From: David Howells AUTOFS: Make sure all dentries refs are released before calling kill_anon_super() Make sure all dentries refs are released before calling kill_anon_super() so that the assumption that generic_shutdown_super() can completely destroy the dentry tree for there will be no external references holds true. What was being done in the put_super() superblock op, is now done in the kill_sb() filesystem op instead, prior to calling kill_anon_super(). This makes the struct autofs_sb_info::root member variable redundant (since sb->s_root is still available), and so that is removed. The calls to shrink_dcache_sb() are also removed since they're also redundant as shrink_dcache_for_umount() will now be called after the cleanup routine. Signed-Off-By: David Howells Signed-off-by: Trond Myklebust --- fs/autofs4/autofs_i.h | 3 +-- fs/autofs4/init.c | 2 +- fs/autofs4/inode.c | 22 ++++------------------ fs/autofs4/waitq.c | 1 - 4 files changed, 6 insertions(+), 22 deletions(-) diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index d6603d0..47e38f3 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -96,7 +96,6 @@ #define AUTOFS_TYPE_OFFSET 0x0004 struct autofs_sb_info { u32 magic; - struct dentry *root; int pipefd; struct file *pipe; pid_t oz_pgrp; @@ -231,4 +230,4 @@ out: } void autofs4_dentry_release(struct dentry *); - +extern void autofs4_kill_sb(struct super_block *); diff --git a/fs/autofs4/init.c b/fs/autofs4/init.c index 5d91933..723a1c5 100644 --- a/fs/autofs4/init.c +++ b/fs/autofs4/init.c @@ -24,7 +24,7 @@ static struct file_system_type autofs_fs .owner = THIS_MODULE, .name = "autofs", .get_sb = autofs_get_sb, - .kill_sb = kill_anon_super, + .kill_sb = autofs4_kill_sb, }; static int __init init_autofs4_fs(void) diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c index fde78b1..1bf68c5 100644 --- a/fs/autofs4/inode.c +++ b/fs/autofs4/inode.c @@ -95,7 +95,7 @@ void autofs4_free_ino(struct autofs_info */ static void autofs4_force_release(struct autofs_sb_info *sbi) { - struct dentry *this_parent = sbi->root; + struct dentry *this_parent = sbi->sb->s_root; struct list_head *next; spin_lock(&dcache_lock); @@ -126,7 +126,7 @@ resume: spin_lock(&dcache_lock); } - if (this_parent != sbi->root) { + if (this_parent != sbi->sb->s_root) { struct dentry *dentry = this_parent; next = this_parent->d_u.d_child.next; @@ -139,15 +139,9 @@ resume: goto resume; } spin_unlock(&dcache_lock); - - dput(sbi->root); - sbi->root = NULL; - shrink_dcache_sb(sbi->sb); - - return; } -static void autofs4_put_super(struct super_block *sb) +void autofs4_kill_sb(struct super_block *sb) { struct autofs_sb_info *sbi = autofs4_sbi(sb); @@ -162,6 +156,7 @@ static void autofs4_put_super(struct sup kfree(sbi); DPRINTK("shutting down"); + kill_anon_super(sb); } static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt) @@ -188,7 +183,6 @@ static int autofs4_show_options(struct s } static struct super_operations autofs4_sops = { - .put_super = autofs4_put_super, .statfs = simple_statfs, .show_options = autofs4_show_options, }; @@ -314,7 +308,6 @@ int autofs4_fill_super(struct super_bloc s->s_fs_info = sbi; sbi->magic = AUTOFS_SBI_MAGIC; - sbi->root = NULL; sbi->pipefd = -1; sbi->catatonic = 0; sbi->exp_timeout = 0; @@ -396,13 +389,6 @@ int autofs4_fill_super(struct super_bloc sbi->pipefd = pipefd; /* - * Take a reference to the root dentry so we get a chance to - * clean up the dentry tree on umount. - * See autofs4_force_release. - */ - sbi->root = dget(root); - - /* * Success! Install the root dentry now to indicate completion. */ s->s_root = root; diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index ce103e7..c0a6c8d 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -45,7 +45,6 @@ void autofs4_catatonic_mode(struct autof fput(sbi->pipe); /* Close the pipe */ sbi->pipe = NULL; } - shrink_dcache_sb(sbi->sb); } static int autofs4_write(struct file *file, const void *addr, int bytes)