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authorAmir Goldstein <amir73il@gmail.com>2018-09-01 10:41:13 +0300
committerJan Kara <jack@suse.cz>2018-09-03 15:16:11 +0200
commitd54f4fba889b205e9cd8239182ca5d27d0ac3bc2 (patch)
tree2b0e5b709d0663942520d6aa830a7cd517db804d /fs/notify/fanotify
parent60f7ed8c7c4d06aeda448c6da74621552ee739aa (diff)
downloadlinux-d54f4fba889b205e9cd8239182ca5d27d0ac3bc2.tar.bz2
fanotify: add API to attach/detach super block mark
Add another mark type flag FAN_MARK_FILESYSTEM for add/remove/flush of super block mark type. A super block watch gets all events on the filesystem, regardless of the mount from which the mark was added, unless an ignore mask exists on either the inode or the mount where the event was generated. Only one of FAN_MARK_MOUNT and FAN_MARK_FILESYSTEM mark type flags may be provided to fanotify_mark() or no mark type flag for inode mark. Cc: <linux-api@vger.kernel.org> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify')
-rw-r--r--fs/notify/fanotify/fanotify_user.c42
1 files changed, 37 insertions, 5 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 69054886915b..1347c588f778 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -563,6 +563,13 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
mask, flags);
}
+static int fanotify_remove_sb_mark(struct fsnotify_group *group,
+ struct super_block *sb, __u32 mask,
+ unsigned int flags)
+{
+ return fanotify_remove_mark(group, &sb->s_fsnotify_marks, mask, flags);
+}
+
static int fanotify_remove_inode_mark(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
unsigned int flags)
@@ -658,6 +665,14 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
FSNOTIFY_OBJ_TYPE_VFSMOUNT, mask, flags);
}
+static int fanotify_add_sb_mark(struct fsnotify_group *group,
+ struct super_block *sb, __u32 mask,
+ unsigned int flags)
+{
+ return fanotify_add_mark(group, &sb->s_fsnotify_marks,
+ FSNOTIFY_OBJ_TYPE_SB, mask, flags);
+}
+
static int fanotify_add_inode_mark(struct fsnotify_group *group,
struct inode *inode, __u32 mask,
unsigned int flags)
@@ -806,6 +821,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
struct fd f;
struct path path;
u32 valid_mask = FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD;
+ unsigned int mark_type = flags & FAN_MARK_TYPE_MASK;
int ret;
pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n",
@@ -817,6 +833,16 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
if (flags & ~FAN_ALL_MARK_FLAGS)
return -EINVAL;
+
+ switch (mark_type) {
+ case FAN_MARK_INODE:
+ case FAN_MARK_MOUNT:
+ case FAN_MARK_FILESYSTEM:
+ break;
+ default:
+ return -EINVAL;
+ }
+
switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
case FAN_MARK_ADD: /* fallthrough */
case FAN_MARK_REMOVE:
@@ -824,7 +850,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
return -EINVAL;
break;
case FAN_MARK_FLUSH:
- if (flags & ~(FAN_MARK_MOUNT | FAN_MARK_FLUSH))
+ if (flags & ~(FAN_MARK_TYPE_MASK | FAN_MARK_FLUSH))
return -EINVAL;
break;
default:
@@ -863,8 +889,10 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
if (flags & FAN_MARK_FLUSH) {
ret = 0;
- if (flags & FAN_MARK_MOUNT)
+ if (mark_type == FAN_MARK_MOUNT)
fsnotify_clear_vfsmount_marks_by_group(group);
+ else if (mark_type == FAN_MARK_FILESYSTEM)
+ fsnotify_clear_sb_marks_by_group(group);
else
fsnotify_clear_inode_marks_by_group(group);
goto fput_and_out;
@@ -875,7 +903,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
goto fput_and_out;
/* inode held in place by reference to path; group by fget on fd */
- if (!(flags & FAN_MARK_MOUNT))
+ if (mark_type == FAN_MARK_INODE)
inode = path.dentry->d_inode;
else
mnt = path.mnt;
@@ -883,14 +911,18 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
/* create/update an inode mark */
switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) {
case FAN_MARK_ADD:
- if (flags & FAN_MARK_MOUNT)
+ if (mark_type == FAN_MARK_MOUNT)
ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags);
+ else if (mark_type == FAN_MARK_FILESYSTEM)
+ ret = fanotify_add_sb_mark(group, mnt->mnt_sb, mask, flags);
else
ret = fanotify_add_inode_mark(group, inode, mask, flags);
break;
case FAN_MARK_REMOVE:
- if (flags & FAN_MARK_MOUNT)
+ if (mark_type == FAN_MARK_MOUNT)
ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags);
+ else if (mark_type == FAN_MARK_FILESYSTEM)
+ ret = fanotify_remove_sb_mark(group, mnt->mnt_sb, mask, flags);
else
ret = fanotify_remove_inode_mark(group, inode, mask, flags);
break;