From 62328a02399ea7f1b26b06d757abe67b9cf48193 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 7 Feb 2008 00:15:30 -0800 Subject: iget: stop autofs from using iget() and read_inode() Stop the autofs filesystem from using iget() and read_inode(). Replace autofs_read_inode() with autofs_iget(), and call that instead of iget(). autofs_iget() then uses iget_locked() directly and returns a proper error code instead of an inode in the event of an error. Signed-off-by: David Howells Cc: Ian Kent Acked-by: Christoph Hellwig Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/autofs/autofs_i.h | 1 + fs/autofs/inode.c | 27 ++++++++++++++++++--------- fs/autofs/root.c | 22 ++++++++++++++++++---- 3 files changed, 37 insertions(+), 13 deletions(-) (limited to 'fs/autofs') diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h index 8b4cca3c470..901a3e67ec4 100644 --- a/fs/autofs/autofs_i.h +++ b/fs/autofs/autofs_i.h @@ -150,6 +150,7 @@ extern const struct file_operations autofs_root_operations; int autofs_fill_super(struct super_block *, void *, int); void autofs_kill_sb(struct super_block *sb); +struct inode *autofs_iget(struct super_block *, unsigned long); /* Queue management functions */ diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c index 45f5992a095..708bdb89fea 100644 --- a/fs/autofs/inode.c +++ b/fs/autofs/inode.c @@ -52,10 +52,7 @@ out_kill_sb: kill_anon_super(sb); } -static void autofs_read_inode(struct inode *inode); - static const struct super_operations autofs_sops = { - .read_inode = autofs_read_inode, .statfs = simple_statfs, }; @@ -164,7 +161,9 @@ int autofs_fill_super(struct super_block *s, void *data, int silent) s->s_time_gran = 1; sbi->sb = s; - root_inode = iget(s, AUTOFS_ROOT_INO); + root_inode = autofs_iget(s, AUTOFS_ROOT_INO); + if (IS_ERR(root_inode)) + goto fail_free; root = d_alloc_root(root_inode); pipe = NULL; @@ -230,11 +229,17 @@ fail_unlock: return -EINVAL; } -static void autofs_read_inode(struct inode *inode) +struct inode *autofs_iget(struct super_block *sb, unsigned long ino) { - ino_t ino = inode->i_ino; unsigned int n; - struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb); + struct autofs_sb_info *sbi = autofs_sbi(sb); + struct inode *inode; + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; /* Initialize to the default case (stub directory) */ @@ -250,7 +255,7 @@ static void autofs_read_inode(struct inode *inode) inode->i_op = &autofs_root_inode_operations; inode->i_fop = &autofs_root_operations; inode->i_uid = inode->i_gid = 0; /* Changed in read_super */ - return; + goto done; } inode->i_uid = inode->i_sb->s_root->d_inode->i_uid; @@ -263,7 +268,7 @@ static void autofs_read_inode(struct inode *inode) n = ino - AUTOFS_FIRST_SYMLINK; if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) { printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino); - return; + goto done; } inode->i_op = &autofs_symlink_inode_operations; @@ -275,4 +280,8 @@ static void autofs_read_inode(struct inode *inode) inode->i_size = sl->len; inode->i_nlink = 1; } + +done: + unlock_new_inode(inode); + return inode; } diff --git a/fs/autofs/root.c b/fs/autofs/root.c index 5efff3c0d88..8aacade5695 100644 --- a/fs/autofs/root.c +++ b/fs/autofs/root.c @@ -114,8 +114,8 @@ static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, str dentry->d_time = (unsigned long) ent; if (!dentry->d_inode) { - inode = iget(sb, ent->ino); - if (!inode) { + inode = autofs_iget(sb, ent->ino); + if (IS_ERR(inode)) { /* Failed, but leave pending for next time */ return 1; } @@ -274,6 +274,7 @@ static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const c unsigned int n; int slsize; struct autofs_symlink *sl; + struct inode *inode; DPRINTK(("autofs_root_symlink: %s <- ", symname)); autofs_say(dentry->d_name.name,dentry->d_name.len); @@ -331,7 +332,12 @@ static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const c ent->dentry = NULL; /* We don't keep the dentry for symlinks */ autofs_hash_insert(dh,ent); - d_instantiate(dentry, iget(dir->i_sb,ent->ino)); + + inode = autofs_iget(dir->i_sb, ent->ino); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + d_instantiate(dentry, inode); unlock_kernel(); return 0; } @@ -428,6 +434,7 @@ static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode) struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb); struct autofs_dirhash *dh = &sbi->dirhash; struct autofs_dir_ent *ent; + struct inode *inode; ino_t ino; lock_kernel(); @@ -469,7 +476,14 @@ static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode) autofs_hash_insert(dh,ent); inc_nlink(dir); - d_instantiate(dentry, iget(dir->i_sb,ino)); + + inode = autofs_iget(dir->i_sb, ino); + if (IS_ERR(inode)) { + drop_nlink(dir); + return PTR_ERR(inode); + } + + d_instantiate(dentry, inode); unlock_kernel(); return 0; -- cgit v1.2.3-70-g09d2