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Bugfixes for the NFS client.

Browse Source 
Fix a nasty Oops in the NFSv4 getacl code, another source of infinite loops
 in the NFSv4 state recovery code, and a regression in NFSv4.1 session
 initialisation.
 Also deal with an NFSv4.1 memory leak.
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Merge tag 'nfs-for-3.3-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Bugfixes for the NFS client.

Fix a nasty Oops in the NFSv4 getacl code, another source of infinite
loops in the NFSv4 state recovery code, and a regression in NFSv4.1
session initialisation.

Also deal with an NFSv4.1 memory leak.

* tag 'nfs-for-3.3-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4: fix server_scope memory leak
  NFSv4.1: Fix a NFSv4.1 session initialisation regression
  NFSv4: Ensure we throw out bad delegation stateids on NFS4ERR_BAD_STATEID
  NFSv4: Fix an Oops in the NFSv4 getacl code
This commit is contained in:
Linus Torvalds 2012-02-22 08:43:35 -08:00
commit 437cf4c7b7
4 changed files with 62 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

130
fs/nfs/nfs4proc.c
View File

@ -3575,8 +3575,8 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
}
if (npages > 1) {
/* for decoding across pages */
args.acl_scratch = alloc_page(GFP_KERNEL);
if (!args.acl_scratch)
res.acl_scratch = alloc_page(GFP_KERNEL);
if (!res.acl_scratch)
goto out_free;
}
args.acl_len = npages * PAGE_SIZE;
@ -3612,8 +3612,8 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
for (i = 0; i < npages; i++)
if (pages[i])
__free_page(pages[i]);
if (args.acl_scratch)
__free_page(args.acl_scratch);
if (res.acl_scratch)
__free_page(res.acl_scratch);
return ret;
}
@ -4883,8 +4883,10 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
clp->cl_rpcclient->cl_auth->au_flavor);
res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
if (unlikely(!res.server_scope))
return -ENOMEM;
if (unlikely(!res.server_scope)) {
status = -ENOMEM;
goto out;
}
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (!status)
@ -4901,12 +4903,13 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
clp->server_scope = NULL;
}
if (!clp->server_scope)
if (!clp->server_scope) {
clp->server_scope = res.server_scope;
else
kfree(res.server_scope);
goto out;
}
}
kfree(res.server_scope);
out:
dprintk("<-- %s status= %d\n", __func__, status);
return status;
}
@ -5008,37 +5011,53 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
return status;
}
static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
{
return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
}
static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
struct nfs4_slot *new,
u32 max_slots,
u32 ivalue)
{
struct nfs4_slot *old = NULL;
u32 i;
spin_lock(&tbl->slot_tbl_lock);
if (new) {
old = tbl->slots;
tbl->slots = new;
tbl->max_slots = max_slots;
}
tbl->highest_used_slotid = -1; /* no slot is currently used */
for (i = 0; i < tbl->max_slots; i++)
tbl->slots[i].seq_nr = ivalue;
spin_unlock(&tbl->slot_tbl_lock);
kfree(old);
}
/*
* Reset a slot table
* (re)Initialise a slot table
*/
static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
int ivalue)
static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
u32 ivalue)
{
struct nfs4_slot *new = NULL;
int i;
int ret = 0;
int ret = -ENOMEM;
dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
max_reqs, tbl->max_slots);
/* Does the newly negotiated max_reqs match the existing slot table? */
if (max_reqs != tbl->max_slots) {
ret = -ENOMEM;
new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
GFP_NOFS);
new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
if (!new)
goto out;
ret = 0;
kfree(tbl->slots);
}
spin_lock(&tbl->slot_tbl_lock);
if (new) {
tbl->slots = new;
tbl->max_slots = max_reqs;
}
for (i = 0; i < tbl->max_slots; ++i)
tbl->slots[i].seq_nr = ivalue;
spin_unlock(&tbl->slot_tbl_lock);
ret = 0;
nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
tbl, tbl->slots, tbl->max_slots);
out:
@ -5060,36 +5079,6 @@ static void nfs4_destroy_slot_tables(struct nfs4_session *session)
return;
}
/*
* Initialize slot table
*/
static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
int max_slots, int ivalue)
{
struct nfs4_slot *slot;
int ret = -ENOMEM;
BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
if (!slot)
goto out;
ret = 0;
spin_lock(&tbl->slot_tbl_lock);
tbl->max_slots = max_slots;
tbl->slots = slot;
tbl->highest_used_slotid = -1; /* no slot is currently used */
spin_unlock(&tbl->slot_tbl_lock);
dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
tbl, tbl->slots, tbl->max_slots);
out:
dprintk("<-- %s: return %d\n", __func__, ret);
return ret;
}
/*
* Initialize or reset the forechannel and backchannel tables
*/
@ -5101,25 +5090,16 @@ static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
dprintk("--> %s\n", __func__);
/* Fore channel */
tbl = &ses->fc_slot_table;
if (tbl->slots == NULL) {
status = nfs4_init_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
if (status) /* -ENOMEM */
return status;
} else {
status = nfs4_reset_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
if (status)
return status;
}
status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
if (status) /* -ENOMEM */
return status;
/* Back channel */
tbl = &ses->bc_slot_table;
if (tbl->slots == NULL) {
status = nfs4_init_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
if (status)
/* Fore and back channel share a connection so get
* both slot tables or neither */
nfs4_destroy_slot_tables(ses);
} else
status = nfs4_reset_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
if (status && tbl->slots == NULL)
/* Fore and back channel share a connection so get
* both slot tables or neither */
nfs4_destroy_slot_tables(ses);
return status;
}

2
fs/nfs/nfs4state.c
View File

@ -1132,6 +1132,8 @@ void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4
{
struct nfs_client *clp = server->nfs_client;
if (test_and_clear_bit(NFS_DELEGATED_STATE, &state->flags))
nfs_async_inode_return_delegation(state->inode, &state->stateid);
nfs4_state_mark_reclaim_nograce(clp, state);
nfs4_schedule_state_manager(clp);
}

5
fs/nfs/nfs4xdr.c
View File

@ -2522,7 +2522,6 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
args->acl_pages, args->acl_pgbase, args->acl_len);
xdr_set_scratch_buffer(xdr, page_address(args->acl_scratch), PAGE_SIZE);
encode_nops(&hdr);
}
@ -6032,6 +6031,10 @@ nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
struct compound_hdr hdr;
int status;
if (res->acl_scratch != NULL) {
void *p = page_address(res->acl_scratch);
xdr_set_scratch_buffer(xdr, p, PAGE_SIZE);
}
status = decode_compound_hdr(xdr, &hdr);
if (status)
goto out;

2
include/linux/nfs_xdr.h
View File

@ -614,7 +614,6 @@ struct nfs_getaclargs {
size_t acl_len;
unsigned int acl_pgbase;
struct page ** acl_pages;
struct page * acl_scratch;
struct nfs4_sequence_args seq_args;
};
@ -624,6 +623,7 @@ struct nfs_getaclres {
size_t acl_len;
size_t acl_data_offset;
int acl_flags;
struct page * acl_scratch;
struct nfs4_sequence_res seq_res;
};