Stop the HOSTFS filesystem from using iget() and read_inode(). Provide
hostfs_iget(), and call that instead of iget(). hostfs_iget() then uses
iget_locked() directly and returns a proper error code instead of an inode in
the event of an error.
hostfs_fill_sb_common() returns any error incurred when getting the root inode
instead of EINVAL.
Note that the contents of hostfs_kern.c need to be examined:
(*) hostfs_iget() should perhaps subsume init_inode() and hostfs_read_inode().
(*) It would appear that all hostfs inodes are the same inode because iget()
was being called with inode number 0 - which forms the lookup key.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---
fs/hostfs/hostfs_kern.c | 59 +++++++++++++++++++++++++++++++----------------
1 files changed, 39 insertions(+), 20 deletions(-)
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 8966b05..8aafb53 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -202,7 +202,7 @@ static char *follow_link(char *link)
return ERR_PTR(n);
}
-static int read_inode(struct inode *ino)
+static int hostfs_read_inode(struct inode *ino)
{
char *name;
int err = 0;
@@ -233,6 +233,25 @@ static int read_inode(struct inode *ino)
return err;
}
+static struct inode *hostfs_iget(struct super_block *sb)
+{
+ struct inode *inode;
+ long ret;
+
+ inode = iget_locked(sb, 0);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (inode->i_state & I_NEW) {
+ ret = hostfs_read_inode(inode);
+ if (ret < 0) {
+ iget_failed(inode);
+ return ERR_PTR(ret);
+ }
+ unlock_new_inode(inode);
+ }
+ return inode;
+}
+
int hostfs_statfs(struct dentry *dentry, struct kstatfs *sf)
{
/*
@@ -303,17 +322,11 @@ static void hostfs_destroy_inode(struct inode *inode)
kfree(HOSTFS_I(inode));
}
-static void hostfs_read_inode(struct inode *inode)
-{
- read_inode(inode);
-}
-
static const struct super_operations hostfs_sbops = {
.alloc_inode = hostfs_alloc_inode,
.drop_inode = generic_delete_inode,
.delete_inode = hostfs_delete_inode,
.destroy_inode = hostfs_destroy_inode,
- .read_inode = hostfs_read_inode,
.statfs = hostfs_statfs,
};
@@ -571,10 +584,11 @@ int hostfs_create(struct inode *dir, struct dentry *dentry, int mode,
char *name;
int error, fd;
- error = -ENOMEM;
- inode = iget(dir->i_sb, 0);
- if (inode == NULL)
+ inode = hostfs_iget(dir->i_sb);
+ if (IS_ERR(inode)) {
+ error = PTR_ERR(inode);
goto out;
+ }
error = init_inode(inode, dentry);
if (error)
@@ -615,10 +629,11 @@ struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry,
char *name;
int err;
- err = -ENOMEM;
- inode = iget(ino->i_sb, 0);
- if (inode == NULL)
+ inode = hostfs_iget(ino->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
goto out;
+ }
err = init_inode(inode, dentry);
if (err)
@@ -736,11 +751,13 @@ int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
struct inode *inode;
char *name;
- int err = -ENOMEM;
+ int err;
- inode = iget(dir->i_sb, 0);
- if (inode == NULL)
+ inode = hostfs_iget(dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
goto out;
+ }
err = init_inode(inode, dentry);
if (err)
@@ -952,9 +969,11 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
sprintf(host_root_path, "%s/%s", root_ino, req_root);
- root_inode = iget(sb, 0);
- if (root_inode == NULL)
+ root_inode = hostfs_iget(sb);
+ if (IS_ERR(root_inode)) {
+ err = PTR_ERR(root_inode);
goto out_free;
+ }
err = init_inode(root_inode, NULL);
if (err)
@@ -972,8 +991,8 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
if (sb->s_root == NULL)
goto out_put;
- err = read_inode(root_inode);
- if (err) {
+ err = hostfs_read_inode(root_inode);
+ if (err){
/* No iput in this case because the dput does that for us */
dput(sb->s_root);
sb->s_root = NULL;
-
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