diff options
| -rw-r--r-- | fs/autofs4/autofs_i.h | 1 | ||||
| -rw-r--r-- | fs/autofs4/inode.c | 73 |
2 files changed, 74 insertions, 0 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 9c09641ce90..fca83e28edc 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -92,6 +92,7 @@ struct autofs_wait_queue { struct autofs_sb_info { u32 magic; + struct dentry *root; struct file *pipe; pid_t oz_pgrp; int catatonic; diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c index 4bb14cc6804..0a3c05d1016 100644 --- a/fs/autofs4/inode.c +++ b/fs/autofs4/inode.c @@ -16,6 +16,7 @@ #include <linux/pagemap.h> #include <linux/parser.h> #include <linux/bitops.h> +#include <linux/smp_lock.h> #include "autofs_i.h" #include <linux/module.h> @@ -76,6 +77,66 @@ void autofs4_free_ino(struct autofs_info *ino) kfree(ino); } +/* + * Deal with the infamous "Busy inodes after umount ..." message. + * + * Clean up the dentry tree. This happens with autofs if the user + * space program goes away due to a SIGKILL, SIGSEGV etc. + */ +static void autofs4_force_release(struct autofs_sb_info *sbi) +{ + struct dentry *this_parent = sbi->root; + struct list_head *next; + + spin_lock(&dcache_lock); +repeat: + next = this_parent->d_subdirs.next; +resume: + while (next != &this_parent->d_subdirs) { + struct dentry *dentry = list_entry(next, struct dentry, d_child); + + /* Negative dentry - don`t care */ + if (!simple_positive(dentry)) { + next = next->next; + continue; + } + + if (!list_empty(&dentry->d_subdirs)) { + this_parent = dentry; + goto repeat; + } + + next = next->next; + spin_unlock(&dcache_lock); + + DPRINTK("dentry %p %.*s", + dentry, (int)dentry->d_name.len, dentry->d_name.name); + + dput(dentry); + spin_lock(&dcache_lock); + } + + if (this_parent != sbi->root) { + struct dentry *dentry = this_parent; + + next = this_parent->d_child.next; + this_parent = this_parent->d_parent; + spin_unlock(&dcache_lock); + DPRINTK("parent dentry %p %.*s", + dentry, (int)dentry->d_name.len, dentry->d_name.name); + dput(dentry); + spin_lock(&dcache_lock); + 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) { struct autofs_sb_info *sbi = autofs4_sbi(sb); @@ -85,6 +146,10 @@ static void autofs4_put_super(struct super_block *sb) if ( !sbi->catatonic ) autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */ + /* Clean up and release dangling references */ + if (sbi) + autofs4_force_release(sbi); + kfree(sbi); DPRINTK("shutting down"); @@ -199,6 +264,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent) s->s_fs_info = sbi; sbi->magic = AUTOFS_SBI_MAGIC; + sbi->root = NULL; sbi->catatonic = 0; sbi->exp_timeout = 0; sbi->oz_pgrp = process_group(current); @@ -267,6 +333,13 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent) sbi->pipe = pipe; /* + * 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; |