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Subject[PATCH 22/31] IGET: Stop the MINIX filesystem from using iget() and read_inode() [try #3]
Date
Stop the MINIX filesystem from using iget() and read_inode().  Replace
minix_read_inode() with minix_iget(), and call that instead of iget().
minix_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

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

Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/minix/inode.c | 43 +++++++++++++++++++++++++++++--------------
fs/minix/minix.h | 1 +
fs/minix/namei.c | 7 +++----
3 files changed, 33 insertions(+), 18 deletions(-)
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 43668d7..ee329f8 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -18,7 +18,6 @@
#include <linux/highuid.h>
#include <linux/vfs.h>

-static void minix_read_inode(struct inode * inode);
static int minix_write_inode(struct inode * inode, int wait);
static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
static int minix_remount (struct super_block * sb, int * flags, char * data);
@@ -96,7 +95,6 @@ static void destroy_inodecache(void)
static const struct super_operations minix_sops = {
.alloc_inode = minix_alloc_inode,
.destroy_inode = minix_destroy_inode,
- .read_inode = minix_read_inode,
.write_inode = minix_write_inode,
.delete_inode = minix_delete_inode,
.put_super = minix_put_super,
@@ -149,6 +147,7 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
unsigned long i, block;
struct inode *root_inode;
struct minix_sb_info *sbi;
+ int ret = -EINVAL;

sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
if (!sbi)
@@ -246,10 +245,13 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)

/* set up enough so that it can read an inode */
s->s_op = &minix_sops;
- root_inode = iget(s, MINIX_ROOT_INO);
- if (!root_inode || is_bad_inode(root_inode))
+ root_inode = minix_iget(s, MINIX_ROOT_INO);
+ if (IS_ERR(root_inode)) {
+ ret = PTR_ERR(root_inode);
goto out_no_root;
+ }

+ ret = -ENOMEM;
s->s_root = d_alloc_root(root_inode);
if (!s->s_root)
goto out_iput;
@@ -290,6 +292,7 @@ out_freemap:
goto out_release;

out_no_map:
+ ret = -ENOMEM;
if (!silent)
printk("MINIX-fs: can't allocate map\n");
goto out_release;
@@ -316,7 +319,7 @@ out_bad_sb:
out:
s->s_fs_info = NULL;
kfree(sbi);
- return -EINVAL;
+ return ret;
}

static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
@@ -394,7 +397,7 @@ void minix_set_inode(struct inode *inode, dev_t rdev)
/*
* The minix V1 function to read an inode.
*/
-static void V1_minix_read_inode(struct inode * inode)
+static struct inode *V1_minix_iget(struct inode * inode)
{
struct buffer_head * bh;
struct minix_inode * raw_inode;
@@ -403,8 +406,8 @@ static void V1_minix_read_inode(struct inode * inode)

raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
if (!raw_inode) {
- make_bad_inode(inode);
- return;
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
}
inode->i_mode = raw_inode->i_mode;
inode->i_uid = (uid_t)raw_inode->i_uid;
@@ -420,12 +423,14 @@ static void V1_minix_read_inode(struct inode * inode)
minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
}

/*
* The minix V2 function to read an inode.
*/
-static void V2_minix_read_inode(struct inode * inode)
+static struct inode *V2_minix_iget(struct inode * inode)
{
struct buffer_head * bh;
struct minix2_inode * raw_inode;
@@ -434,8 +439,8 @@ static void V2_minix_read_inode(struct inode * inode)

raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
if (!raw_inode) {
- make_bad_inode(inode);
- return;
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
}
inode->i_mode = raw_inode->i_mode;
inode->i_uid = (uid_t)raw_inode->i_uid;
@@ -453,17 +458,27 @@ static void V2_minix_read_inode(struct inode * inode)
minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
}

/*
* The global function to read an inode.
*/
-static void minix_read_inode(struct inode * inode)
+struct inode *minix_iget(struct super_block *sb, unsigned long ino)
{
+ struct inode *inode;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
if (INODE_VERSION(inode) == MINIX_V1)
- V1_minix_read_inode(inode);
+ return V1_minix_iget(inode);
else
- V2_minix_read_inode(inode);
+ return V2_minix_iget(inode);
}

/*
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index 73ef84f..3ee2242 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -45,6 +45,7 @@ struct minix_sb_info {
unsigned short s_version;
};

+extern struct inode *minix_iget(struct super_block *, unsigned long);
extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
extern struct inode * minix_new_inode(const struct inode * dir, int * error);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index f4aa7a9..3b1684a 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -54,10 +54,9 @@ static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, st

ino = minix_inode_by_name(dentry);
if (ino) {
- inode = iget(dir->i_sb, ino);
-
- if (!inode)
- return ERR_PTR(-EACCES);
+ inode = minix_iget(dir->i_sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
}
d_add(dentry, inode);
return NULL;
-
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