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fsnotify: vfsmount marks generic functions
Much like inode-mark.c has all of the code dealing with marks on inodes this patch adds a vfsmount-mark.c which has similar code but is intended for marks on vfsmounts. Signed-off-by: Eric Paris <eparis@redhat.com>
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Eric Paris
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Jul 28, 2010
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| /* | ||
| * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; either version 2, or (at your option) | ||
| * any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; see the file COPYING. If not, write to | ||
| * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| */ | ||
|
|
||
| #include <linux/fs.h> | ||
| #include <linux/init.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/module.h> | ||
| #include <linux/mount.h> | ||
| #include <linux/mutex.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/spinlock.h> | ||
| #include <linux/writeback.h> /* for inode_lock */ | ||
|
|
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| #include <asm/atomic.h> | ||
|
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| #include <linux/fsnotify_backend.h> | ||
| #include "fsnotify.h" | ||
|
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| void fsnotify_clear_marks_by_mount(struct vfsmount *mnt) | ||
| { | ||
| struct fsnotify_mark *mark, *lmark; | ||
| struct hlist_node *pos, *n; | ||
| LIST_HEAD(free_list); | ||
|
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| spin_lock(&mnt->mnt_root->d_lock); | ||
| hlist_for_each_entry_safe(mark, pos, n, &mnt->mnt_fsnotify_marks, m.m_list) { | ||
| list_add(&mark->m.free_m_list, &free_list); | ||
| hlist_del_init(&mark->m.m_list); | ||
| fsnotify_get_mark(mark); | ||
| } | ||
| spin_unlock(&mnt->mnt_root->d_lock); | ||
|
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| list_for_each_entry_safe(mark, lmark, &free_list, m.free_m_list) { | ||
| fsnotify_destroy_mark(mark); | ||
| fsnotify_put_mark(mark); | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| * Recalculate the mask of events relevant to a given vfsmount locked. | ||
| */ | ||
| static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt) | ||
| { | ||
| struct fsnotify_mark *mark; | ||
| struct hlist_node *pos; | ||
| __u32 new_mask = 0; | ||
|
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| assert_spin_locked(&mnt->mnt_root->d_lock); | ||
|
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| hlist_for_each_entry(mark, pos, &mnt->mnt_fsnotify_marks, m.m_list) | ||
| new_mask |= mark->mask; | ||
| mnt->mnt_fsnotify_mask = new_mask; | ||
| } | ||
|
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| /* | ||
| * Recalculate the mnt->mnt_fsnotify_mask, or the mask of all FS_* event types | ||
| * any notifier is interested in hearing for this mount point | ||
| */ | ||
| void fsnotify_recalc_vfsmount_mask(struct vfsmount *mnt) | ||
| { | ||
| spin_lock(&mnt->mnt_root->d_lock); | ||
| fsnotify_recalc_vfsmount_mask_locked(mnt); | ||
| spin_unlock(&mnt->mnt_root->d_lock); | ||
| } | ||
|
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| void fsnotify_destroy_vfsmount_mark(struct fsnotify_mark *mark) | ||
| { | ||
| struct vfsmount *mnt = mark->m.mnt; | ||
|
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| assert_spin_locked(&mark->lock); | ||
| assert_spin_locked(&mark->group->mark_lock); | ||
|
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| spin_lock(&mnt->mnt_root->d_lock); | ||
|
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| hlist_del_init(&mark->m.m_list); | ||
| mark->m.mnt = NULL; | ||
|
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| fsnotify_recalc_vfsmount_mask_locked(mnt); | ||
|
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| spin_unlock(&mnt->mnt_root->d_lock); | ||
| } | ||
|
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| static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_group *group, | ||
| struct vfsmount *mnt) | ||
| { | ||
| struct fsnotify_mark *mark; | ||
| struct hlist_node *pos; | ||
|
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| assert_spin_locked(&mnt->mnt_root->d_lock); | ||
|
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| hlist_for_each_entry(mark, pos, &mnt->mnt_fsnotify_marks, m.m_list) { | ||
| if (mark->group == group) { | ||
| fsnotify_get_mark(mark); | ||
| return mark; | ||
| } | ||
| } | ||
| return NULL; | ||
| } | ||
|
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| /* | ||
| * given a group and vfsmount, find the mark associated with that combination. | ||
| * if found take a reference to that mark and return it, else return NULL | ||
| */ | ||
| struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, | ||
| struct vfsmount *mnt) | ||
| { | ||
| struct fsnotify_mark *mark; | ||
|
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| spin_lock(&mnt->mnt_root->d_lock); | ||
| mark = fsnotify_find_vfsmount_mark_locked(group, mnt); | ||
| spin_unlock(&mnt->mnt_root->d_lock); | ||
|
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| return mark; | ||
| } | ||
|
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| /* | ||
| * Attach an initialized mark to a given group and vfsmount. | ||
| * These marks may be used for the fsnotify backend to determine which | ||
| * event types should be delivered to which groups. | ||
| */ | ||
| int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark, | ||
| struct fsnotify_group *group, struct vfsmount *mnt, | ||
| int allow_dups) | ||
| { | ||
| struct fsnotify_mark *lmark = NULL; | ||
| int ret = 0; | ||
|
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| mark->flags = FSNOTIFY_MARK_FLAG_VFSMOUNT; | ||
|
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| /* | ||
| * LOCKING ORDER!!!! | ||
| * mark->lock | ||
| * group->mark_lock | ||
| * mnt->mnt_root->d_lock | ||
| */ | ||
| assert_spin_locked(&mark->lock); | ||
| assert_spin_locked(&group->mark_lock); | ||
|
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| spin_lock(&mnt->mnt_root->d_lock); | ||
|
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| if (!allow_dups) | ||
| lmark = fsnotify_find_vfsmount_mark_locked(group, mnt); | ||
| if (!lmark) { | ||
| mark->m.mnt = mnt; | ||
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| hlist_add_head(&mark->m.m_list, &mnt->mnt_fsnotify_marks); | ||
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| fsnotify_recalc_vfsmount_mask_locked(mnt); | ||
| } else { | ||
| ret = -EEXIST; | ||
| } | ||
|
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| spin_unlock(&mnt->mnt_root->d_lock); | ||
|
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| return ret; | ||
| } |
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