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fanotify: use vfs_get_fsid() helper instead of vfs_statfs() 

This is a cleanup that doesn't change any logic.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2019-01-10 19:04:39 +02:00 committed by Jan Kara
parent ec86ff5689
commit 73072283a2
1 changed files with 10 additions and 15 deletions
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25
fs/notify/fanotify/fanotify_user.c
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@ -863,35 +863,31 @@ out_destroy_group:
}
/* Check if filesystem can encode a unique fid */
static int fanotify_test_fid(struct path *path, struct kstatfs *stat)
static int fanotify_test_fid(struct path *path, __kernel_fsid_t *fsid)
{
struct kstatfs root_stat;
struct path root = {
.mnt = path->mnt,
.dentry = path->dentry->d_sb->s_root,
};
__kernel_fsid_t root_fsid;
int err;
/*
* Make sure path is not in filesystem with zero fsid (e.g. tmpfs).
*/
err = vfs_statfs(path, stat);
err = vfs_get_fsid(path->dentry, fsid);
if (err)
return err;
if (!stat->f_fsid.val[0] && !stat->f_fsid.val[1])
if (!fsid->val[0] && !fsid->val[1])
return -ENODEV;
/*
* Make sure path is not inside a filesystem subvolume (e.g. btrfs)
* which uses a different fsid than sb root.
*/
err = vfs_statfs(&root, &root_stat);
err = vfs_get_fsid(path->dentry->d_sb->s_root, &root_fsid);
if (err)
return err;
if (root_stat.f_fsid.val[0] != stat->f_fsid.val[0] ||
root_stat.f_fsid.val[1] != stat->f_fsid.val[1])
if (root_fsid.val[0] != fsid->val[0] ||
root_fsid.val[1] != fsid->val[1])
return -EXDEV;
/*
@ -916,8 +912,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
struct fsnotify_group *group;
struct fd f;
struct path path;
struct kstatfs stat;
__kernel_fsid_t *fsid = NULL;
__kernel_fsid_t __fsid, *fsid = NULL;
u32 valid_mask = FANOTIFY_EVENTS | FANOTIFY_EVENT_FLAGS;
unsigned int mark_type = flags & FANOTIFY_MARK_TYPE_BITS;
int ret;
@ -996,11 +991,11 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
goto fput_and_out;
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
ret = fanotify_test_fid(&path, &stat);
ret = fanotify_test_fid(&path, &__fsid);
if (ret)
goto path_put_and_out;
fsid = &stat.f_fsid;
fsid = &__fsid;
}
/* inode held in place by reference to path; group by fget on fd */