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authorAmir Goldstein <amir73il@gmail.com>2022-04-22 15:03:13 +0300
committerJan Kara <jack@suse.cz>2022-04-25 14:37:06 +0200
commit38035c04f5865c4ef9597d6beed6a7178f90f64a (patch)
treef77e39bb7ffad2ecd03eb2bb1461d21e9f16c5b5 /fs/notify
parenta32e697cda27679a0327ae2cafdad8c7170f548f (diff)
inotify: move control flags from mask to mark flags
The inotify control flags in the mark mask (e.g. FS_IN_ONE_SHOT) are not relevant to object interest mask, so move them to the mark flags. This frees up some bits in the object interest mask. Link: https://lore.kernel.org/r/20220422120327.3459282-3-amir73il@gmail.com Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fsnotify.c4
-rw-r--r--fs/notify/inotify/inotify.h11
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c2
-rw-r--r--fs/notify/inotify/inotify_user.c38
4 files changed, 36 insertions, 19 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 70a8516b78bc..6eee19d15e8c 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -253,7 +253,7 @@ static int fsnotify_handle_inode_event(struct fsnotify_group *group,
if (WARN_ON_ONCE(!inode && !dir))
return 0;
- if ((inode_mark->mask & FS_EXCL_UNLINK) &&
+ if ((inode_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK) &&
path && d_unlinked(path->dentry))
return 0;
@@ -581,7 +581,7 @@ static __init int fsnotify_init(void)
{
int ret;
- BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
+ BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index 8f00151eb731..7d5df7a21539 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -27,11 +27,18 @@ static inline struct inotify_event_info *INOTIFY_E(struct fsnotify_event *fse)
* userspace. There is at least one bit (FS_EVENT_ON_CHILD) which is
* used only internally to the kernel.
*/
-#define INOTIFY_USER_MASK (IN_ALL_EVENTS | IN_ONESHOT | IN_EXCL_UNLINK)
+#define INOTIFY_USER_MASK (IN_ALL_EVENTS)
static inline __u32 inotify_mark_user_mask(struct fsnotify_mark *fsn_mark)
{
- return fsn_mark->mask & INOTIFY_USER_MASK;
+ __u32 mask = fsn_mark->mask & INOTIFY_USER_MASK;
+
+ if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_EXCL_UNLINK)
+ mask |= IN_EXCL_UNLINK;
+ if (fsn_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
+ mask |= IN_ONESHOT;
+
+ return mask;
}
extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index d92d7b0adc9a..49cfe2ae6d23 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -122,7 +122,7 @@ int inotify_handle_inode_event(struct fsnotify_mark *inode_mark, u32 mask,
fsnotify_destroy_event(group, fsn_event);
}
- if (inode_mark->mask & IN_ONESHOT)
+ if (inode_mark->flags & FSNOTIFY_MARK_FLAG_IN_ONESHOT)
fsnotify_destroy_mark(inode_mark, group);
return 0;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 3ef57db0ec9d..d8907d32a05b 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -115,6 +115,21 @@ static inline __u32 inotify_arg_to_mask(struct inode *inode, u32 arg)
return mask;
}
+#define INOTIFY_MARK_FLAGS \
+ (FSNOTIFY_MARK_FLAG_EXCL_UNLINK | FSNOTIFY_MARK_FLAG_IN_ONESHOT)
+
+static inline unsigned int inotify_arg_to_flags(u32 arg)
+{
+ unsigned int flags = 0;
+
+ if (arg & IN_EXCL_UNLINK)
+ flags |= FSNOTIFY_MARK_FLAG_EXCL_UNLINK;
+ if (arg & IN_ONESHOT)
+ flags |= FSNOTIFY_MARK_FLAG_IN_ONESHOT;
+
+ return flags;
+}
+
static inline u32 inotify_mask_to_arg(__u32 mask)
{
return mask & (IN_ALL_EVENTS | IN_ISDIR | IN_UNMOUNT | IN_IGNORED |
@@ -526,13 +541,10 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
struct fsnotify_mark *fsn_mark;
struct inotify_inode_mark *i_mark;
__u32 old_mask, new_mask;
- __u32 mask;
- int add = (arg & IN_MASK_ADD);
+ int replace = !(arg & IN_MASK_ADD);
int create = (arg & IN_MASK_CREATE);
int ret;
- mask = inotify_arg_to_mask(inode, arg);
-
fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
if (!fsn_mark)
return -ENOENT;
@@ -545,10 +557,12 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
spin_lock(&fsn_mark->lock);
old_mask = fsn_mark->mask;
- if (add)
- fsn_mark->mask |= mask;
- else
- fsn_mark->mask = mask;
+ if (replace) {
+ fsn_mark->mask = 0;
+ fsn_mark->flags &= ~INOTIFY_MARK_FLAGS;
+ }
+ fsn_mark->mask |= inotify_arg_to_mask(inode, arg);
+ fsn_mark->flags |= inotify_arg_to_flags(arg);
new_mask = fsn_mark->mask;
spin_unlock(&fsn_mark->lock);
@@ -579,19 +593,17 @@ static int inotify_new_watch(struct fsnotify_group *group,
u32 arg)
{
struct inotify_inode_mark *tmp_i_mark;
- __u32 mask;
int ret;
struct idr *idr = &group->inotify_data.idr;
spinlock_t *idr_lock = &group->inotify_data.idr_lock;
- mask = inotify_arg_to_mask(inode, arg);
-
tmp_i_mark = kmem_cache_alloc(inotify_inode_mark_cachep, GFP_KERNEL);
if (unlikely(!tmp_i_mark))
return -ENOMEM;
fsnotify_init_mark(&tmp_i_mark->fsn_mark, group);
- tmp_i_mark->fsn_mark.mask = mask;
+ tmp_i_mark->fsn_mark.mask = inotify_arg_to_mask(inode, arg);
+ tmp_i_mark->fsn_mark.flags = inotify_arg_to_flags(arg);
tmp_i_mark->wd = -1;
ret = inotify_add_to_idr(idr, idr_lock, tmp_i_mark);
@@ -845,9 +857,7 @@ static int __init inotify_user_setup(void)
BUILD_BUG_ON(IN_UNMOUNT != FS_UNMOUNT);
BUILD_BUG_ON(IN_Q_OVERFLOW != FS_Q_OVERFLOW);
BUILD_BUG_ON(IN_IGNORED != FS_IN_IGNORED);
- BUILD_BUG_ON(IN_EXCL_UNLINK != FS_EXCL_UNLINK);
BUILD_BUG_ON(IN_ISDIR != FS_ISDIR);
- BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
BUILD_BUG_ON(HWEIGHT32(ALL_INOTIFY_BITS) != 22);