diff -Nur linux-2.6.0.orig/fs/Kconfig linux-2.6.0/fs/Kconfig --- linux-2.6.0.orig/fs/Kconfig 2004-04-05 23:21:54.000000000 +0800 +++ linux-2.6.0/fs/Kconfig 2004-05-08 19:48:48.000000000 +0800 @@ -452,7 +452,7 @@ automounter (amd), which is a pure user space daemon. To use the automounter you need the user-space tools from - ; you also + ; you also want to answer Y to "NFS file system support", below. To compile this support as a module, choose M here: the module will be diff -Nur linux-2.6.0.orig/fs/autofs4/autofs_i.h linux-2.6.0/fs/autofs4/autofs_i.h --- linux-2.6.0.orig/fs/autofs4/autofs_i.h 2003-12-18 10:59:05.000000000 +0800 +++ linux-2.6.0/fs/autofs4/autofs_i.h 2004-05-08 19:58:44.000000000 +0800 @@ -25,6 +25,8 @@ #include #include #include +#include +#include #include #include @@ -82,7 +84,7 @@ char *name; /* This is for status reporting upon return */ int status; - int wait_ctr; + atomic_t wait_ctr; }; #define AUTOFS_SBI_MAGIC 0x6d4a556d @@ -93,8 +95,12 @@ pid_t oz_pgrp; int catatonic; int version; + int sub_version; unsigned long exp_timeout; + int reghost_enabled; + int needs_reghost; struct super_block *sb; + struct semaphore wq_sem; struct autofs_wait_queue *queues; /* Wait queue pointer */ }; @@ -125,6 +131,12 @@ (inf != NULL && inf->flags & AUTOFS_INF_EXPIRING); } +static inline void autofs4_copy_atime(struct file *src, struct file *dst) +{ + dst->f_dentry->d_inode->i_atime = src->f_dentry->d_inode->i_atime; + return; +} + struct inode *autofs4_get_inode(struct super_block *, struct autofs_info *); struct autofs_info *autofs4_init_inf(struct autofs_sb_info *, mode_t mode); void autofs4_free_ino(struct autofs_info *); @@ -141,6 +153,7 @@ extern struct inode_operations autofs4_symlink_inode_operations; extern struct inode_operations autofs4_dir_inode_operations; extern struct inode_operations autofs4_root_inode_operations; +extern struct file_operations autofs4_dir_operations; extern struct file_operations autofs4_root_operations; /* Initializing function */ @@ -157,6 +170,24 @@ NFY_EXPIRE }; -int autofs4_wait(struct autofs_sb_info *,struct qstr *, enum autofs_notify); +int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify); int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int); void autofs4_catatonic_mode(struct autofs_sb_info *); + +static inline int simple_positive(struct dentry *dentry) +{ + return dentry->d_inode && !d_unhashed(dentry); +} + +static inline int simple_empty_nolock(struct dentry *dentry) +{ + struct dentry *child; + int ret = 0; + + list_for_each_entry(child, &dentry->d_subdirs, d_child) + if (simple_positive(child)) + goto out; + ret = 1; +out: + return ret; +} diff -Nur linux-2.6.0.orig/fs/autofs4/expire.c linux-2.6.0/fs/autofs4/expire.c --- linux-2.6.0.orig/fs/autofs4/expire.c 2003-12-18 10:59:05.000000000 +0800 +++ linux-2.6.0/fs/autofs4/expire.c 2004-05-08 19:58:44.000000000 +0800 @@ -4,6 +4,7 @@ * * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved * Copyright 1999-2000 Jeremy Fitzhardinge + * Copyright 2001-2003 Ian Kent * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your @@ -12,139 +13,198 @@ * ------------------------------------------------------------------------- */ #include "autofs_i.h" -#include -/* - * Determine if a subtree of the namespace is busy. - * - * mnt is the mount tree under the autofs mountpoint +static unsigned long now; + +/* Check if a dentry can be expired return 1 if it can else return 0 */ +static inline int autofs4_can_expire(struct dentry *dentry, + unsigned long timeout, int do_now) +{ + struct autofs_info *ino = autofs4_dentry_ino(dentry); + + /* dentry in the process of being deleted */ + if (ino == NULL) + return 0; + + /* No point expiring a pending mount */ + if (dentry->d_flags & DCACHE_AUTOFS_PENDING) + return 0; + + if (!do_now) { + /* Too young to die */ + if (time_after(ino->last_used + timeout, now)) + return 0; + + /* update last_used here :- + - obviously makes sense if it is in use now + - less obviously, prevents rapid-fire expire + attempts if expire fails the first time */ + ino->last_used = now; + } + + return 1; +} + +/* Check a mount point for busyness return 1 if not busy, otherwise */ +static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry) +{ + int status = 0; + + DPRINTK(("autofs4_check_mount: dentry %p %.*s\n", + dentry, (int)dentry->d_name.len, dentry->d_name.name)); + + mntget(mnt); + dget(dentry); + + if (!follow_down(&mnt, &dentry)) + goto done; + + while (d_mountpoint(dentry) && follow_down(&mnt, &dentry)) + ; + + /* This is an autofs submount, we can't expire it */ + if (is_autofs4_dentry(dentry)) + goto done; + + /* The big question */ + if (may_umount_tree(mnt) == 0) + status = 1; +done: + DPRINTK(("autofs4_check_mount: returning = %d\n", status)); + mntput(mnt); + dput(dentry); + return status; +} + +/* Check a directory tree of mount points for busyness + * The tree is not busy iff no mountpoints are busy + * Return 1 if the tree is busy or 0 otherwise */ -static inline int is_vfsmnt_tree_busy(struct vfsmount *mnt) +static int autofs4_check_tree(struct vfsmount *mnt, + struct dentry *top, + unsigned long timeout, + int do_now) { - struct vfsmount *this_parent = mnt; + struct dentry *this_parent = top; struct list_head *next; - int count; - count = atomic_read(&mnt->mnt_count) - 1; + DPRINTK(("autofs4_check_tree: parent %p %.*s\n", + top, (int)top->d_name.len, top->d_name.name)); + /* Negative dentry - give up */ + if (!simple_positive(top)) + return 0; + + /* Timeout of a tree mount is determined by its top dentry */ + if (!autofs4_can_expire(top, timeout, do_now)) + return 0; + + spin_lock(&dcache_lock); repeat: - next = this_parent->mnt_mounts.next; - DPRINTK(("is_vfsmnt_tree_busy: mnt=%p, this_parent=%p, next=%p\n", - mnt, this_parent, next)); + next = this_parent->d_subdirs.next; resume: - for( ; next != &this_parent->mnt_mounts; next = next->next) { - struct vfsmount *p = list_entry(next, struct vfsmount, - mnt_child); - - /* -1 for struct vfs_mount's normal count, - -1 to compensate for child's reference to parent */ - count += atomic_read(&p->mnt_count) - 1 - 1; + while (next != &this_parent->d_subdirs) { + struct dentry *dentry = list_entry(next, struct dentry, d_child); - DPRINTK(("is_vfsmnt_tree_busy: p=%p, count now %d\n", - p, count)); + /* Negative dentry - give up */ + if (!simple_positive(dentry)) { + next = next->next; + continue; + } - if (!list_empty(&p->mnt_mounts)) { - this_parent = p; + DPRINTK(("autofs4_check_tree: dentry %p %.*s\n", + dentry, (int)dentry->d_name.len, dentry->d_name.name)); + + if (!simple_empty_nolock(dentry)) { + this_parent = dentry; goto repeat; } - /* root is busy if any leaf is busy */ - if (atomic_read(&p->mnt_count) > 1) - return 1; - } - /* All done at this level ... ascend and resume the search. */ - if (this_parent != mnt) { - next = this_parent->mnt_child.next; - this_parent = this_parent->mnt_parent; - goto resume; - } + dentry = dget(dentry); + spin_unlock(&dcache_lock); - DPRINTK(("is_vfsmnt_tree_busy: count=%d\n", count)); - return count != 0; /* remaining users? */ -} + if (d_mountpoint(dentry)) { + /* First busy => tree busy */ + if (!autofs4_check_mount(mnt, dentry)) { + dput(dentry); + return 0; + } + } -/* Traverse a dentry's list of vfsmounts and return the number of - non-busy mounts */ -static int check_vfsmnt(struct vfsmount *mnt, struct dentry *dentry) -{ - int ret = dentry->d_mounted; - struct vfsmount *vfs = lookup_mnt(mnt, dentry); + dput(dentry); + spin_lock(&dcache_lock); + next = next->next; + } - if (vfs) { - mntput(vfs); - if (is_vfsmnt_tree_busy(vfs)) - ret--; + if (this_parent != top) { + next = this_parent->d_child.next; + this_parent = this_parent->d_parent; + goto resume; } - DPRINTK(("check_vfsmnt: ret=%d\n", ret)); - return ret; + spin_unlock(&dcache_lock); + + return 1; } -/* Check dentry tree for busyness. If a dentry appears to be busy - because it is a mountpoint, check to see if the mounted - filesystem is busy. */ -static int is_tree_busy(struct vfsmount *topmnt, struct dentry *top) +struct dentry *autofs4_check_leaves(struct vfsmount *mnt, + struct dentry *parent, + unsigned long timeout, + int do_now) { - struct dentry *this_parent; + struct dentry *this_parent = parent; struct list_head *next; - int count; - - count = atomic_read(&top->d_count); - - DPRINTK(("is_tree_busy: top=%p initial count=%d\n", - top, count)); - this_parent = top; - - if (is_autofs4_dentry(top)) { - count--; - DPRINTK(("is_tree_busy: autofs; count=%d\n", count)); - } - if (d_mountpoint(top)) - count -= check_vfsmnt(topmnt, top); + DPRINTK(("autofs4_check_leaves: parent %p %.*s\n", + parent, (int)parent->d_name.len, parent->d_name.name)); - repeat: + spin_lock(&dcache_lock); +repeat: next = this_parent->d_subdirs.next; - resume: +resume: while (next != &this_parent->d_subdirs) { - int adj = 0; - struct dentry *dentry = list_entry(next, struct dentry, - d_child); - next = next->next; - - count += atomic_read(&dentry->d_count) - 1; + struct dentry *dentry = list_entry(next, struct dentry, d_child); - if (d_mountpoint(dentry)) - adj += check_vfsmnt(topmnt, dentry); - - if (is_autofs4_dentry(dentry)) { - adj++; - DPRINTK(("is_tree_busy: autofs; adj=%d\n", - adj)); + /* Negative dentry - give up */ + if (!simple_positive(dentry)) { + next = next->next; + continue; } - count -= adj; + DPRINTK(("autofs4_check_leaves: dentry %p %.*s\n", + dentry, (int)dentry->d_name.len, dentry->d_name.name)); if (!list_empty(&dentry->d_subdirs)) { this_parent = dentry; goto repeat; } - if (atomic_read(&dentry->d_count) != adj) { - DPRINTK(("is_tree_busy: busy leaf (d_count=%d adj=%d)\n", - atomic_read(&dentry->d_count), adj)); - return 1; + dentry = dget(dentry); + spin_unlock(&dcache_lock); + + if (d_mountpoint(dentry)) { + /* Can we expire this guy */ + if (!autofs4_can_expire(dentry, timeout, do_now)) + goto cont; + + /* Can we umount this guy */ + if (autofs4_check_mount(mnt, dentry)) + return dentry; + } +cont: + dput(dentry); + spin_lock(&dcache_lock); + next = next->next; } - /* All done at this level ... ascend and resume the search. */ - if (this_parent != top) { - next = this_parent->d_child.next; + if (this_parent != parent) { + next = this_parent->d_child.next; this_parent = this_parent->d_parent; goto resume; } + spin_unlock(&dcache_lock); - DPRINTK(("is_tree_busy: count=%d\n", count)); - return count != 0; /* remaining users? */ + return NULL; } /* @@ -156,61 +216,86 @@ static struct dentry *autofs4_expire(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, - int do_now) + int how) { - unsigned long now = jiffies; unsigned long timeout; struct dentry *root = sb->s_root; - struct list_head *tmp; + struct dentry *expired = NULL; + struct list_head *next; + int do_now = how & AUTOFS_EXP_IMMEDIATE; + int exp_leaves = how & AUTOFS_EXP_LEAVES; - if (!sbi->exp_timeout || !root) + if ( !sbi->exp_timeout || !root ) return NULL; + now = jiffies; timeout = sbi->exp_timeout; spin_lock(&dcache_lock); - for(tmp = root->d_subdirs.next; - tmp != &root->d_subdirs; - tmp = tmp->next) { - struct autofs_info *ino; - struct dentry *dentry = list_entry(tmp, struct dentry, d_child); + next = root->d_subdirs.next; - if (dentry->d_inode == NULL) + /* On exit from the loop expire is set to a dgot dentry + * to expire or it's NULL */ + while ( next != &root->d_subdirs ) { + struct dentry *dentry = list_entry(next, struct dentry, d_child); + + /* Negative dentry - give up */ + if ( !simple_positive(dentry) ) { + next = next->next; continue; + } - ino = autofs4_dentry_ino(dentry); + dentry = dget(dentry); + spin_unlock(&dcache_lock); - if (ino == NULL) { - /* dentry in the process of being deleted */ - continue; + /* Case 1: indirect mount or top level direct mount */ + if (d_mountpoint(dentry)) { + DPRINTK(("autofs4_expire: checking mountpoint %p %.*s\n", + dentry, (int)dentry->d_name.len, dentry->d_name.name)); + + /* Can we expire this guy */ + if (!autofs4_can_expire(dentry, timeout, do_now)) + goto next; + + /* Can we umount this guy */ + if (autofs4_check_mount(mnt, dentry)) { + expired = dentry; + break; + } + goto next; } - /* No point expiring a pending mount */ - if (dentry->d_flags & DCACHE_AUTOFS_PENDING) - continue; + if ( simple_empty(dentry) ) + goto next; - if (!do_now) { - /* Too young to die */ - if (time_after(ino->last_used + timeout, now)) - continue; - - /* update last_used here :- - - obviously makes sense if it is in use now - - less obviously, prevents rapid-fire expire - attempts if expire fails the first time */ - ino->last_used = now; + /* Case 2: tree mount, expire iff entire tree is not busy */ + if (!exp_leaves) { + if (autofs4_check_tree(mnt, dentry, timeout, do_now)) { + expired = dentry; + break; + } + /* Case 3: direct mount, expire individual leaves */ + } else { + expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); + if (expired) { + dput(dentry); + break; + } } - if (!is_tree_busy(mnt, dentry)) { - DPRINTK(("autofs_expire: returning %p %.*s\n", - dentry, (int)dentry->d_name.len, dentry->d_name.name)); - /* Start from here next time */ - list_del(&root->d_subdirs); - list_add(&root->d_subdirs, &dentry->d_child); - dget(dentry); - spin_unlock(&dcache_lock); +next: + dput(dentry); + spin_lock(&dcache_lock); + next = next->next; + } - return dentry; - } + if ( expired ) { + DPRINTK(("autofs4_expire: returning %p %.*s\n", + expired, (int)expired->d_name.len, expired->d_name.name)); + spin_lock(&dcache_lock); + list_del(&expired->d_parent->d_subdirs); + list_add(&expired->d_parent->d_subdirs, &expired->d_child); + spin_unlock(&dcache_lock); + return expired; } spin_unlock(&dcache_lock); @@ -263,7 +348,7 @@ /* This is synchronous because it makes the daemon a little easier */ de_info->flags |= AUTOFS_INF_EXPIRING; - ret = autofs4_wait(sbi, &dentry->d_name, NFY_EXPIRE); + ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); de_info->flags &= ~AUTOFS_INF_EXPIRING; dput(dentry); } diff -Nur linux-2.6.0.orig/fs/autofs4/inode.c linux-2.6.0/fs/autofs4/inode.c --- linux-2.6.0.orig/fs/autofs4/inode.c 2003-12-18 10:59:16.000000000 +0800 +++ linux-2.6.0/fs/autofs4/inode.c 2004-05-08 19:58:44.000000000 +0800 @@ -187,6 +187,7 @@ struct file * pipe; int pipefd; struct autofs_sb_info *sbi; + struct autofs_info *ino; int minproto, maxproto; sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL); @@ -203,6 +204,8 @@ sbi->oz_pgrp = process_group(current); sbi->sb = s; sbi->version = 0; + sbi->sub_version = 0; + init_MUTEX(&sbi->wq_sem); sbi->queues = NULL; s->s_blocksize = 1024; s->s_blocksize_bits = 10; @@ -212,7 +215,14 @@ /* * Get the root inode and dentry, but defer checking for errors. */ - root_inode = autofs4_get_inode(s, autofs4_mkroot(sbi)); + ino = autofs4_mkroot(sbi); + if (!ino) + goto fail_free; + root_inode = autofs4_get_inode(s, ino); + kfree(ino); + if (!root_inode) + goto fail_free; + root_inode->i_op = &autofs4_root_inode_operations; root_inode->i_fop = &autofs4_root_operations; root = d_alloc_root(root_inode); @@ -241,6 +251,7 @@ } sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto; + sbi->sub_version = AUTOFS_PROTO_SUBVERSION; DPRINTK(("autofs: pipe fd = %d, pgrp = %u\n", pipefd, sbi->oz_pgrp)); pipe = fget(pipefd); @@ -311,7 +313,7 @@ if (S_ISDIR(inf->mode)) { inode->i_nlink = 2; inode->i_op = &autofs4_dir_inode_operations; - inode->i_fop = &simple_dir_operations; + inode->i_fop = &autofs4_dir_operations; } else if (S_ISLNK(inf->mode)) { inode->i_size = inf->size; inode->i_op = &autofs4_symlink_inode_operations; diff -Nur linux-2.6.0.orig/fs/autofs4/root.c linux-2.6.0/fs/autofs4/root.c --- linux-2.6.0.orig/fs/autofs4/root.c 2003-12-18 10:58:04.000000000 +0800 +++ linux-2.6.0/fs/autofs4/root.c 2004-05-08 19:58:44.000000000 +0800 @@ -4,6 +4,7 @@ * * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved * Copyright 1999-2000 Jeremy Fitzhardinge + * Copyright 2001-2003 Ian Kent * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your @@ -24,17 +25,28 @@ static int autofs4_dir_rmdir(struct inode *,struct dentry *); static int autofs4_dir_mkdir(struct inode *,struct dentry *,int); static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long); +static int autofs4_dir_open(struct inode *inode, struct file *file); +static int autofs4_dir_close(struct inode *inode, struct file *file); +static int autofs4_dir_readdir(struct file * filp, void * dirent, filldir_t filldir); +static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t filldir); static struct dentry *autofs4_root_lookup(struct inode *,struct dentry *, struct nameidata *); +static int autofs4_dcache_readdir(struct file *, void *, filldir_t); struct file_operations autofs4_root_operations = { .open = dcache_dir_open, .release = dcache_dir_close, - .llseek = dcache_dir_lseek, .read = generic_read_dir, - .readdir = dcache_readdir, + .readdir = autofs4_root_readdir, .ioctl = autofs4_root_ioctl, }; +struct file_operations autofs4_dir_operations = { + .open = autofs4_dir_open, + .release = autofs4_dir_close, + .read = generic_read_dir, + .readdir = autofs4_dir_readdir, +}; + struct inode_operations autofs4_root_inode_operations = { .lookup = autofs4_root_lookup, .unlink = autofs4_dir_unlink, @@ -51,12 +63,37 @@ .rmdir = autofs4_dir_rmdir, }; +static int autofs4_root_readdir(struct file *file, void *dirent, + filldir_t filldir) +{ + struct autofs_sb_info *sbi = autofs4_sbi(file->f_dentry->d_sb); + int oz_mode = autofs4_oz_mode(sbi); + + DPRINTK(("autofs4_root_readdir called, filp->f_pos = %lld\n", + file->f_pos)); + + /* + * Don't set reghost flag if: + * 1) f_pos is larger than zero -- we've already been here. + * 2) we haven't even enabled reghosting in the 1st place. + * 3) this is the daemon doing a readdir + */ + if (oz_mode && file->f_pos == 0 && sbi->reghost_enabled) + sbi->needs_reghost = 1; + + DPRINTK(("autofs4_root_readdir: needs_reghost = %d\n", + sbi->needs_reghost)); + + return autofs4_dcache_readdir(file, dirent, filldir); +} + /* Update usage from here to top of tree, so that scan of top-level directories will give a useful result */ static void autofs4_update_usage(struct dentry *dentry) { struct dentry *top = dentry->d_sb->s_root; + spin_lock(&dcache_lock); for(; dentry != top; dentry = dentry->d_parent) { struct autofs_info *ino = autofs4_dentry_ino(dentry); @@ -65,11 +102,194 @@ ino->last_used = jiffies; } } + spin_unlock(&dcache_lock); +} + +/* + * From 2.4 kernel readdir.c + */ +static int autofs4_dcache_readdir(struct file * filp, void * dirent, filldir_t filldir) +{ + int i; + struct dentry *dentry = filp->f_dentry; + + i = filp->f_pos; + switch (i) { + case 0: + if (filldir(dirent, ".", 1, i, dentry->d_inode->i_ino, DT_DIR) < 0) + break; + i++; + filp->f_pos++; + /* fallthrough */ + case 1: + if (filldir(dirent, "..", 2, i, dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) + break; + i++; + filp->f_pos++; + /* fallthrough */ + default: { + struct list_head *list; + int j = i-2; + + spin_lock(&dcache_lock); + list = dentry->d_subdirs.next; + + for (;;) { + if (list == &dentry->d_subdirs) { + spin_unlock(&dcache_lock); + return 0; + } + if (!j) + break; + j--; + list = list->next; + } + + while(1) { + struct dentry *de = list_entry(list, struct dentry, d_child); + + if (!d_unhashed(de) && de->d_inode) { + spin_unlock(&dcache_lock); + if (filldir(dirent, de->d_name.name, de->d_name.len, filp->f_pos, de->d_inode->i_ino, DT_UNKNOWN) < 0) + break; + spin_lock(&dcache_lock); + } + filp->f_pos++; + list = list->next; + if (list != &dentry->d_subdirs) + continue; + spin_unlock(&dcache_lock); + break; + } + } + } + return 0; +} + +static int autofs4_dir_open(struct inode *inode, struct file *file) +{ + struct dentry *dentry = file->f_dentry; + struct vfsmount *mnt = file->f_vfsmnt; + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + int status; + + DPRINTK(("autofs4_dir_open: file=%p dentry=%p %.*s\n", + file, dentry, dentry->d_name.len, dentry->d_name.name)); + + if (autofs4_oz_mode(sbi)) + goto out; + + if (autofs4_ispending(dentry)) { + DPRINTK(("autofs4_dir_open: dentry busy\n")); + return -EBUSY; + } + + if (!d_mountpoint(dentry) && dentry->d_op && dentry->d_op->d_revalidate) { + struct nameidata nd; + int empty; + + /* In case there are stale directory dentrys from a failed mount */ + spin_lock(&dcache_lock); + empty = list_empty(&dentry->d_subdirs); + spin_unlock(&dcache_lock); + + if (!empty) + d_invalidate(dentry); + + nd.flags = LOOKUP_DIRECTORY; + status = (dentry->d_op->d_revalidate)(dentry, &nd); + + if (!status) + return -ENOENT; + } + + if (d_mountpoint(dentry)) { + struct file *fp = NULL; + struct vfsmount *fp_mnt = mntget(mnt); + struct dentry *fp_dentry = dget(dentry); + + while (follow_down(&fp_mnt, &fp_dentry) && d_mountpoint(fp_dentry)); + + fp = dentry_open(fp_dentry, fp_mnt, file->f_flags); + status = PTR_ERR(fp); + if (IS_ERR(fp)) { + file->private_data = NULL; + return status; + } + file->private_data = fp; + } +out: + return 0; +} + +static int autofs4_dir_close(struct inode *inode, struct file *file) +{ + struct dentry *dentry = file->f_dentry; + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + + DPRINTK(("autofs4_dir_close: file=%p dentry=%p %.*s\n", + file, dentry, dentry->d_name.len, dentry->d_name.name)); + + if (autofs4_oz_mode(sbi)) + goto out; + + if (autofs4_ispending(dentry)) { + DPRINTK(("autofs4_dir_close: dentry busy\n")); + return -EBUSY; + } + + if (d_mountpoint(dentry)) { + struct file *fp = file->private_data; + + if (!fp) + return -ENOENT; + + filp_close(fp, current->files); + file->private_data = NULL; + } +out: + return 0; +} + +static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldir) +{ + struct dentry *dentry = file->f_dentry; + struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); + int status; + + DPRINTK(("autofs4_readdir: file=%p dentry=%p %.*s\n", + file, dentry, dentry->d_name.len, dentry->d_name.name)); + + if (autofs4_oz_mode(sbi)) + goto out; + + if (autofs4_ispending(dentry)) { + DPRINTK(("autofs4_readdir: dentry busy\n")); + return -EBUSY; + } + + if (d_mountpoint(dentry)) { + struct file *fp = file->private_data; + + if (!fp) + return -ENOENT; + + if (!fp->f_op || !fp->f_op->readdir) + goto out; + + status = vfs_readdir(fp, filldir, dirent); + file->f_pos = fp->f_pos; + if (status) + autofs4_copy_atime(file, fp); + return status; + } +out: + return autofs4_dcache_readdir(file, dirent, filldir); } static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, - struct autofs_sb_info *sbi) + struct autofs_sb_info *sbi, int flags) { struct autofs_info *de_info = autofs4_dentry_ino(dentry); int status = 0; @@ -78,11 +298,10 @@ when expiration is done to trigger mount request with a new dentry */ if (de_info && (de_info->flags & AUTOFS_INF_EXPIRING)) { - DPRINTK(("try_to_fill_entry: waiting for expire %p name=%.*s, flags&PENDING=%s de_info=%p de_info->flags=%x\n", - dentry, dentry->d_name.len, dentry->d_name.name, - dentry->d_flags & DCACHE_AUTOFS_PENDING?"t":"f", - de_info, de_info?de_info->flags:0)); - status = autofs4_wait(sbi, &dentry->d_name, NFY_NONE); + DPRINTK(("try_to_fill_entry: waiting for expire %p name=%.*s\n", + dentry, dentry->d_name.len, dentry->d_name.name)); + + status = autofs4_wait(sbi, dentry, NFY_NONE); DPRINTK(("try_to_fill_entry: expire done status=%d\n", status)); @@ -93,11 +312,11 @@ dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode)); /* Wait for a pending mount, triggering one if there isn't one already */ - while(dentry->d_inode == NULL) { - DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s, de_info=%p de_info->flags=%x\n", - dentry->d_name.len, dentry->d_name.name, - de_info, de_info?de_info->flags:0)); - status = autofs4_wait(sbi, &dentry->d_name, NFY_MOUNT); + if (dentry->d_inode == NULL) { + DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s\n", + dentry->d_name.len, dentry->d_name.name)); + + status = autofs4_wait(sbi, dentry, NFY_MOUNT); DPRINTK(("try_to_fill_entry: mount done status=%d\n", status)); @@ -113,19 +332,22 @@ /* Return a negative dentry, but leave it "pending" */ return 1; } - } + /* Trigger mount for path component or follow link */ + } else if (flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) || + current->link_count) { + DPRINTK(("try_to_fill_entry: waiting for mount name=%.*s\n", + dentry->d_name.len, dentry->d_name.name)); - /* If this is an unused directory that isn't a mount point, - bitch at the daemon and fix it in user space */ - spin_lock(&dcache_lock); - if (S_ISDIR(dentry->d_inode->i_mode) && - !d_mountpoint(dentry) && - list_empty(&dentry->d_subdirs)) { - DPRINTK(("try_to_fill_entry: mounting existing dir\n")); - spin_unlock(&dcache_lock); - return autofs4_wait(sbi, &dentry->d_name, NFY_MOUNT) == 0; + dentry->d_flags |= DCACHE_AUTOFS_PENDING; + status = autofs4_wait(sbi, dentry, NFY_MOUNT); + + DPRINTK(("try_to_fill_entry: mount done status=%d\n", status)); + + if (status) { + dentry->d_flags &= ~DCACHE_AUTOFS_PENDING; + return 0; + } } - spin_unlock(&dcache_lock); /* We don't update the usages for the autofs daemon itself, this is necessary for recursive autofs mounts */ @@ -136,25 +358,25 @@ return 1; } - /* * Revalidate is called on every cache lookup. Some of those * cache lookups may actually happen while the dentry is not * yet completely filled in, and revalidate has to delay such * lookups.. */ -static int autofs4_root_revalidate(struct dentry * dentry, struct nameidata *nd) +static int autofs4_revalidate(struct dentry * dentry, struct nameidata *nd) { struct inode * dir = dentry->d_parent->d_inode; struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); int oz_mode = autofs4_oz_mode(sbi); + int flags = nd ? nd->flags : 0; + int status = 1; /* Pending dentry */ if (autofs4_ispending(dentry)) { - if (autofs4_oz_mode(sbi)) - return 1; - else - return try_to_fill_dentry(dentry, dir->i_sb, sbi); + if (!oz_mode) + status = try_to_fill_dentry(dentry, dir->i_sb, sbi, flags); + return status; } /* Negative dentry.. invalidate if "old" */ @@ -166,13 +388,12 @@ if (S_ISDIR(dentry->d_inode->i_mode) && !d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) { - DPRINTK(("autofs_root_revalidate: dentry=%p %.*s, emptydir\n", + DPRINTK(("autofs4_root_revalidate: dentry=%p %.*s, emptydir\n", dentry, dentry->d_name.len, dentry->d_name.name)); spin_unlock(&dcache_lock); - if (oz_mode) - return 1; - else - return try_to_fill_dentry(dentry, dir->i_sb, sbi); + if (!oz_mode) + status = try_to_fill_dentry(dentry, dir->i_sb, sbi, flags); + return status; } spin_unlock(&dcache_lock); @@ -183,16 +404,6 @@ return 1; } -static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd) -{ - struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); - - if (!autofs4_oz_mode(sbi)) - autofs4_update_usage(dentry); - - return 1; -} - static void autofs4_dentry_release(struct dentry *de) { struct autofs_info *inf; @@ -212,7 +423,7 @@ /* For dentries of directories in the root dir */ static struct dentry_operations autofs4_root_dentry_operations = { - .d_revalidate = autofs4_root_revalidate, + .d_revalidate = autofs4_revalidate, .d_release = autofs4_dentry_release, }; @@ -224,11 +435,10 @@ /* Lookups in non-root dirs never find anything - if it's there, it's already in the dcache */ -/* SMP-safe */ static struct dentry *autofs4_dir_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { #if 0 - DPRINTK(("autofs_dir_lookup: ignoring lookup of %.*s/%.*s\n", + DPRINTK(("autofs4_dir_lookup: iignoring lookup of %.*s/%.*s\n", dentry->d_parent->d_name.len, dentry->d_parent->d_name.name, dentry->d_name.len, dentry->d_name.name)); #endif @@ -244,7 +454,7 @@ struct autofs_sb_info *sbi; int oz_mode; - DPRINTK(("autofs_root_lookup: name = %.*s\n", + DPRINTK(("autofs4_root_lookup: name = %.*s\n", dentry->d_name.len, dentry->d_name.name)); if (dentry->d_name.len > NAME_MAX) @@ -252,9 +462,8 @@ sbi = autofs4_sbi(dir->i_sb); - lock_kernel(); oz_mode = autofs4_oz_mode(sbi); - DPRINTK(("autofs_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n", + DPRINTK(("autofs4_lookup: pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d\n", current->pid, process_group(current), sbi->catatonic, oz_mode)); /* @@ -285,12 +494,16 @@ * a signal. If so we can force a restart.. */ if (dentry->d_flags & DCACHE_AUTOFS_PENDING) { + /* See if we were interrupted */ if (signal_pending(current)) { - unlock_kernel(); - return ERR_PTR(-ERESTARTNOINTR); + sigset_t *sigset = ¤t->pending.signal; + if (sigismember (sigset, SIGKILL) || + sigismember (sigset, SIGQUIT) || + sigismember (sigset, SIGINT)) { + return ERR_PTR(-ERESTARTNOINTR); + } } } - unlock_kernel(); /* * If this dentry is unhashed, then we shouldn't honour this @@ -313,27 +526,21 @@ struct inode *inode; char *cp; - DPRINTK(("autofs_dir_symlink: %s <- %.*s\n", symname, + DPRINTK(("autofs4_dir_symlink: %s <- %.*s\n", symname, dentry->d_name.len, dentry->d_name.name)); - lock_kernel(); - if (!autofs4_oz_mode(sbi)) { - unlock_kernel(); + if (!autofs4_oz_mode(sbi)) return -EACCES; - } ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555); - if (ino == NULL) { - unlock_kernel(); + if (ino == NULL) return -ENOSPC; - } ino->size = strlen(symname); ino->u.symlink = cp = kmalloc(ino->size + 1, GFP_KERNEL); if (cp == NULL) { kfree(ino); - unlock_kernel(); return -ENOSPC; } @@ -353,7 +560,6 @@ dir->i_mtime = CURRENT_TIME; - unlock_kernel(); return 0; } @@ -370,7 +576,7 @@ * If a process is blocked on the dentry waiting for the expire to finish, * it will invalidate the dentry and try to mount with a new one. * - * Also see autofs_dir_rmdir().. + * Also see autofs4_dir_rmdir().. */ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) { @@ -378,11 +584,8 @@ struct autofs_info *ino = autofs4_dentry_ino(dentry); /* This allows root to remove symlinks */ - lock_kernel(); - if ( !autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN) ) { - unlock_kernel(); + if ( !autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN) ) return -EACCES; - } dput(ino->dentry); @@ -393,8 +596,6 @@ d_drop(dentry); - unlock_kernel(); - return 0; } @@ -403,16 +604,12 @@ struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); - lock_kernel(); - if (!autofs4_oz_mode(sbi)) { - unlock_kernel(); + if (!autofs4_oz_mode(sbi)) return -EACCES; - } spin_lock(&dcache_lock); if (!list_empty(&dentry->d_subdirs)) { spin_unlock(&dcache_lock); - unlock_kernel(); return -ENOTEMPTY; } __d_drop(dentry); @@ -426,32 +623,24 @@ if (dir->i_nlink) dir->i_nlink--; - unlock_kernel(); return 0; } - - static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) { struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); struct inode *inode; - lock_kernel(); - if ( !autofs4_oz_mode(sbi) ) { - unlock_kernel(); + if ( !autofs4_oz_mode(sbi) ) return -EACCES; - } - DPRINTK(("autofs_dir_mkdir: dentry %p, creating %.*s\n", + DPRINTK(("autofs4_dir_mkdir: dentry %p, creating %.*s\n", dentry, dentry->d_name.len, dentry->d_name.name)); ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555); - if (ino == NULL) { - unlock_kernel(); + if (ino == NULL) return -ENOSPC; - } inode = autofs4_get_inode(dir->i_sb, ino); d_instantiate(dentry, inode); @@ -467,7 +656,6 @@ dir->i_nlink++; dir->i_mtime = CURRENT_TIME; - unlock_kernel(); return 0; } @@ -496,7 +684,68 @@ return put_user(sbi->version, p); } -/* Identify autofs_dentries - this is so we can tell if there's +/* Return protocol sub version */ +static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int *p) +{ + return put_user(sbi->sub_version, p); +} + +/* + * Tells the daemon whether we need to reghost or not. Also, clears + * the reghost_needed flag. + */ +static inline int autofs4_ask_reghost(struct autofs_sb_info *sbi, int *p) +{ + int status; + + DPRINTK(("autofs_ask_reghost: returning %d\n", sbi->needs_reghost)); + + status = put_user(sbi->needs_reghost, p); + if ( status ) + return status; + + sbi->needs_reghost = 0; + return 0; +} + +/* + * Enable / Disable reghosting ioctl() operation + */ +static inline int autofs4_toggle_reghost(struct autofs_sb_info *sbi, int *p) +{ + int status; + int val; + + status = get_user(val, p); + + DPRINTK(("autofs4_toggle_reghost: reghost = %d\n", val)); + + if (status) + return status; + + /* turn on/off reghosting, with the val */ + sbi->reghost_enabled = val; + return 0; +} + +/* +* Tells the daemon whether it can umount the autofs mount. +*/ +static inline int autofs4_ask_umount(struct vfsmount *mnt, int *p) +{ + int status = 0; + + if (may_umount(mnt) == 0) + status = 1; + + DPRINTK(("autofs_ask_umount: returning %d\n", status)); + + status = put_user(status, p); + + return status; +} + +/* Identify autofs4_dentries - this is so we can tell if there's an extra dentry refcount or not. We only hold a refcount on the dentry if its non-negative (ie, d_inode != NULL) */ @@ -517,7 +766,7 @@ { struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb); - DPRINTK(("autofs_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n", + DPRINTK(("autofs4_root_ioctl: cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u\n", cmd,arg,sbi,process_group(current))); if ( _IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) || @@ -537,9 +786,19 @@ return 0; case AUTOFS_IOC_PROTOVER: /* Get protocol version */ return autofs4_get_protover(sbi, (int *)arg); + case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */ + return autofs4_get_protosubver(sbi, (int *)arg); case AUTOFS_IOC_SETTIMEOUT: return autofs4_get_set_timeout(sbi,(unsigned long *)arg); + case AUTOFS_IOC_TOGGLEREGHOST: + return autofs4_toggle_reghost(sbi, (int *) arg); + case AUTOFS_IOC_ASKREGHOST: + return autofs4_ask_reghost(sbi, (int *) arg); + + case AUTOFS_IOC_ASKUMOUNT: + return autofs4_ask_umount(filp->f_vfsmnt, (int *) arg); + /* return a single thing to expire */ case AUTOFS_IOC_EXPIRE: return autofs4_expire_run(inode->i_sb,filp->f_vfsmnt,sbi, diff -Nur linux-2.6.0.orig/fs/autofs4/waitq.c linux-2.6.0/fs/autofs4/waitq.c --- linux-2.6.0.orig/fs/autofs4/waitq.c 2003-12-18 10:59:41.000000000 +0800 +++ linux-2.6.0/fs/autofs4/waitq.c 2004-05-08 19:58:44.000000000 +0800 @@ -3,6 +3,7 @@ * linux/fs/autofs/waitq.c * * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved + * Copyright 2001-2003 Ian Kent * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your @@ -37,7 +38,7 @@ wq->status = -ENOENT; /* Magic is gone - report failure */ kfree(wq->name); wq->name = NULL; - wake_up(&wq->queue); + wake_up_interruptible(&wq->queue); wq = nwq; } if (sbi->pipe) { @@ -90,7 +91,7 @@ union autofs_packet_union pkt; size_t pktsz; - DPRINTK(("autofs_notify: wait id = 0x%08lx, name = %.*s, type=%d\n", + DPRINTK(("autofs4_notify_daemon: wait id = 0x%08lx, name = %.*s, type=%d\n", wq->wait_queue_token, wq->len, wq->name, type)); memset(&pkt,0,sizeof pkt); /* For security reasons */ @@ -116,7 +117,7 @@ memcpy(ep->name, wq->name, wq->len); ep->name[wq->len] = '\0'; } else { - printk("autofs_notify_daemon: bad type %d!\n", type); + printk("autofs4_notify_daemon: bad type %d!\n", type); return; } @@ -124,62 +125,107 @@ autofs4_catatonic_mode(sbi); } -int autofs4_wait(struct autofs_sb_info *sbi, struct qstr *name, +static int autofs4_getpath(struct autofs_sb_info *sbi, + struct dentry *dentry, char **name) +{ + struct dentry *root = sbi->sb->s_root; + struct dentry *tmp; + char *buf = *name; + char *p; + int len = 0; + + spin_lock(&dcache_lock); + for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) + len += tmp->d_name.len + 1; + + if (--len > NAME_MAX) { + spin_unlock(&dcache_lock); + return 0; + } + + *(buf + len) = '\0'; + p = buf + len - dentry->d_name.len; + strncpy(p, dentry->d_name.name, dentry->d_name.len); + + for (tmp = dentry->d_parent; tmp != root ; tmp = tmp->d_parent) { + *(--p) = '/'; + p -= tmp->d_name.len; + strncpy(p, tmp->d_name.name, tmp->d_name.len); + } + spin_unlock(&dcache_lock); + + return len; +} + +int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, enum autofs_notify notify) { struct autofs_wait_queue *wq; - int status; + char *name; + int len, status; /* In catatonic mode, we don't wait for nobody */ if ( sbi->catatonic ) return -ENOENT; - /* We shouldn't be able to get here, but just in case */ - if ( name->len > NAME_MAX ) + name = kmalloc(NAME_MAX + 1, GFP_KERNEL); + if (!name) + return -ENOMEM; + + len = autofs4_getpath(sbi, dentry, &name); + if (!len) { + kfree(name); return -ENOENT; + } - for ( wq = sbi->queues ; wq ; wq = wq->next ) { - if ( wq->hash == name->hash && - wq->len == name->len && - wq->name && !memcmp(wq->name,name->name,name->len) ) + if (down_interruptible(&sbi->wq_sem)) { + kfree(name); + return -EINTR; + } + + for (wq = sbi->queues ; wq ; wq = wq->next) { + if (wq->hash == dentry->d_name.hash && + wq->len == len && + wq->name && !memcmp(wq->name, name, len)) break; } - + if ( !wq ) { /* Create a new wait queue */ wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL); - if ( !wq ) - return -ENOMEM; - - wq->name = kmalloc(name->len,GFP_KERNEL); - if ( !wq->name ) { - kfree(wq); + if ( !wq ) { + kfree(name); + up(&sbi->wq_sem); return -ENOMEM; } + wq->wait_queue_token = autofs4_next_wait_queue; if (++autofs4_next_wait_queue == 0) autofs4_next_wait_queue = 1; - init_waitqueue_head(&wq->queue); - wq->hash = name->hash; - wq->len = name->len; - wq->status = -EINTR; /* Status return if interrupted */ - memcpy(wq->name, name->name, name->len); wq->next = sbi->queues; sbi->queues = wq; + init_waitqueue_head(&wq->queue); + wq->hash = dentry->d_name.hash; + wq->name = name; + wq->len = len; + wq->status = -EINTR; /* Status return if interrupted */ + atomic_set(&wq->wait_ctr, 2); + up(&sbi->wq_sem); - DPRINTK(("autofs_wait: new wait id = 0x%08lx, name = %.*s, nfy=%d\n", - wq->wait_queue_token, wq->len, wq->name, notify)); + DPRINTK(("autofs4_wait: new wait id = 0x%08lx, name = %.*s, nfy=%d\n", + (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify)); /* autofs4_notify_daemon() may block */ - wq->wait_ctr = 2; if (notify != NFY_NONE) { autofs4_notify_daemon(sbi,wq, - notify == NFY_MOUNT ? autofs_ptype_missing : - autofs_ptype_expire_multi); + notify == NFY_MOUNT ? + autofs_ptype_missing : + autofs_ptype_expire_multi); } } else { - wq->wait_ctr++; - DPRINTK(("autofs_wait: existing wait id = 0x%08lx, name = %.*s, nfy=%d\n", - wq->wait_queue_token, wq->len, wq->name, notify)); + atomic_inc(&wq->wait_ctr); + up(&sbi->wq_sem); + DPRINTK(("autofs4_wait: existing wait id = 0x%08lx, name = %.*s, nfy=%d\n", + (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify)); } /* wq->name is NULL if and only if the lock is already released */ @@ -204,19 +250,20 @@ recalc_sigpending(); spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); - interruptible_sleep_on(&wq->queue); + wait_event_interruptible(wq->queue, wq->name == NULL); spin_lock_irqsave(¤t->sighand->siglock, irqflags); current->blocked = oldset; recalc_sigpending(); spin_unlock_irqrestore(¤t->sighand->siglock, irqflags); } else { - DPRINTK(("autofs_wait: skipped sleeping\n")); + DPRINTK(("autofs4_wait: skipped sleeping\n")); } status = wq->status; - if (--wq->wait_ctr == 0) /* Are we the last process to need status? */ + /* Are we the last process to need status? */ + if (atomic_dec_and_test(&wq->wait_ctr)) kfree(wq); return status; @@ -227,23 +274,28 @@ { struct autofs_wait_queue *wq, **wql; + down(&sbi->wq_sem); for ( wql = &sbi->queues ; (wq = *wql) ; wql = &wq->next ) { if ( wq->wait_queue_token == wait_queue_token ) break; } - if ( !wq ) + + if ( !wq ) { + up(&sbi->wq_sem); return -EINVAL; + } *wql = wq->next; /* Unlink from chain */ + up(&sbi->wq_sem); kfree(wq->name); wq->name = NULL; /* Do not wait on this queue */ wq->status = status; - if (--wq->wait_ctr == 0) /* Is anyone still waiting for this guy? */ + if (atomic_dec_and_test(&wq->wait_ctr)) /* Is anyone still waiting for this guy? */ kfree(wq); else - wake_up(&wq->queue); + wake_up_interruptible(&wq->queue); return 0; } diff -Nur linux-2.6.0.orig/fs/namespace.c linux-2.6.0/fs/namespace.c --- linux-2.6.0.orig/fs/namespace.c 2004-05-08 19:45:13.000000000 +0800 +++ linux-2.6.0/fs/namespace.c 2004-05-08 19:57:51.000000000 +0800 @@ -251,7 +260,65 @@ .show = show_vfsmnt }; -/* +/** + * may_umount_tree - check if a mount tree is busy + * @mnt: root of mount tree + * + * This is called to check if a tree of mounts has any + * open files, pwds, chroots or sub mounts that are + * busy. + */ +int may_umount_tree(struct vfsmount *mnt) +{ + struct list_head *next; + struct vfsmount *this_parent = mnt; + int actual_refs; + int minimum_refs; + + spin_lock(&vfsmount_lock); + actual_refs = atomic_read(&mnt->mnt_count); + minimum_refs = 2; +repeat: + next = this_parent->mnt_mounts.next; +resume: + while (next != &this_parent->mnt_mounts) { + struct vfsmount *p = list_entry(next, struct vfsmount, mnt_child); + + next = next->next; + + actual_refs += atomic_read(&p->mnt_count); + minimum_refs += 2; + + if (!list_empty(&p->mnt_mounts)) { + this_parent = p; + goto repeat; + } + } + + if (this_parent != mnt) { + next = this_parent->mnt_child.next; + this_parent = this_parent->mnt_parent; + goto resume; + } + spin_unlock(&vfsmount_lock); + + if (actual_refs > minimum_refs) + return -EBUSY; + + return 0; +} + +EXPORT_SYMBOL(may_umount_tree); + +/** + * may_umount - check if a mount point is busy + * @mnt: root of mount + * + * This is called to check if a mount point has any + * open files, pwds, chroots or sub mounts. If the + * mount has sub mounts this will return busy + * regardless of whether the sub mounts are busy. + * * Doesn't take quota and stuff into account. IOW, in some cases it will * give false negatives. The main reason why it's here is that we need * a non-destructive way to look for easily umountable filesystems. diff -Nur linux-2.6.0.orig/include/linux/auto_fs4.h linux-2.6.0/include/linux/auto_fs4.h --- linux-2.6.0.orig/include/linux/auto_fs4.h 2003-12-18 10:58:07.000000000 +0800 +++ linux-2.6.0/include/linux/auto_fs4.h 2004-05-08 19:58:28.000000000 +0800 @@ -23,6 +23,12 @@ #define AUTOFS_MIN_PROTO_VERSION 3 #define AUTOFS_MAX_PROTO_VERSION 4 +#define AUTOFS_PROTO_SUBVERSION 5 + +/* Mask for expire behaviour */ +#define AUTOFS_EXP_IMMEDIATE 1 +#define AUTOFS_EXP_LEAVES 2 + /* New message type */ #define autofs_ptype_expire_multi 2 /* Expire entry (umount request) */ @@ -41,7 +47,11 @@ struct autofs_packet_expire_multi expire_multi; }; -#define AUTOFS_IOC_EXPIRE_MULTI _IOW(0x93,0x66,int) +#define AUTOFS_IOC_EXPIRE_MULTI _IOW(0x93,0x66,int) +#define AUTOFS_IOC_PROTOSUBVER _IOR(0x93,0x67,int) +#define AUTOFS_IOC_ASKREGHOST _IOR(0x93,0x68,int) +#define AUTOFS_IOC_TOGGLEREGHOST _IOR(0x93,0x69,int) +#define AUTOFS_IOC_ASKUMOUNT _IOR(0x93,0x70,int) #endif /* _LINUX_AUTO_FS4_H */ diff -Nur linux-2.6.0.orig/include/linux/fs.h linux-2.6.0/include/linux/fs.h --- linux-2.6.0.orig/include/linux/fs.h 2004-05-08 19:44:51.000000000 +0800 +++ linux-2.6.0/include/linux/fs.h 2004-05-08 20:01:53.000000000 +0800 @@ -1042,6 +1042,7 @@ extern int register_filesystem(struct file_system_type *); extern int unregister_filesystem(struct file_system_type *); extern struct vfsmount *kern_mount(struct file_system_type *); +extern int may_umount_tree(struct vfsmount *); extern int may_umount(struct vfsmount *); extern long do_mount(char *, char *, char *, unsigned long, void *);