diff options
| -rw-r--r-- | fs/nfs/inode.c | 5 | ||||
| -rw-r--r-- | fs/nfs/namespace.c | 9 | ||||
| -rw-r--r-- | fs/nfs/nfs4proc.c | 46 | ||||
| -rw-r--r-- | include/linux/nfs_fs.h | 1 | ||||
| -rw-r--r-- | include/linux/nfs_xdr.h | 1 |
5 files changed, 60 insertions, 2 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 0d8302e59d6..ee13cb01b56 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -888,7 +888,10 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); /* Deal with crossing mountpoints */ if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { - inode->i_op = &nfs_mountpoint_inode_operations; + if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) + inode->i_op = &nfs_referral_inode_operations; + else + inode->i_op = &nfs_mountpoint_inode_operations; inode->i_fop = NULL; } } else if (S_ISLNK(inode->i_mode)) diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c index e426516c111..8ca44b7b25c 100644 --- a/fs/nfs/namespace.c +++ b/fs/nfs/namespace.c @@ -58,7 +58,10 @@ static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd) if (err != 0) goto out_err; - mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr); + if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL) + mnt = nfs_do_refmount(nd->mnt, nd->dentry); + else + mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr); err = PTR_ERR(mnt); if (IS_ERR(mnt)) goto out_err; @@ -94,6 +97,10 @@ struct inode_operations nfs_mountpoint_inode_operations = { .getattr = nfs_getattr, }; +struct inode_operations nfs_referral_inode_operations = { + .follow_link = nfs_follow_mountpoint, +}; + static void nfs_expire_automounts(void *data) { struct list_head *list = (struct list_head *)data; diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 90ee21a07b3..3300e35d74a 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1462,6 +1462,50 @@ out: return nfs4_map_errors(status); } +/* + * Get locations and (maybe) other attributes of a referral. + * Note that we'll actually follow the referral later when + * we detect fsid mismatch in inode revalidation + */ +static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle) +{ + int status = -ENOMEM; + struct page *page = NULL; + struct nfs4_fs_locations *locations = NULL; + struct dentry dentry = {}; + + page = alloc_page(GFP_KERNEL); + if (page == NULL) + goto out; + locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); + if (locations == NULL) + goto out; + + dentry.d_name.name = name->name; + dentry.d_name.len = name->len; + status = nfs4_proc_fs_locations(dir, &dentry, locations, page); + if (status != 0) + goto out; + /* Make sure server returned a different fsid for the referral */ + if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { + dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name); + status = -EIO; + goto out; + } + + memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); + fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL; + if (!fattr->mode) + fattr->mode = S_IFDIR; + memset(fhandle, 0, sizeof(struct nfs_fh)); +out: + if (page) + __free_page(page); + if (locations) + kfree(locations); + return status; +} + static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) { struct nfs4_getattr_arg args = { @@ -1566,6 +1610,8 @@ static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name, dprintk("NFS call lookup %s\n", name->name); status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); + if (status == -NFS4ERR_MOVED) + status = nfs4_get_referral(dir, name, fattr, fhandle); dprintk("NFS reply lookup: %d\n", status); return status; } diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 09271b10f9a..15279894911 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -409,6 +409,7 @@ extern void nfs_unregister_sysctl(void); */ extern struct list_head nfs_automount_list; extern struct inode_operations nfs_mountpoint_inode_operations; +extern struct inode_operations nfs_referral_inode_operations; extern int nfs_mountpoint_expiry_timeout; extern void nfs_release_automount_timer(void); diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index d6eea834872..7c7320fa51a 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -63,6 +63,7 @@ struct nfs_fattr { #define NFS_ATTR_FATTR 0x0002 /* post-op attributes */ #define NFS_ATTR_FATTR_V3 0x0004 /* NFSv3 attributes */ #define NFS_ATTR_FATTR_V4 0x0008 /* NFSv4 change attribute */ +#define NFS_ATTR_FATTR_V4_REFERRAL 0x0010 /* NFSv4 referral */ /* * Info on the file system |