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NFSv4: Save the owner/group name string when doing open 

...so that we can do the uid/gid mapping outside the asynchronous RPC
context.
This fixes a bug in the current NFSv4 atomic open code where the client
isn't able to determine what the true uid/gid fields of the file are,
(because the asynchronous nature of the OPEN call denies it the ability
to do an upcall) and so fills them with default values, marking the
inode as needing revalidation.
Unfortunately, in some cases, the VFS will do some additional sanity
checks on the file, and may override the server's decision to allow
the open because it sees the wrong owner/group fields.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-01-07 13:22:46 -05:00
parent e2fecb215b
commit 6926afd192
6 changed files with 162 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
fs/nfs/idmap.c
View File

@ -38,6 +38,89 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/nfs_idmap.h>
#include <linux/nfs_fs.h>
/**
* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
* @fattr: fully initialised struct nfs_fattr
* @owner_name: owner name string cache
* @group_name: group name string cache
*/
void nfs_fattr_init_names(struct nfs_fattr *fattr,
struct nfs4_string *owner_name,
struct nfs4_string *group_name)
{
fattr->owner_name = owner_name;
fattr->group_name = group_name;
}
static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
{
fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
kfree(fattr->owner_name->data);
}
static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
{
fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
kfree(fattr->group_name->data);
}
static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
struct nfs4_string *owner = fattr->owner_name;
__u32 uid;
if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
return false;
if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
fattr->uid = uid;
fattr->valid |= NFS_ATTR_FATTR_OWNER;
}
return true;
}
static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
struct nfs4_string *group = fattr->group_name;
__u32 gid;
if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
return false;
if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
fattr->gid = gid;
fattr->valid |= NFS_ATTR_FATTR_GROUP;
}
return true;
}
/**
* nfs_fattr_free_names - free up the NFSv4 owner and group strings
* @fattr: a fully initialised nfs_fattr structure
*/
void nfs_fattr_free_names(struct nfs_fattr *fattr)
{
if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
nfs_fattr_free_owner_name(fattr);
if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
nfs_fattr_free_group_name(fattr);
}
/**
* nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
* @server: pointer to the filesystem nfs_server structure
* @fattr: a fully initialised nfs_fattr structure
*
* This helper maps the cached NFSv4 owner/group strings in fattr into
* their numeric uid/gid equivalents, and then frees the cached strings.
*/
void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
{
if (nfs_fattr_map_owner_name(server, fattr))
nfs_fattr_free_owner_name(fattr);
if (nfs_fattr_map_group_name(server, fattr))
nfs_fattr_free_group_name(fattr);
}
static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
{

2
fs/nfs/inode.c
View File

@ -1019,6 +1019,8 @@ void nfs_fattr_init(struct nfs_fattr *fattr)
fattr->valid = 0;
fattr->time_start = jiffies;
fattr->gencount = nfs_inc_attr_generation_counter();
fattr->owner_name = NULL;
fattr->group_name = NULL;
}
struct nfs_fattr *nfs_alloc_fattr(void)

10
fs/nfs/nfs4proc.c
View File

@ -52,6 +52,7 @@
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/module.h>
#include <linux/nfs_idmap.h>
#include <linux/sunrpc/bc_xprt.h>
#include <linux/xattr.h>
#include <linux/utsname.h>
@ -760,6 +761,8 @@ struct nfs4_opendata {
struct nfs_openres o_res;
struct nfs_open_confirmargs c_arg;
struct nfs_open_confirmres c_res;
struct nfs4_string owner_name;
struct nfs4_string group_name;
struct nfs_fattr f_attr;
struct nfs_fattr dir_attr;
struct dentry *dir;
@ -783,6 +786,7 @@ static void nfs4_init_opendata_res(struct nfs4_opendata *p)
p->o_res.server = p->o_arg.server;
nfs_fattr_init(&p->f_attr);
nfs_fattr_init(&p->dir_attr);
nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
}
static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
@ -814,6 +818,7 @@ static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
p->o_arg.name = &dentry->d_name;
p->o_arg.server = server;
p->o_arg.bitmask = server->attr_bitmask;
p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
if (flags & O_CREAT) {
u32 *s;
@ -850,6 +855,7 @@ static void nfs4_opendata_free(struct kref *kref)
dput(p->dir);
dput(p->dentry);
nfs_sb_deactive(sb);
nfs_fattr_free_names(&p->f_attr);
kfree(p);
}
@ -1574,6 +1580,8 @@ static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
if (status != 0 || !data->rpc_done)
return status;
nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
nfs_refresh_inode(dir, o_res->dir_attr);
if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
@ -1606,6 +1614,8 @@ static int _nfs4_proc_open(struct nfs4_opendata *data)
return status;
}
nfs_fattr_map_and_free_names(server, &data->f_attr);
if (o_arg->open_flags & O_CREAT) {
update_changeattr(dir, &o_res->cinfo);
nfs_post_op_update_inode(dir, o_res->dir_attr);

106
fs/nfs/nfs4xdr.c
View File

@ -2298,7 +2298,7 @@ static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_getfh(xdr, &hdr);
encode_getfattr(xdr, args->bitmask, &hdr);
encode_restorefh(xdr, &hdr);
encode_getfattr(xdr, args->bitmask, &hdr);
encode_getfattr(xdr, args->dir_bitmask, &hdr);
encode_nops(&hdr);
}
@ -3792,7 +3792,8 @@ out_overflow:
}
static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
const struct nfs_server *server, uint32_t *uid, int may_sleep)
const struct nfs_server *server, uint32_t *uid,
struct nfs4_string *owner_name)
{
uint32_t len;
__be32 *p;
@ -3809,8 +3810,12 @@ static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
p = xdr_inline_decode(xdr, len);
if (unlikely(!p))
goto out_overflow;
if (!may_sleep) {
/* do nothing */
if (owner_name != NULL) {
owner_name->data = kmemdup(p, len, GFP_NOWAIT);
if (owner_name->data != NULL) {
owner_name->len = len;
ret = NFS_ATTR_FATTR_OWNER_NAME;
}
} else if (len < XDR_MAX_NETOBJ) {
if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
ret = NFS_ATTR_FATTR_OWNER;
@ -3830,7 +3835,8 @@ out_overflow:
}
static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
const struct nfs_server *server, uint32_t *gid, int may_sleep)
const struct nfs_server *server, uint32_t *gid,
struct nfs4_string *group_name)
{
uint32_t len;
__be32 *p;
@ -3847,8 +3853,12 @@ static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
p = xdr_inline_decode(xdr, len);
if (unlikely(!p))
goto out_overflow;
if (!may_sleep) {
/* do nothing */
if (group_name != NULL) {
group_name->data = kmemdup(p, len, GFP_NOWAIT);
if (group_name->data != NULL) {
group_name->len = len;
ret = NFS_ATTR_FATTR_GROUP_NAME;
}
} else if (len < XDR_MAX_NETOBJ) {
if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
ret = NFS_ATTR_FATTR_GROUP;
@ -4285,7 +4295,7 @@ xdr_error:
static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
struct nfs_fattr *fattr, struct nfs_fh *fh,
const struct nfs_server *server, int may_sleep)
const struct nfs_server *server)
{
int status;
umode_t fmode = 0;
@ -4352,12 +4362,12 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
goto xdr_error;
fattr->valid |= status;
status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, may_sleep);
status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
if (status < 0)
goto xdr_error;
fattr->valid |= status;
status = decode_attr_group(xdr, bitmap, server, &fattr->gid, may_sleep);
status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
if (status < 0)
goto xdr_error;
fattr->valid |= status;
@ -4398,7 +4408,7 @@ xdr_error:
}
static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
struct nfs_fh *fh, const struct nfs_server *server, int may_sleep)
struct nfs_fh *fh, const struct nfs_server *server)
{
__be32 *savep;
uint32_t attrlen,
@ -4417,7 +4427,7 @@ static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fat
if (status < 0)
goto xdr_error;
status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, server, may_sleep);
status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, server);
if (status < 0)
goto xdr_error;
@ -4428,9 +4438,9 @@ xdr_error:
}
static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
const struct nfs_server *server, int may_sleep)
const struct nfs_server *server)
{
return decode_getfattr_generic(xdr, fattr, NULL, server, may_sleep);
return decode_getfattr_generic(xdr, fattr, NULL, server);
}
/*
@ -5711,8 +5721,7 @@ static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
status = decode_open_downgrade(xdr, res);
if (status != 0)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -5738,8 +5747,7 @@ static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
status = decode_access(xdr, res);
if (status != 0)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -5768,8 +5776,7 @@ static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
status = decode_getfh(xdr, res->fh);
if (status)
goto out;
status = decode_getfattr(xdr, res->fattr, res->server
,!RPC_IS_ASYNC(rqstp->rq_task));
status = decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -5795,8 +5802,7 @@ static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
goto out;
status = decode_getfh(xdr, res->fh);
if (status == 0)
status = decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
status = decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -5822,8 +5828,7 @@ static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
status = decode_remove(xdr, &res->cinfo);
if (status)
goto out;
decode_getfattr(xdr, res->dir_attr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->dir_attr, res->server);
out:
return status;
}
@ -5856,14 +5861,12 @@ static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
if (status)
goto out;
/* Current FH is target directory */
if (decode_getfattr(xdr, res->new_fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
if (decode_getfattr(xdr, res->new_fattr, res->server))
goto out;
status = decode_restorefh(xdr);
if (status)
goto out;
decode_getfattr(xdr, res->old_fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->old_fattr, res->server);
out:
return status;
}
@ -5899,14 +5902,12 @@ static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
* Note order: OP_LINK leaves the directory as the current
* filehandle.
*/
if (decode_getfattr(xdr, res->dir_attr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
if (decode_getfattr(xdr, res->dir_attr, res->server))
goto out;
status = decode_restorefh(xdr);
if (status)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -5938,14 +5939,12 @@ static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
status = decode_getfh(xdr, res->fh);
if (status)
goto out;
if (decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
if (decode_getfattr(xdr, res->fattr, res->server))
goto out;
status = decode_restorefh(xdr);
if (status)
goto out;
decode_getfattr(xdr, res->dir_fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->dir_fattr, res->server);
out:
return status;
}
@ -5977,8 +5976,7 @@ static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
status = decode_putfh(xdr);
if (status)
goto out;
status = decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
status = decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6076,8 +6074,7 @@ static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
* an ESTALE error. Shouldn't be a problem,
* though, since fattr->valid will remain unset.
*/
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6108,13 +6105,11 @@ static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
goto out;
if (decode_getfh(xdr, &res->fh) != 0)
goto out;
if (decode_getfattr(xdr, res->f_attr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
if (decode_getfattr(xdr, res->f_attr, res->server) != 0)
goto out;
if (decode_restorefh(xdr) != 0)
goto out;
decode_getfattr(xdr, res->dir_attr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->dir_attr, res->server);
out:
return status;
}
@ -6162,8 +6157,7 @@ static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
status = decode_open(xdr, res);
if (status)
goto out;
decode_getfattr(xdr, res->f_attr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->f_attr, res->server);
out:
return status;
}
@ -6190,8 +6184,7 @@ static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
status = decode_setattr(xdr);
if (status)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6371,8 +6364,7 @@ static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
if (status)
goto out;
if (res->fattr)
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
if (!status)
status = res->count;
out:
@ -6401,8 +6393,7 @@ static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
if (status)
goto out;
if (res->fattr)
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6561,8 +6552,7 @@ static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
status = decode_delegreturn(xdr);
if (status != 0)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6591,8 +6581,7 @@ static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
goto out;
xdr_enter_page(xdr, PAGE_SIZE);
status = decode_getfattr(xdr, &res->fs_locations->fattr,
res->fs_locations->server,
!RPC_IS_ASYNC(req->rq_task));
res->fs_locations->server);
out:
return status;
}
@ -6841,8 +6830,7 @@ static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
status = decode_layoutcommit(xdr, rqstp, res);
if (status)
goto out;
decode_getfattr(xdr, res->fattr, res->server,
!RPC_IS_ASYNC(rqstp->rq_task));
decode_getfattr(xdr, res->fattr, res->server);
out:
return status;
}
@ -6973,7 +6961,7 @@ int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
goto out_overflow;
if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
entry->server, 1) < 0)
entry->server) < 0)
goto out_overflow;
if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
entry->ino = entry->fattr->mounted_on_fileid;

8
include/linux/nfs_idmap.h
View File

@ -66,6 +66,8 @@ struct idmap_msg {
/* Forward declaration to make this header independent of others */
struct nfs_client;
struct nfs_server;
struct nfs_fattr;
struct nfs4_string;
#ifdef CONFIG_NFS_USE_NEW_IDMAPPER
@ -97,6 +99,12 @@ void nfs_idmap_delete(struct nfs_client *);
#endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
void nfs_fattr_init_names(struct nfs_fattr *fattr,
struct nfs4_string *owner_name,
struct nfs4_string *group_name);
void nfs_fattr_free_names(struct nfs_fattr *);
void nfs_fattr_map_and_free_names(struct nfs_server *, struct nfs_fattr *);
int nfs_map_name_to_uid(const struct nfs_server *, const char *, size_t, __u32 *);
int nfs_map_group_to_gid(const struct nfs_server *, const char *, size_t, __u32 *);
int nfs_map_uid_to_name(const struct nfs_server *, __u32, char *, size_t);

17
include/linux/nfs_xdr.h
View File

@ -18,6 +18,11 @@
/* Forward declaration for NFS v3 */
struct nfs4_secinfo_flavors;
struct nfs4_string {
unsigned int len;
char *data;
};
struct nfs_fsid {
uint64_t major;
uint64_t minor;
@ -61,6 +66,8 @@ struct nfs_fattr {
struct timespec pre_ctime; /* pre_op_attr.ctime */
unsigned long time_start;
unsigned long gencount;
struct nfs4_string *owner_name;
struct nfs4_string *group_name;
};
#define NFS_ATTR_FATTR_TYPE (1U << 0)
@ -85,6 +92,8 @@ struct nfs_fattr {
#define NFS_ATTR_FATTR_V4_REFERRAL (1U << 19) /* NFSv4 referral */
#define NFS_ATTR_FATTR_MOUNTPOINT (1U << 20) /* Treat as mountpoint */
#define NFS_ATTR_FATTR_MOUNTED_ON_FILEID (1U << 21)
#define NFS_ATTR_FATTR_OWNER_NAME (1U << 22)
#define NFS_ATTR_FATTR_GROUP_NAME (1U << 23)
#define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
| NFS_ATTR_FATTR_MODE \
@ -324,6 +333,7 @@ struct nfs_openargs {
const struct qstr * name;
const struct nfs_server *server; /* Needed for ID mapping */
const u32 * bitmask;
const u32 * dir_bitmask;
__u32 claim;
struct nfs4_sequence_args seq_args;
};
@ -342,6 +352,8 @@ struct nfs_openres {
__u32 do_recall;
__u64 maxsize;
__u32 attrset[NFS4_BITMAP_SIZE];
struct nfs4_string *owner;
struct nfs4_string *group_owner;
struct nfs4_sequence_res seq_res;
};
@ -778,11 +790,6 @@ struct nfs3_getaclres {
struct posix_acl * acl_default;
};
struct nfs4_string {
unsigned int len;
char *data;
};
#ifdef CONFIG_NFS_V4
typedef u64 clientid4;