From 755aedc15900ff7d83dd046f632af9a680b0c28f Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 7 Feb 2008 00:15:51 -0800 Subject: [PATCH] iget: stop HPPFS from using iget() and read_inode() Stop the HPPFS filesystem from using iget() and read_inode(). Provide an hppfs_iget(), and call that instead of iget(). hppfs_iget() then uses iget_locked() directly and returns a proper error code instead of an inode in the event of an error. hppfs_fill_sb_common() returns any error incurred when getting the root inode instead of EINVAL. Note that the contents of hppfs_kern.c need to be examined: (*) The HPPFS inode retains a pointer to the proc dentry it is shadowing, but whilst it does appear to retain a reference to it, it doesn't appear to destroy the reference if the inode goes away. (*) hppfs_iget() should perhaps subsume init_inode() and hppfs_read_inode(). (*) It would appear that all hppfs inodes are the same inode because iget() was being called with inode number 0, which forms the lookup key. Signed-off-by: David Howells Acked-by: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hppfs/hppfs_kern.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/fs/hppfs/hppfs_kern.c b/fs/hppfs/hppfs_kern.c index affb741212..a1e1f0f61a 100644 --- a/fs/hppfs/hppfs_kern.c +++ b/fs/hppfs/hppfs_kern.c @@ -155,6 +155,20 @@ static void hppfs_read_inode(struct inode *ino) ino->i_blocks = proc_ino->i_blocks; } +static struct inode *hppfs_iget(struct super_block *sb) +{ + struct inode *inode; + + inode = iget_locked(sb, 0); + if (!inode) + return ERR_PTR(-ENOMEM); + if (inode->i_state & I_NEW) { + hppfs_read_inode(inode); + unlock_new_inode(inode); + } + return inode; +} + static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, struct nameidata *nd) { @@ -190,9 +204,11 @@ static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, if(IS_ERR(proc_dentry)) return(proc_dentry); - inode = iget(ino->i_sb, 0); - if(inode == NULL) + inode = hppfs_iget(ino->i_sb); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); goto out_dput; + } err = init_inode(inode, proc_dentry); if(err) @@ -652,7 +668,6 @@ static void hppfs_destroy_inode(struct inode *inode) static const struct super_operations hppfs_sbops = { .alloc_inode = hppfs_alloc_inode, .destroy_inode = hppfs_destroy_inode, - .read_inode = hppfs_read_inode, .delete_inode = hppfs_delete_inode, .statfs = hppfs_statfs, }; @@ -745,9 +760,11 @@ static int hppfs_fill_super(struct super_block *sb, void *d, int silent) sb->s_magic = HPPFS_SUPER_MAGIC; sb->s_op = &hppfs_sbops; - root_inode = iget(sb, 0); - if(root_inode == NULL) + root_inode = hppfs_iget(sb); + if (IS_ERR(root_inode)) { + err = PTR_ERR(root_inode); goto out; + } err = init_inode(root_inode, proc_sb->s_root); if(err) -- 2.39.5