +323,7 @@ out_no_fs_ul:
out_no_fs:
s->s_fs_info = NULL;
kfree(sb);
- return -EINVAL;
+ return ret;
}

static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
diff --git a/include/linux/efs_fs.h b/include/linux/efs_fs.h
index 16cb25c..18b725f 100644
--- a/include/linux/efs_fs.h
+++ b/include/linux/efs_fs.h
@@ -40,7 +40,7 @@ extern const struct inode_operations efs_dir_inode_operations;
extern const struct file_operations efs_dir_operations;
extern const struct address_space_operations efs_symlink_aops;

-extern void efs_read_inode(struct inode *);
+extern struct inode *efs_iget(struct super_block *, unsigned long);
extern efs_block_t efs_map_block(struct inode *, efs_block_t);
extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);

-
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