static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, struct dentry *parent, unsigned long timeout, int do_now) { struct dentry *this_parent = parent; struct list_head *next; DPRINTK("parent %p %.*s", parent, (int)parent->d_name.len, parent->d_name.name); 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_u.d_child); /* Negative dentry - give up */ if (!simple_positive(dentry)) { next = next->next; continue; } DPRINTK("dentry %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); if (!list_empty(&dentry->d_subdirs)) { this_parent = dentry; goto repeat; } 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; } if (this_parent != parent) { next = this_parent->d_u.d_child.next; this_parent = this_parent->d_parent; goto resume; } spin_unlock(&dcache_lock); return NULL; }
static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, struct dentry *parent, unsigned long timeout, int do_now) { struct dentry *p; pr_debug("parent %p %pd\n", parent, parent); p = NULL; while ((p = get_next_positive_dentry(p, parent))) { pr_debug("dentry %p %pd\n", p, p); if (d_mountpoint(p)) { /* Can we umount this guy */ if (autofs4_mount_busy(mnt, p)) continue; /* Can we expire this guy */ if (autofs4_can_expire(p, timeout, do_now)) return p; } } return NULL; }
static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, struct dentry *parent, unsigned long timeout, int do_now) { struct dentry *p; DPRINTK("parent %p %.*s", parent, (int)parent->d_name.len, parent->d_name.name); p = NULL; while ((p = get_next_positive_dentry(p, parent))) { DPRINTK("dentry %p %.*s", p, (int) p->d_name.len, p->d_name.name); if (d_mountpoint(p)) { if (autofs4_mount_busy(mnt, p)) continue; if (autofs4_can_expire(p, timeout, do_now)) return p; } } return NULL; }
/* * Check a directory tree of mount points for busyness * The tree is not busy iff no mountpoints are busy */ static int autofs4_tree_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { struct autofs_info *top_ino = autofs4_dentry_ino(top); struct dentry *p; pr_debug("top %p %pd\n", top, top); /* Negative dentry - give up */ if (!simple_positive(top)) return 1; p = NULL; while ((p = get_next_positive_dentry(p, top))) { pr_debug("dentry %p %pd\n", p, p); /* * Is someone visiting anywhere in the subtree ? * If there's no mount we need to check the usage * count for the autofs dentry. * If the fs is busy update the expiry counter. */ if (d_mountpoint(p)) { if (autofs4_mount_busy(mnt, p)) { top_ino->last_used = jiffies; dput(p); return 1; } } else { struct autofs_info *ino = autofs4_dentry_ino(p); unsigned int ino_count = atomic_read(&ino->count); /* allow for dget above and top is already dgot */ if (p == top) ino_count += 2; else ino_count++; if (d_count(p) > ino_count) { top_ino->last_used = jiffies; dput(p); return 1; } } } /* Timeout of a tree mount is ultimately determined by its top dentry */ if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }
static int autofs4_tree_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { struct autofs_info *top_ino = autofs4_dentry_ino(top); struct dentry *p; DPRINTK("top %p %.*s", top, (int)top->d_name.len, top->d_name.name); if (!simple_positive(top)) return 1; p = NULL; while ((p = get_next_positive_dentry(p, top))) { DPRINTK("dentry %p %.*s", p, (int) p->d_name.len, p->d_name.name); if (d_mountpoint(p)) { if (autofs4_mount_busy(mnt, p)) { top_ino->last_used = jiffies; dput(p); return 1; } } else { struct autofs_info *ino = autofs4_dentry_ino(p); unsigned int ino_count = atomic_read(&ino->count); d_invalidate(p); if (p == top) ino_count += 2; else ino_count++; if (p->d_count > ino_count) { top_ino->last_used = jiffies; dput(p); return 1; } } } if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }
/* * Check a direct mount point for busyness. * Direct mounts have similar expiry semantics to tree mounts. * The tree is not busy iff no mountpoints are busy and there are no * autofs submounts. */ static int autofs4_direct_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { DPRINTK("top %p %.*s", top, (int) top->d_name.len, top->d_name.name); /* If it's busy update the expiry counters */ if (!may_umount_tree(mnt)) { struct autofs_info *ino = autofs4_dentry_ino(top); if (ino) ino->last_used = jiffies; return 1; } /* Timeout of a direct mount is determined by its top dentry */ if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }
static int autofs4_direct_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { DPRINTK("top %p %.*s", top, (int) top->d_name.len, top->d_name.name); if (!may_umount_tree(mnt)) { struct autofs_info *ino = autofs4_dentry_ino(top); if (ino) ino->last_used = jiffies; return 1; } if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }
static struct dentry *autofs4_check_leaves(struct vfsmount *mnt, struct dentry *parent, unsigned long timeout, int do_now) { struct dentry *p; DPRINTK("parent %p %.*s", parent, (int)parent->d_name.len, parent->d_name.name); spin_lock(&dcache_lock); for (p = parent; p; p = next_dentry(p, parent)) { /* Negative dentry - give up */ if (!simple_positive(p)) continue; DPRINTK("dentry %p %.*s", p, (int) p->d_name.len, p->d_name.name); p = dget(p); spin_unlock(&dcache_lock); if (d_mountpoint(p)) { /* Can we umount this guy */ if (autofs4_mount_busy(mnt, p)) goto cont; /* Can we expire this guy */ if (autofs4_can_expire(p, timeout, do_now)) return p; } cont: dput(p); spin_lock(&dcache_lock); } spin_unlock(&dcache_lock); return NULL; }
/* 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 int autofs4_check_tree(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { struct dentry *this_parent = top; struct list_head *next; DPRINTK("parent %p %.*s", 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; /* Is someone visiting anywhere in the tree ? */ if (may_umount_tree(mnt)) return 0; 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_u.d_child); /* Negative dentry - give up */ if (!simple_positive(dentry)) { next = next->next; continue; } DPRINTK("dentry %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); if (!simple_empty_nolock(dentry)) { this_parent = dentry; goto repeat; } dentry = dget(dentry); spin_unlock(&dcache_lock); if (d_mountpoint(dentry)) { /* First busy => tree busy */ if (!autofs4_check_mount(mnt, dentry)) { dput(dentry); return 0; } } dput(dentry); spin_lock(&dcache_lock); next = next->next; } if (this_parent != top) { next = this_parent->d_u.d_child.next; this_parent = this_parent->d_parent; goto resume; } spin_unlock(&dcache_lock); return 1; }
/* * Find an eligible tree to time-out * A tree is eligible if :- * - it is unused by any user process * - it has been unused for exp_timeout time */ static struct dentry *autofs4_expire(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how) { unsigned long timeout; struct dentry *root = sb->s_root; 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 ) return NULL; now = jiffies; timeout = sbi->exp_timeout; spin_lock(&dcache_lock); next = root->d_subdirs.next; /* 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_u.d_child); /* Negative dentry - give up */ if ( !simple_positive(dentry) ) { next = next->next; continue; } dentry = dget(dentry); spin_unlock(&dcache_lock); /* Case 1: indirect mount or top level direct mount */ if (d_mountpoint(dentry)) { DPRINTK("checking mountpoint %p %.*s", 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; } if ( simple_empty(dentry) ) goto next; /* Case 2: tree mount, expire iff entire tree is not busy */ if (!exp_leaves) { /* Lock the tree as we must expire as a whole */ spin_lock(&sbi->fs_lock); if (autofs4_check_tree(mnt, dentry, timeout, do_now)) { struct autofs_info *inf = autofs4_dentry_ino(dentry); /* Set this flag early to catch sys_chdir and the like */ inf->flags |= AUTOFS_INF_EXPIRING; spin_unlock(&sbi->fs_lock); expired = dentry; break; } spin_unlock(&sbi->fs_lock); /* Case 3: direct mount, expire individual leaves */ } else { expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); if (expired) { dput(dentry); break; } } next: dput(dentry); spin_lock(&dcache_lock); next = next->next; } if ( expired ) { DPRINTK("returning %p %.*s", 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_u.d_child); spin_unlock(&dcache_lock); return expired; } spin_unlock(&dcache_lock); return NULL; }
/* Check if 'dentry' should expire, or return a nearby * dentry that is suitable. * If returned dentry is different from arg dentry, * then a dget() reference was taken, else not. */ static struct dentry *should_expire(struct dentry *dentry, struct vfsmount *mnt, unsigned long timeout, int how) { int do_now = how & AUTOFS_EXP_IMMEDIATE; int exp_leaves = how & AUTOFS_EXP_LEAVES; struct autofs_info *ino = autofs4_dentry_ino(dentry); unsigned int ino_count; /* No point expiring a pending mount */ if (ino->flags & AUTOFS_INF_PENDING) return NULL; /* * Case 1: (i) indirect mount or top level pseudo direct mount * (autofs-4.1). * (ii) indirect mount with offset mount, check the "/" * offset (autofs-5.0+). */ if (d_mountpoint(dentry)) { pr_debug("checking mountpoint %p %pd\n", dentry, dentry); /* Can we umount this guy */ if (autofs4_mount_busy(mnt, dentry)) return NULL; /* Can we expire this guy */ if (autofs4_can_expire(dentry, timeout, do_now)) return dentry; return NULL; } if (d_really_is_positive(dentry) && d_is_symlink(dentry)) { pr_debug("checking symlink %p %pd\n", dentry, dentry); /* * A symlink can't be "busy" in the usual sense so * just check last used for expire timeout. */ if (autofs4_can_expire(dentry, timeout, do_now)) return dentry; return NULL; } if (simple_empty(dentry)) return NULL; /* Case 2: tree mount, expire iff entire tree is not busy */ if (!exp_leaves) { /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 1; if (d_count(dentry) > ino_count) return NULL; if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) return dentry; /* * Case 3: pseudo direct mount, expire individual leaves * (autofs-4.1). */ } else { /* Path walk currently on this dentry? */ struct dentry *expired; ino_count = atomic_read(&ino->count) + 1; if (d_count(dentry) > ino_count) return NULL; expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); if (expired) { if (expired == dentry) dput(dentry); return expired; } } return NULL; }
struct dentry *autofs4_expire_indirect(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how) { unsigned long timeout; struct dentry *root = sb->s_root; struct dentry *dentry; struct dentry *expired = NULL; int do_now = how & AUTOFS_EXP_IMMEDIATE; int exp_leaves = how & AUTOFS_EXP_LEAVES; struct autofs_info *ino; unsigned int ino_count; if (!root) return NULL; now = jiffies; timeout = sbi->exp_timeout; dentry = NULL; while ((dentry = get_next_positive_subdir(dentry, root))) { spin_lock(&sbi->fs_lock); ino = autofs4_dentry_ino(dentry); if (ino->flags & AUTOFS_INF_PENDING) goto next; if (d_mountpoint(dentry)) { DPRINTK("checking mountpoint %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); ino_count = atomic_read(&ino->count) + 2; if (dentry->d_count > ino_count) goto next; if (autofs4_mount_busy(mnt, dentry)) goto next; if (autofs4_can_expire(dentry, timeout, do_now)) { expired = dentry; goto found; } goto next; } if (simple_empty(dentry)) goto next; if (!exp_leaves) { ino_count = atomic_read(&ino->count) + 1; if (dentry->d_count > ino_count) goto next; if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { expired = dentry; goto found; } } else { ino_count = atomic_read(&ino->count) + 1; if (dentry->d_count > ino_count) goto next; expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); if (expired) { dput(dentry); goto found; } } next: spin_unlock(&sbi->fs_lock); } return NULL; found: DPRINTK("returning %p %.*s", expired, (int)expired->d_name.len, expired->d_name.name); ino = autofs4_dentry_ino(expired); ino->flags |= AUTOFS_INF_EXPIRING; init_completion(&ino->expire_complete); spin_unlock(&sbi->fs_lock); spin_lock(&sbi->lookup_lock); spin_lock(&expired->d_parent->d_lock); spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); spin_unlock(&expired->d_lock); spin_unlock(&expired->d_parent->d_lock); spin_unlock(&sbi->lookup_lock); return expired; }
/* * Find an eligible tree to time-out * A tree is eligible if :- * - it is unused by any user process * - it has been unused for exp_timeout time */ struct dentry *autofs4_expire_indirect(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how) { unsigned long timeout; struct dentry *root = sb->s_root; struct dentry *dentry; struct dentry *expired = NULL; int do_now = how & AUTOFS_EXP_IMMEDIATE; int exp_leaves = how & AUTOFS_EXP_LEAVES; struct autofs_info *ino; unsigned int ino_count; if (!root) return NULL; now = jiffies; timeout = sbi->exp_timeout; dentry = NULL; while ((dentry = get_next_positive_subdir(dentry, root))) { spin_lock(&sbi->fs_lock); ino = autofs4_dentry_ino(dentry); /* No point expiring a pending mount */ if (ino->flags & AUTOFS_INF_PENDING) goto next; /* * Case 1: (i) indirect mount or top level pseudo direct mount * (autofs-4.1). * (ii) indirect mount with offset mount, check the "/" * offset (autofs-5.0+). */ if (d_mountpoint(dentry)) { DPRINTK("checking mountpoint %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 2; if (dentry->d_count > ino_count) goto next; /* Can we umount this guy */ if (autofs4_mount_busy(mnt, dentry)) goto next; /* Can we expire this guy */ if (autofs4_can_expire(dentry, timeout, do_now)) { expired = dentry; goto found; } goto next; } if (simple_empty(dentry)) goto next; /* Case 2: tree mount, expire iff entire tree is not busy */ if (!exp_leaves) { /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 1; if (dentry->d_count > ino_count) goto next; if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { expired = dentry; goto found; } /* * Case 3: pseudo direct mount, expire individual leaves * (autofs-4.1). */ } else { /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 1; if (dentry->d_count > ino_count) goto next; expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); if (expired) { dput(dentry); goto found; } } next: spin_unlock(&sbi->fs_lock); } return NULL; found: DPRINTK("returning %p %.*s", expired, (int)expired->d_name.len, expired->d_name.name); ino = autofs4_dentry_ino(expired); ino->flags |= AUTOFS_INF_EXPIRING; init_completion(&ino->expire_complete); spin_unlock(&sbi->fs_lock); spin_lock(&sbi->lookup_lock); spin_lock(&expired->d_parent->d_lock); spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED); list_move(&expired->d_parent->d_subdirs, &expired->d_child); spin_unlock(&expired->d_lock); spin_unlock(&expired->d_parent->d_lock); spin_unlock(&sbi->lookup_lock); return expired; }
/* Check a directory tree of mount points for busyness * The tree is not busy iff no mountpoints are busy */ static int autofs4_tree_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { struct autofs_info *top_ino = autofs4_dentry_ino(top); struct dentry *p; DPRINTK("top %p %.*s", top, (int)top->d_name.len, top->d_name.name); /* Negative dentry - give up */ if (!simple_positive(top)) return 1; p = NULL; while ((p = get_next_positive_dentry(p, top))) { DPRINTK("dentry %p %.*s", p, (int) p->d_name.len, p->d_name.name); /* * Is someone visiting anywhere in the subtree ? * If there's no mount we need to check the usage * count for the autofs dentry. * If the fs is busy update the expiry counter. */ if (d_mountpoint(p)) { if (autofs4_mount_busy(mnt, p)) { top_ino->last_used = jiffies; dput(p); return 1; } } else { struct autofs_info *ino = autofs4_dentry_ino(p); unsigned int ino_count = atomic_read(&ino->count); /* * Clean stale dentries below that have not been * invalidated after a mount fail during lookup */ d_invalidate(p); /* allow for dget above and top is already dgot */ if (p == top) ino_count += 2; else ino_count++; if (p->d_count > ino_count) { top_ino->last_used = jiffies; dput(p); return 1; } } } /* Timeout of a tree mount is ultimately determined by its top dentry */ if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }
/* * Find an eligible tree to time-out * A tree is eligible if :- * - it is unused by any user process * - it has been unused for exp_timeout time */ struct dentry *autofs4_expire_indirect(struct super_block *sb, struct vfsmount *mnt, struct autofs_sb_info *sbi, int how) { unsigned long timeout; struct dentry *root = sb->s_root; struct dentry *expired = NULL; struct list_head *next; int do_now = how & AUTOFS_EXP_IMMEDIATE; int exp_leaves = how & AUTOFS_EXP_LEAVES; struct autofs_info *ino; unsigned int ino_count; if (!root) return NULL; now = jiffies; timeout = sbi->exp_timeout; spin_lock(&dcache_lock); next = root->d_subdirs.next; /* 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_u.d_child); /* Negative dentry - give up */ if (!simple_positive(dentry)) { next = next->next; continue; } dentry = dget(dentry); spin_unlock(&dcache_lock); spin_lock(&sbi->fs_lock); ino = autofs4_dentry_ino(dentry); /* * Case 1: (i) indirect mount or top level pseudo direct mount * (autofs-4.1). * (ii) indirect mount with offset mount, check the "/" * offset (autofs-5.0+). */ if (d_mountpoint(dentry)) { DPRINTK("checking mountpoint %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 2; if (atomic_read(&dentry->d_count) > ino_count) goto next; /* Can we umount this guy */ if (autofs4_mount_busy(mnt, dentry)) goto next; /* Can we expire this guy */ if (autofs4_can_expire(dentry, timeout, do_now)) { expired = dentry; goto found; } goto next; } if (simple_empty(dentry)) goto next; /* Case 2: tree mount, expire iff entire tree is not busy */ if (!exp_leaves) { /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 1; if (atomic_read(&dentry->d_count) > ino_count) goto next; if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) { expired = dentry; goto found; } /* * Case 3: pseudo direct mount, expire individual leaves * (autofs-4.1). */ } else { /* Path walk currently on this dentry? */ ino_count = atomic_read(&ino->count) + 1; if (atomic_read(&dentry->d_count) > ino_count) goto next; expired = autofs4_check_leaves(mnt, dentry, timeout, do_now); if (expired) { dput(dentry); goto found; } } next: spin_unlock(&sbi->fs_lock); dput(dentry); spin_lock(&dcache_lock); next = next->next; } spin_unlock(&dcache_lock); return NULL; found: DPRINTK("returning %p %.*s", expired, (int)expired->d_name.len, expired->d_name.name); ino = autofs4_dentry_ino(expired); ino->flags |= AUTOFS_INF_EXPIRING; init_completion(&ino->expire_complete); spin_unlock(&sbi->fs_lock); spin_lock(&dcache_lock); list_move(&expired->d_parent->d_subdirs, &expired->d_u.d_child); spin_unlock(&dcache_lock); return expired; }
/* Check a directory tree of mount points for busyness * The tree is not busy iff no mountpoints are busy */ static int autofs4_tree_busy(struct vfsmount *mnt, struct dentry *top, unsigned long timeout, int do_now) { struct autofs_info *top_ino = autofs4_dentry_ino(top); struct dentry *p; DPRINTK("top %p %.*s", top, (int)top->d_name.len, top->d_name.name); /* Negative dentry - give up */ if (!simple_positive(top)) return 1; spin_lock(&dcache_lock); for (p = top; p; p = next_dentry(p, top)) { /* Negative dentry - give up */ if (!simple_positive(p)) continue; DPRINTK("dentry %p %.*s", p, (int) p->d_name.len, p->d_name.name); p = dget(p); spin_unlock(&dcache_lock); /* * Is someone visiting anywhere in the subtree ? * If there's no mount we need to check the usage * count for the autofs dentry. * If the fs is busy update the expiry counter. */ if (d_mountpoint(p)) { if (autofs4_mount_busy(mnt, p)) { top_ino->last_used = jiffies; dput(p); return 1; } } else { struct autofs_info *ino = autofs4_dentry_ino(p); unsigned int ino_count = atomic_read(&ino->count); /* allow for dget above and top is already dgot */ if (p == top) ino_count += 2; else ino_count++; if (atomic_read(&p->d_count) > ino_count) { top_ino->last_used = jiffies; dput(p); return 1; } } dput(p); spin_lock(&dcache_lock); } spin_unlock(&dcache_lock); /* Timeout of a tree mount is ultimately determined by its top dentry */ if (!autofs4_can_expire(top, timeout, do_now)) return 1; return 0; }