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Subject[PATCH 09/31] IGET: Stop BFS from using iget() and read_inode() [try #3]
Date
Stop the BFS filesystem from using iget() and read_inode().  Replace
bfs_read_inode() with bfs_iget(), and call that instead of iget().
bfs_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

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

Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/bfs/bfs.h | 2 ++
fs/bfs/dir.c | 6 +++---
fs/bfs/inode.c | 32 ++++++++++++++++++++++----------
3 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h
index 130f6c6..5cf50d4 100644
--- a/fs/bfs/bfs.h
+++ b/fs/bfs/bfs.h
@@ -46,6 +46,8 @@ static inline struct bfs_inode_info *BFS_I(struct inode *inode)
#define printf(format, args...) \
printk(KERN_ERR "BFS-fs: %s(): " format, __FUNCTION__, ## args)

+/* inode.c */
+extern struct inode *bfs_iget(struct super_block *sb, unsigned long ino);

/* file.c */
extern const struct inode_operations bfs_file_inops;
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index 097f149..03c8bdb 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -141,10 +141,10 @@ static struct dentry * bfs_lookup(struct inode * dir, struct dentry * dentry, st
if (bh) {
unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
brelse(bh);
- inode = iget(dir->i_sb, ino);
- if (!inode) {
+ inode = bfs_iget(dir->i_sb, ino);
+ if (IS_ERR(inode)) {
unlock_kernel();
- return ERR_PTR(-EACCES);
+ return ERR_CAST(inode);
}
}
unlock_kernel();
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index f346eb1..76798c9 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -32,25 +32,29 @@ MODULE_LICENSE("GPL");

void dump_imap(const char *prefix, struct super_block * s);

-static void bfs_read_inode(struct inode * inode)
+struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
{
- unsigned long ino = inode->i_ino;
struct bfs_inode * di;
struct buffer_head * bh;
+ struct inode *inode;
int block, off;

+ inode = iget_locked(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
if (ino < BFS_ROOT_INO || ino > BFS_SB(inode->i_sb)->si_lasti) {
printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
- make_bad_inode(inode);
- return;
+ goto error;
}

block = (ino - BFS_ROOT_INO)/BFS_INODES_PER_BLOCK + 1;
bh = sb_bread(inode->i_sb, block);
if (!bh) {
printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, ino);
- make_bad_inode(inode);
- return;
+ goto error;
}

off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
@@ -85,6 +89,12 @@ static void bfs_read_inode(struct inode * inode)
BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); /* can be 0 so we store a copy */

brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
+
+error:
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
}

static int bfs_write_inode(struct inode * inode, int unused)
@@ -271,7 +281,6 @@ static void destroy_inodecache(void)
static const struct super_operations bfs_sops = {
.alloc_inode = bfs_alloc_inode,
.destroy_inode = bfs_destroy_inode,
- .read_inode = bfs_read_inode,
.write_inode = bfs_write_inode,
.delete_inode = bfs_delete_inode,
.put_super = bfs_put_super,
@@ -306,6 +315,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
struct inode * inode;
unsigned i, imap_len;
struct bfs_sb_info * info;
+ long ret = -EINVAL;

info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
@@ -340,14 +350,16 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
set_bit(i, info->si_imap);

s->s_op = &bfs_sops;
- inode = iget(s, BFS_ROOT_INO);
- if (!inode) {
+ inode = bfs_iget(s, BFS_ROOT_INO);
+ if (IS_ERR(inode)) {
+ ret = PTR_ERR(inode);
kfree(info->si_imap);
goto out;
}
s->s_root = d_alloc_root(inode);
if (!s->s_root) {
iput(inode);
+ ret = -ENOMEM;
kfree(info->si_imap);
goto out;
}
@@ -402,7 +414,7 @@ out:
brelse(bh);
kfree(info);
s->s_fs_info = NULL;
- return -EINVAL;
+ return ret;
}

static int bfs_get_sb(struct file_system_type *fs_type,
-
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