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Diffstat (limited to 'fs/notify/fsnotify.c')
-rw-r--r--fs/notify/fsnotify.c68
1 files changed, 36 insertions, 32 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 3970392b2722..36802420d69a 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -148,13 +148,14 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
const unsigned char *file_name,
struct fsnotify_event **event)
{
- struct fsnotify_group *group = inode_mark->group;
- __u32 inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
- __u32 vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
+ struct fsnotify_group *group = NULL;
+ __u32 inode_test_mask = 0;
+ __u32 vfsmount_test_mask = 0;
- pr_debug("%s: group=%p to_tell=%p mnt=%p mark=%p mask=%x data=%p"
- " data_is=%d cookie=%d event=%p\n", __func__, group, to_tell,
- mnt, inode_mark, mask, data, data_is, cookie, *event);
+ if (unlikely(!inode_mark && !vfsmount_mark)) {
+ BUG();
+ return 0;
+ }
/* clear ignored on inode modification */
if (mask & FS_MODIFY) {
@@ -168,18 +169,29 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
/* does the inode mark tell us to do something? */
if (inode_mark) {
+ group = inode_mark->group;
+ inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
inode_test_mask &= inode_mark->mask;
inode_test_mask &= ~inode_mark->ignored_mask;
}
/* does the vfsmount_mark tell us to do something? */
if (vfsmount_mark) {
+ vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
+ group = vfsmount_mark->group;
vfsmount_test_mask &= vfsmount_mark->mask;
vfsmount_test_mask &= ~vfsmount_mark->ignored_mask;
if (inode_mark)
vfsmount_test_mask &= ~inode_mark->ignored_mask;
}
+ pr_debug("%s: group=%p to_tell=%p mnt=%p mask=%x inode_mark=%p"
+ " inode_test_mask=%x vfsmount_mark=%p vfsmount_test_mask=%x"
+ " data=%p data_is=%d cookie=%d event=%p\n",
+ __func__, group, to_tell, mnt, mask, inode_mark,
+ inode_test_mask, vfsmount_mark, vfsmount_test_mask, data,
+ data_is, cookie, *event);
+
if (!inode_test_mask && !vfsmount_test_mask)
return 0;
@@ -207,13 +219,12 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
const unsigned char *file_name, u32 cookie)
{
- struct hlist_node *inode_node, *vfsmount_node;
+ struct hlist_node *inode_node = NULL, *vfsmount_node = NULL;
struct fsnotify_mark *inode_mark = NULL, *vfsmount_mark = NULL;
struct fsnotify_group *inode_group, *vfsmount_group;
struct fsnotify_event *event = NULL;
struct vfsmount *mnt;
int idx, ret = 0;
- bool used_inode = false, used_vfsmount = false;
/* global tests shouldn't care about events on child only the specific event */
__u32 test_mask = (mask & ~FS_EVENT_ON_CHILD);
@@ -238,57 +249,50 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
(test_mask & to_tell->i_fsnotify_mask))
inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
&fsnotify_mark_srcu);
- else
- inode_node = NULL;
- if (mnt) {
- if ((mask & FS_MODIFY) ||
- (test_mask & mnt->mnt_fsnotify_mask))
- vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
- &fsnotify_mark_srcu);
- else
- vfsmount_node = NULL;
- } else {
- mnt = NULL;
- vfsmount_node = NULL;
+ if (mnt && ((mask & FS_MODIFY) ||
+ (test_mask & mnt->mnt_fsnotify_mask))) {
+ vfsmount_node = srcu_dereference(mnt->mnt_fsnotify_marks.first,
+ &fsnotify_mark_srcu);
+ inode_node = srcu_dereference(to_tell->i_fsnotify_marks.first,
+ &fsnotify_mark_srcu);
}
while (inode_node || vfsmount_node) {
+ inode_group = vfsmount_group = NULL;
+
if (inode_node) {
inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu),
struct fsnotify_mark, i.i_list);
inode_group = inode_mark->group;
- } else
- inode_group = (void *)-1;
+ }
if (vfsmount_node) {
vfsmount_mark = hlist_entry(srcu_dereference(vfsmount_node, &fsnotify_mark_srcu),
struct fsnotify_mark, m.m_list);
vfsmount_group = vfsmount_mark->group;
- } else
- vfsmount_group = (void *)-1;
+ }
- if (inode_group < vfsmount_group) {
+ if (inode_group > vfsmount_group) {
/* handle inode */
send_to_group(to_tell, NULL, inode_mark, NULL, mask, data,
data_is, cookie, file_name, &event);
- used_inode = true;
- } else if (vfsmount_group < inode_group) {
+ /* we didn't use the vfsmount_mark */
+ vfsmount_group = NULL;
+ } else if (vfsmount_group > inode_group) {
send_to_group(to_tell, mnt, NULL, vfsmount_mark, mask, data,
data_is, cookie, file_name, &event);
- used_vfsmount = true;
+ inode_group = NULL;
} else {
send_to_group(to_tell, mnt, inode_mark, vfsmount_mark,
mask, data, data_is, cookie, file_name,
&event);
- used_vfsmount = true;
- used_inode = true;
}
- if (used_inode)
+ if (inode_group)
inode_node = srcu_dereference(inode_node->next,
&fsnotify_mark_srcu);
- if (used_vfsmount)
+ if (vfsmount_group)
vfsmount_node = srcu_dereference(vfsmount_node->next,
&fsnotify_mark_srcu);
}