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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-25 16:58:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-25 16:58:51 -0700
commita8988507e577a89ccaf66b48ea645bcf6e861270 (patch)
treed05531ad7078d9dda1733c0741aa8b9f9148f6aa /fs
parentcb7cbaae7fd9cee64f19cdfd89d097d807b884f5 (diff)
parentf92ca72b0263d601807bbd23ed25cbe6f4da89f4 (diff)
downloadlwn-a8988507e577a89ccaf66b48ea645bcf6e861270.tar.gz
lwn-a8988507e577a89ccaf66b48ea645bcf6e861270.zip
Merge tag 'fsnotify_for_v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull fsnotify updates from Jan Kara: "A few fsnotify improvements and cleanups" * tag 'fsnotify_for_v5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: fsnotify: remove redundant parameter judgment fsnotify: optimize FS_MODIFY events with no ignored masks fsnotify: fix merge with parent's ignored mask
Diffstat (limited to 'fs')
-rw-r--r--fs/notify/fanotify/fanotify_user.c47
-rw-r--r--fs/notify/fsnotify.c14
-rw-r--r--fs/notify/mark.c4
3 files changed, 42 insertions, 23 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 2ff6bd85ba8f..9b32b76a9c30 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -1003,17 +1003,18 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
__u32 mask, unsigned int flags,
__u32 umask, int *destroy)
{
- __u32 oldmask = 0;
+ __u32 oldmask, newmask;
/* umask bits cannot be removed by user */
mask &= ~umask;
spin_lock(&fsn_mark->lock);
+ oldmask = fsnotify_calc_mask(fsn_mark);
if (!(flags & FAN_MARK_IGNORED_MASK)) {
- oldmask = fsn_mark->mask;
fsn_mark->mask &= ~mask;
} else {
fsn_mark->ignored_mask &= ~mask;
}
+ newmask = fsnotify_calc_mask(fsn_mark);
/*
* We need to keep the mark around even if remaining mask cannot
* result in any events (e.g. mask == FAN_ONDIR) to support incremenal
@@ -1023,7 +1024,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
*destroy = !((fsn_mark->mask | fsn_mark->ignored_mask) & ~umask);
spin_unlock(&fsn_mark->lock);
- return mask & oldmask;
+ return oldmask & ~newmask;
}
static int fanotify_remove_mark(struct fsnotify_group *group,
@@ -1080,24 +1081,42 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
flags, umask);
}
+static void fanotify_mark_add_ignored_mask(struct fsnotify_mark *fsn_mark,
+ __u32 mask, unsigned int flags,
+ __u32 *removed)
+{
+ fsn_mark->ignored_mask |= mask;
+
+ /*
+ * Setting FAN_MARK_IGNORED_SURV_MODIFY for the first time may lead to
+ * the removal of the FS_MODIFY bit in calculated mask if it was set
+ * because of an ignored mask that is now going to survive FS_MODIFY.
+ */
+ if ((flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
+ !(fsn_mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) {
+ fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
+ if (!(fsn_mark->mask & FS_MODIFY))
+ *removed = FS_MODIFY;
+ }
+}
+
static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
- __u32 mask,
- unsigned int flags)
+ __u32 mask, unsigned int flags,
+ __u32 *removed)
{
- __u32 oldmask = -1;
+ __u32 oldmask, newmask;
spin_lock(&fsn_mark->lock);
+ oldmask = fsnotify_calc_mask(fsn_mark);
if (!(flags & FAN_MARK_IGNORED_MASK)) {
- oldmask = fsn_mark->mask;
fsn_mark->mask |= mask;
} else {
- fsn_mark->ignored_mask |= mask;
- if (flags & FAN_MARK_IGNORED_SURV_MODIFY)
- fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
+ fanotify_mark_add_ignored_mask(fsn_mark, mask, flags, removed);
}
+ newmask = fsnotify_calc_mask(fsn_mark);
spin_unlock(&fsn_mark->lock);
- return mask & ~oldmask;
+ return newmask & ~oldmask;
}
static struct fsnotify_mark *fanotify_add_new_mark(struct fsnotify_group *group,
@@ -1155,7 +1174,7 @@ static int fanotify_add_mark(struct fsnotify_group *group,
__kernel_fsid_t *fsid)
{
struct fsnotify_mark *fsn_mark;
- __u32 added;
+ __u32 added, removed = 0;
int ret = 0;
mutex_lock(&group->mark_mutex);
@@ -1178,8 +1197,8 @@ static int fanotify_add_mark(struct fsnotify_group *group,
goto out;
}
- added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
- if (added & ~fsnotify_conn_mask(fsn_mark->connector))
+ added = fanotify_mark_add_to_mask(fsn_mark, mask, flags, &removed);
+ if (removed || (added & ~fsnotify_conn_mask(fsn_mark->connector)))
fsnotify_recalc_mask(fsn_mark->connector);
out:
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index ab81a0776ece..70a8516b78bc 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -70,8 +70,7 @@ static void fsnotify_unmount_inodes(struct super_block *sb)
spin_unlock(&inode->i_lock);
spin_unlock(&sb->s_inode_list_lock);
- if (iput_inode)
- iput(iput_inode);
+ iput(iput_inode);
/* for each watch, send FS_UNMOUNT and then remove it */
fsnotify_inode(inode, FS_UNMOUNT);
@@ -85,8 +84,7 @@ static void fsnotify_unmount_inodes(struct super_block *sb)
}
spin_unlock(&sb->s_inode_list_lock);
- if (iput_inode)
- iput(iput_inode);
+ iput(iput_inode);
}
void fsnotify_sb_delete(struct super_block *sb)
@@ -531,11 +529,13 @@ int fsnotify(__u32 mask, const void *data, int data_type, struct inode *dir,
/*
- * if this is a modify event we may need to clear the ignored masks
- * otherwise return if none of the marks care about this type of event.
+ * If this is a modify event we may need to clear some ignored masks.
+ * In that case, the object with ignored masks will have the FS_MODIFY
+ * event in its mask.
+ * Otherwise, return if none of the marks care about this type of event.
*/
test_mask = (mask & ALL_FSNOTIFY_EVENTS);
- if (!(mask & FS_MODIFY) && !(test_mask & marks_mask))
+ if (!(test_mask & marks_mask))
return 0;
iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu);
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 9007d6affff3..4853184f7dde 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -127,7 +127,7 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
return;
hlist_for_each_entry(mark, &conn->list, obj_list) {
if (mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED)
- new_mask |= mark->mask;
+ new_mask |= fsnotify_calc_mask(mark);
}
*fsnotify_conn_mask_p(conn) = new_mask;
}
@@ -692,7 +692,7 @@ int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
if (ret)
goto err;
- if (mark->mask)
+ if (mark->mask || mark->ignored_mask)
fsnotify_recalc_mask(mark->connector);
return ret;