Re: [PATCH v6 1/7] fs: pass the request_mask to generic_fillattr

Joseph Qi
2023-07-26T09:41:11Z

On 7/25/23 10:58 PM, Jeff Layton wrote:
> generic_fillattr just fills in the entire stat struct indiscriminately
> today, copying data from the inode. There is at least one attribute
> (STATX_CHANGE_COOKIE) that can have side effects when it is reported,
> and we're looking at adding more with the addition of multigrain
> timestamps.
>
> Add a request_mask argument to generic_fillattr and have most callers
> just pass in the value that is passed to getattr. Have other callers
> (e.g. ksmbd) just pass in STATX_BASIC_STATS. Also move the setting of
> STATX_CHANGE_COOKIE into generic_fillattr.
>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
> ---
> fs/9p/vfs_inode.c | 4 ++--
> fs/9p/vfs_inode_dotl.c | 4 ++--
> fs/afs/inode.c | 2 +-
> fs/btrfs/inode.c | 2 +-
> fs/ceph/inode.c | 2 +-
> fs/coda/inode.c | 3 ++-
> fs/ecryptfs/inode.c | 5 +++--
> fs/erofs/inode.c | 2 +-
> fs/exfat/file.c | 2 +-
> fs/ext2/inode.c | 2 +-
> fs/ext4/inode.c | 2 +-
> fs/f2fs/file.c | 2 +-
> fs/fat/file.c | 2 +-
> fs/fuse/dir.c | 2 +-
> fs/gfs2/inode.c | 2 +-
> fs/hfsplus/inode.c | 2 +-
> fs/kernfs/inode.c | 2 +-
> fs/libfs.c | 4 ++--
> fs/minix/inode.c | 2 +-
> fs/nfs/inode.c | 2 +-
> fs/nfs/namespace.c | 3 ++-
> fs/ntfs3/file.c | 2 +-
> fs/ocfs2/file.c | 2 +-
> fs/orangefs/inode.c | 2 +-
> fs/proc/base.c | 4 ++--
> fs/proc/fd.c | 2 +-
> fs/proc/generic.c | 2 +-
> fs/proc/proc_net.c | 2 +-
> fs/proc/proc_sysctl.c | 2 +-
> fs/proc/root.c | 3 ++-
> fs/smb/client/inode.c | 2 +-
> fs/smb/server/smb2pdu.c | 22 +++++++++++-----------
> fs/smb/server/vfs.c | 3 ++-
> fs/stat.c | 18 ++++++++++--------
> fs/sysv/itree.c | 3 ++-
> fs/ubifs/dir.c | 2 +-
> fs/udf/symlink.c | 2 +-
> fs/vboxsf/utils.c | 2 +-
> include/linux/fs.h | 2 +-
> mm/shmem.c | 2 +-
> 40 files changed, 70 insertions(+), 62 deletions(-)
>

...

> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index 1b337ebce4df..8184499ae7a5 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -1319,7 +1319,7 @@ int ocfs2_getattr(struct mnt_idmap *idmap, const struct path *path,
> goto bail;
> }
>
> - generic_fillattr(&nop_mnt_idmap, inode, stat);
> + generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);

For ocfs2 part, looks fine to me.

Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>

> /*
> * If there is inline data in the inode, the inode will normally not
> * have data blocks allocated (it may have an external xattr block).

...

> diff --git a/fs/stat.c b/fs/stat.c
> index 8c2b30af19f5..062f311b5386 100644
> --- a/fs/stat.c
> +++ b/fs/stat.c
> @@ -29,6 +29,7 @@
> /**
> * generic_fillattr - Fill in the basic attributes from the inode struct
> * @idmap: idmap of the mount the inode was found from
> + * @req_mask statx request_mask

s/req_mask/request_mask

> * @inode: Inode to use as the source
> * @stat: Where to fill in the attributes
> *
> @@ -42,8 +43,8 @@
> * uid and gid filds. On non-idmapped mounts or if permission checking is to be
> * performed on the raw inode simply passs @nop_mnt_idmap.
> */
> -void generic_fillattr(struct mnt_idmap *idmap, struct inode *inode,
> - struct kstat *stat)
> +void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
> + struct inode *inode, struct kstat *stat)
> {
> vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
> vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
> @@ -61,6 +62,12 @@ void generic_fillattr(struct mnt_idmap *idmap, struct inode *inode,
> stat->ctime = inode_get_ctime(inode);
> stat->blksize = i_blocksize(inode);
> stat->blocks = inode->i_blocks;
> +
> + if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
> + stat->result_mask |= STATX_CHANGE_COOKIE;
> + stat->change_cookie = inode_query_iversion(inode);
> + }
> +
> }
> EXPORT_SYMBOL(generic_fillattr);
>
> @@ -123,17 +130,12 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
> stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
> STATX_ATTR_DAX);
>
> - if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
> - stat->result_mask |= STATX_CHANGE_COOKIE;
> - stat->change_cookie = inode_query_iversion(inode);
> - }
> -
> idmap = mnt_idmap(path->mnt);
> if (inode->i_op->getattr)
> return inode->i_op->getattr(idmap, path, stat,
> request_mask, query_flags);
>
> - generic_fillattr(idmap, inode, stat);
> + generic_fillattr(idmap, request_mask, inode, stat);
> return 0;
> }
> EXPORT_SYMBOL(vfs_getattr_nosec);

...