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fanotify: implement fanotify listener ordering
The fanotify listeners needs to be able to specify what types of operations they are going to perform so they can be ordered appropriately between other listeners doing other types of operations. They need this to be able to make sure that things like hierarchichal storage managers will get access to inodes before processes which need the data. This patch defines 3 possible uses which groups must indicate in the fanotify_init() flags. FAN_CLASS_PRE_CONTENT FAN_CLASS_CONTENT FAN_CLASS_NOTIF Groups will receive notification in that order. The order between 2 groups in the same class is undeterministic. FAN_CLASS_PRE_CONTENT is intended to be used by listeners which need access to the inode before they are certain that the inode contains it's final data. A hierarchical storage manager should choose to use this class. FAN_CLASS_CONTENT is intended to be used by listeners which need access to the inode after it contains its intended contents. This would be the appropriate level for an AV solution or document control system. FAN_CLASS_NOTIF is intended for normal async notification about access, much the same as inotify and dnotify. Syncronous permissions events are not permitted at this class. Signed-off-by: Eric Paris <eparis@redhat.com>
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parent
6ad2d4e3e9
commit
4231a23530
2 changed files with 34 additions and 2 deletions
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@ -664,6 +664,20 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
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init_waitqueue_head(&group->fanotify_data.access_waitq);
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INIT_LIST_HEAD(&group->fanotify_data.access_list);
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#endif
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switch (flags & FAN_ALL_CLASS_BITS) {
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case FAN_CLASS_NOTIF:
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group->priority = FS_PRIO_0;
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break;
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case FAN_CLASS_CONTENT:
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group->priority = FS_PRIO_1;
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break;
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case FAN_CLASS_PRE_CONTENT:
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group->priority = FS_PRIO_2;
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break;
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default:
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fd = -EINVAL;
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goto out_put_group;
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}
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fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);
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if (fd < 0)
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@ -719,6 +733,16 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
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ret = -EINVAL;
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if (unlikely(filp->f_op != &fanotify_fops))
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goto fput_and_out;
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group = filp->private_data;
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/*
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* group->priority == FS_PRIO_0 == FAN_CLASS_NOTIF. These are not
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* allowed to set permissions events.
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*/
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ret = -EINVAL;
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if (mask & FAN_ALL_PERM_EVENTS &&
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group->priority == FS_PRIO_0)
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goto fput_and_out;
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ret = fanotify_find_path(dfd, pathname, &path, flags);
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if (ret)
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@ -729,7 +753,6 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
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inode = path.dentry->d_inode;
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else
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mnt = path.mnt;
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group = filp->private_data;
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/* create/update an inode mark */
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switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
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@ -25,7 +25,16 @@
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#define FAN_CLOEXEC 0x00000001
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#define FAN_NONBLOCK 0x00000002
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#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK)
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/* These are NOT bitwise flags. Both bits are used togther. */
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#define FAN_CLASS_NOTIF 0x00000000
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#define FAN_CLASS_CONTENT 0x00000004
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#define FAN_CLASS_PRE_CONTENT 0x00000008
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#define FAN_ALL_CLASS_BITS (FAN_CLASS_NOTIF | FAN_CLASS_CONTENT | \
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FAN_CLASS_PRE_CONTENT)
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#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK | \
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FAN_ALL_CLASS_BITS)
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/* flags used for fanotify_modify_mark() */
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#define FAN_MARK_ADD 0x00000001
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