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Message-ID: <20071025163541.5057.31952.stgit@warthog.procyon.org.uk>
Date: Thu, 25 Oct 2007 17:35:41 +0100
From: David Howells <dhowells@...hat.com>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
dhowells@...hat.com
Subject: [PATCH 20/31] IGET: Stop JFFS2 from using iget() and read_inode()
[try #5]
Stop the JFFS2 filesystem from using iget() and read_inode(). Replace
jffs2_read_inode() with jffs2_iget(), and call that instead of iget().
jffs2_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.
jffs2_do_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/jffs2/dir.c | 6 +++--
fs/jffs2/fs.c | 56 ++++++++++++++++++++++++++++++++-------------------
fs/jffs2/os-linux.h | 2 +-
fs/jffs2/super.c | 1 -
4 files changed, 39 insertions(+), 26 deletions(-)
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 787e392..f948f7e 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -101,10 +101,10 @@ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
ino = fd->ino;
up(&dir_f->sem);
if (ino) {
- inode = iget(dir_i->i_sb, ino);
- if (!inode) {
+ inode = jffs2_iget(dir_i->i_sb, ino);
+ if (IS_ERR(inode)) {
printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
- return (ERR_PTR(-EIO));
+ return ERR_CAST(inode);
}
}
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index d2e06f7..6d1eadd 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -230,16 +230,23 @@ void jffs2_clear_inode (struct inode *inode)
jffs2_do_clear_inode(c, f);
}
-void jffs2_read_inode (struct inode *inode)
+struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
{
struct jffs2_inode_info *f;
struct jffs2_sb_info *c;
struct jffs2_raw_inode latest_node;
union jffs2_device_node jdev;
+ struct inode *inode;
dev_t rdev = 0;
int ret;
- D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
+ D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino));
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
f = JFFS2_INODE_INFO(inode);
c = JFFS2_SB_INFO(inode->i_sb);
@@ -250,9 +257,9 @@ void jffs2_read_inode (struct inode *inode)
ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
if (ret) {
- make_bad_inode(inode);
up(&f->sem);
- return;
+ iget_failed(inode);
+ return ERR_PTR(ret);
}
inode->i_mode = jemode_to_cpu(latest_node.mode);
inode->i_uid = je16_to_cpu(latest_node.uid);
@@ -303,19 +310,14 @@ void jffs2_read_inode (struct inode *inode)
if (f->metadata->size != sizeof(jdev.old) &&
f->metadata->size != sizeof(jdev.new)) {
printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
- up(&f->sem);
- jffs2_do_clear_inode(c, f);
- make_bad_inode(inode);
- return;
+ goto error_io;
}
D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
- if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) {
+ ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
+ if (ret < 0) {
/* Eep */
printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
- up(&f->sem);
- jffs2_do_clear_inode(c, f);
- make_bad_inode(inode);
- return;
+ goto error;
}
if (f->metadata->size == sizeof(jdev.old))
rdev = old_decode_dev(je16_to_cpu(jdev.old));
@@ -335,6 +337,16 @@ void jffs2_read_inode (struct inode *inode)
up(&f->sem);
D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
+ unlock_new_inode(inode);
+ return inode;
+
+error_io:
+ ret = -EIO;
+error:
+ up(&f->sem);
+ jffs2_do_clear_inode(c, f);
+ iget_failed(inode);
+ return ERR_PTR(ret);
}
void jffs2_dirty_inode(struct inode *inode)
@@ -522,15 +534,16 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
if ((ret = jffs2_do_mount_fs(c)))
goto out_inohash;
- ret = -EINVAL;
-
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
- root_i = iget(sb, 1);
- if (is_bad_inode(root_i)) {
+ root_i = jffs2_iget(sb, 1);
+ if (IS_ERR(root_i)) {
D1(printk(KERN_WARNING "get root inode failed\n"));
- goto out_root_i;
+ ret = PTR_ERR(root_i);
+ goto out_root;
}
+ ret = -ENOMEM;
+
D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
sb->s_root = d_alloc_root(root_i);
if (!sb->s_root)
@@ -546,6 +559,7 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
out_root_i:
iput(root_i);
+out_root:
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
if (jffs2_blocks_use_vmalloc(c))
@@ -615,9 +629,9 @@ struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
jffs2_do_unlink() would need the alloc_sem and we have it.
Just iget() it, and if read_inode() is necessary that's OK.
*/
- inode = iget(OFNI_BS_2SFFJ(c), inum);
- if (!inode)
- return ERR_PTR(-ENOMEM);
+ inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
}
if (is_bad_inode(inode)) {
printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n",
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index bf64686..1b10d25 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -175,7 +175,7 @@ extern const struct inode_operations jffs2_symlink_inode_operations;
/* fs.c */
int jffs2_setattr (struct dentry *, struct iattr *);
int jffs2_do_setattr (struct inode *, struct iattr *);
-void jffs2_read_inode (struct inode *);
+struct inode *jffs2_iget(struct super_block *, unsigned long);
void jffs2_clear_inode (struct inode *);
void jffs2_dirty_inode(struct inode *inode);
struct inode *jffs2_new_inode (struct inode *dir_i, int mode,
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index ffa4475..4677355 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -65,7 +65,6 @@ static const struct super_operations jffs2_super_operations =
{
.alloc_inode = jffs2_alloc_inode,
.destroy_inode =jffs2_destroy_inode,
- .read_inode = jffs2_read_inode,
.put_super = jffs2_put_super,
.write_super = jffs2_write_super,
.statfs = jffs2_statfs,
-
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