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Subject[PATCH 21/31] IGET: Stop JFS from using iget() and read_inode() [try #3]
Date
Stop the JFS filesystem from using iget() and read_inode().  Replace
jfs_read_inode() with jfs_iget(), and call that instead of iget().
jfs_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

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

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
---
fs/jfs/inode.c | 20 ++++++++++++++++----
fs/jfs/jfs_inode.h | 2 +-
fs/jfs/namei.c | 34 ++++++++++++++--------------------
fs/jfs/super.c | 15 +++++++++------
4 files changed, 40 insertions(+), 31 deletions(-)
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 3467dde..5081e76 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -31,11 +31,21 @@
#include "jfs_debug.h"


-void jfs_read_inode(struct inode *inode)
+struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
{
- if (diRead(inode)) {
- make_bad_inode(inode);
- return;
+ struct inode *inode;
+ int ret;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ ret = diRead(inode);
+ if (ret < 0) {
+ iget_failed(inode);
+ return ERR_PTR(ret);
}

if (S_ISREG(inode->i_mode)) {
@@ -55,6 +65,8 @@ void jfs_read_inode(struct inode *inode)
inode->i_op = &jfs_file_inode_operations;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
}
+ unlock_new_inode(inode);
+ return inode;
}

/*
diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h
index f0ec72b..71ea106 100644
--- a/fs/jfs/jfs_inode.h
+++ b/fs/jfs/jfs_inode.h
@@ -22,7 +22,7 @@ extern struct inode *ialloc(struct inode *, umode_t);
extern int jfs_fsync(struct file *, struct dentry *, int);
extern int jfs_ioctl(struct inode *, struct file *,
unsigned int, unsigned long);
-extern void jfs_read_inode(struct inode *);
+extern struct inode *jfs_iget(struct super_block *, unsigned long);
extern int jfs_commit_inode(struct inode *, int);
extern int jfs_write_inode(struct inode*, int);
extern void jfs_delete_inode(struct inode *);
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 932797b..6915a3d 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1461,12 +1461,10 @@ static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struc
}
}

- ip = iget(dip->i_sb, inum);
- if (ip == NULL || is_bad_inode(ip)) {
+ ip = jfs_iget(dip->i_sb, inum);
+ if (IS_ERR(ip)) {
jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
- if (ip)
- iput(ip);
- return ERR_PTR(-EACCES);
+ return ERR_CAST(ip);
}

dentry = d_splice_alias(ip, dentry);
@@ -1487,12 +1485,11 @@ struct dentry *jfs_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 = jfs_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;
}
@@ -1518,17 +1515,14 @@ struct dentry *jfs_get_parent(struct dentry *dentry)

parent_ino =
le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
- inode = iget(sb, parent_ino);
- if (inode) {
- if (is_bad_inode(inode)) {
+ inode = jfs_iget(sb, parent_ino);
+ if (IS_ERR(inode)) {
+ parent = ERR_CAST(inode);
+ } else {
+ parent = d_alloc_anon(inode);
+ if (!parent) {
+ parent = ERR_PTR(-ENOMEM);
iput(inode);
- parent = ERR_PTR(-EACCES);
- } else {
- parent = d_alloc_anon(inode);
- if (!parent) {
- parent = ERR_PTR(-ENOMEM);
- iput(inode);
- }
}
}

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 4b372f5..f499634 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -414,7 +414,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode;
int rc;
s64 newLVSize = 0;
- int flag;
+ int flag, ret = -EINVAL;

jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);

@@ -461,8 +461,10 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
* Initialize direct-mapping inode/address-space
*/
inode = new_inode(sb);
- if (inode == NULL)
+ if (inode == NULL) {
+ ret = -ENOMEM;
goto out_kfree;
+ }
inode->i_ino = 0;
inode->i_nlink = 1;
inode->i_size = sb->s_bdev->bd_inode->i_size;
@@ -494,9 +496,11 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)

sb->s_magic = JFS_SUPER_MAGIC;

- inode = iget(sb, ROOT_I);
- if (!inode || is_bad_inode(inode))
+ inode = jfs_iget(sb, ROOT_I);
+ if (IS_ERR(inode)) {
+ ret = PTR_ERR(inode);
goto out_no_root;
+ }
sb->s_root = d_alloc_root(inode);
if (!sb->s_root)
goto out_no_root;
@@ -536,7 +540,7 @@ out_kfree:
if (sbi->nls_tab)
unload_nls(sbi->nls_tab);
kfree(sbi);
- return -EINVAL;
+ return ret;
}

static void jfs_write_super_lockfs(struct super_block *sb)
@@ -720,7 +724,6 @@ out:
static const struct super_operations jfs_super_operations = {
.alloc_inode = jfs_alloc_inode,
.destroy_inode = jfs_destroy_inode,
- .read_inode = jfs_read_inode,
.dirty_inode = jfs_dirty_inode,
.write_inode = jfs_write_inode,
.delete_inode = jfs_delete_inode,
-
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