[PATCH 3/6] xstat: AFS: Return extended attributes

Return extended attributes from the AFS filesystem. This includes the following: (1) The vnode uniquifier as st_gen. (2) The data version number as st_data_version. (3) XSTAT_INFO_AUTOMOUNT will be set on automount directories by virtue of S_AUTOMOUNT being set on the inode. These are referrals to other volumes or other cells. (4) XSTAT_INFO_AUTODIR on a directory that does cell lookup for non-existent names and mounts them (typically mounted on /afs with -o autocell). The resulting directories are marked XSTAT_INFO_FABRICATED as they do not actually exist in the mounted AFS directory. (6) Files, directories and symlinks accessed over AFS are marked XSTAT_INFO_REMOTE. (7) XSTAT_INFO_NONSYSTEM_OWNERSHIP is set as the UID and GID retrieved from an AFS share may not be applicable on the system. (8) XSTAT_INFO_HAS_ACL is set as AFS directories have ACLs (the UID and GID are only used through the ACLs) and these ACLs apply to the contents of the directories. Signed-off-by: David Howells <dhowells(a)redhat.com> --- fs/afs/inode.c | 29 +++++++++++++++++++++-------- fs/afs/super.c | 7 +++++++ 2 files changed, 28 insertions(+), 8 deletions(-) diff --git a/fs/afs/inode.c b/fs/afs/inode.c index d890ae3..062def2 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -71,9 +71,9 @@ static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) inode->i_uid = vnode->status.owner; inode->i_gid = 0; inode->i_size = vnode->status.size; - inode->i_ctime.tv_sec = vnode->status.mtime_server; - inode->i_ctime.tv_nsec = 0; - inode->i_atime = inode->i_mtime = inode->i_ctime; + inode->i_mtime.tv_sec = vnode->status.mtime_server; + inode->i_mtime.tv_nsec = 0; + inode->i_atime = inode->i_ctime = inode->i_mtime; inode->i_blocks = 0; inode->i_generation = vnode->fid.unique; inode->i_version = vnode->status.data_version; @@ -374,16 +374,29 @@ error_unlock: /* * read the attributes of an inode */ -int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, - struct kstat *stat) +int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { - struct inode *inode; - - inode = dentry->d_inode; + struct inode *inode = dentry->d_inode; _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); generic_fillattr(inode, stat); + + stat->result_mask &= ~(XSTAT_ATIME | XSTAT_CTIME | XSTAT_BLOCKS); + stat->result_mask |= XSTAT_GEN | XSTAT_VERSION; + stat->gen = inode->i_generation; + stat->version = inode->i_version; + + if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags)) + stat->information |= XSTAT_INFO_AUTODIR; + + if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) + stat->information |= XSTAT_INFO_FABRICATED; + else + stat->information |= XSTAT_INFO_REMOTE; + + stat->information |= + XSTAT_INFO_NONSYSTEM_OWNERSHIP | XSTAT_INFO_HAS_ACL; return 0; } diff --git a/fs/afs/super.c b/fs/afs/super.c index f02b31e..1f13b48 100644 --- a/fs/afs/super.c +++ b/fs/afs/super.c @@ -314,6 +314,13 @@ static int afs_fill_super(struct super_block *sb, sb->s_bdi = &as->volume->bdi; strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id)); + /* construct a volume ID from the AFS volume ID and type */ + sb->s_volume_id[4] = as->volume->type; + sb->s_volume_id[3] = as->volume->vid >> 0; + sb->s_volume_id[2] = as->volume->vid >> 8; + sb->s_volume_id[1] = as->volume->vid >> 16; + sb->s_volume_id[0] = as->volume->vid >> 24; + /* allocate the root inode and dentry */ fid.vid = as->volume->vid; fid.vnode = 1;