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author | J. Bruce Fields <bfields@redhat.com> | 2014-06-24 17:43:45 -0400 |
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committer | J. Bruce Fields <bfields@redhat.com> | 2014-07-08 17:14:27 -0400 |
commit | d5e2338324102dcf34aa25aeaf96064cc4d94dce (patch) | |
tree | 637478358b86076a8411e4de66a2271c1ac11487 | |
parent | bcaab953b1d3790c724a211f2452b574fd49a7ce (diff) | |
download | linux-d5e2338324102dcf34aa25aeaf96064cc4d94dce.tar.bz2 |
nfsd4: replace defer_free by svcxdr_tmpalloc
Avoid an extra allocation for the tmpbuf struct itself, and stop
ignoring some allocation failures.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
-rw-r--r-- | fs/nfsd/nfs4xdr.c | 46 | ||||
-rw-r--r-- | fs/nfsd/xdr4.h | 13 |
2 files changed, 26 insertions, 33 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index fea41046427c..46115f2c3074 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -181,25 +181,24 @@ static int zero_clientid(clientid_t *clid) } /** - * defer_free - mark an allocation as deferred freed + * svcxdr_tmpalloc - allocate memory to be freed after compound processing * @argp: NFSv4 compound argument structure * @p: pointer to be freed (with kfree()) * * Marks @p to be freed when processing the compound operation * described in @argp finishes. */ -static int -defer_free(struct nfsd4_compoundargs *argp, void *p) +static void * +svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len) { - struct tmpbuf *tb; + struct svcxdr_tmpbuf *tb; - tb = kmalloc(sizeof(*tb), GFP_KERNEL); + tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL); if (!tb) - return -ENOMEM; - tb->buf = p; + return NULL; tb->next = argp->to_free; argp->to_free = tb; - return 0; + return tb->buf; } /* @@ -212,13 +211,12 @@ defer_free(struct nfsd4_compoundargs *argp, void *p) static char * svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) { - char *p = kmalloc(len + 1, GFP_KERNEL); + char *p = svcxdr_tmpalloc(argp, len + 1); if (!p) return NULL; memcpy(p, buf, len); p[len] = '\0'; - defer_free(argp, p); return p; } @@ -234,19 +232,13 @@ svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len) */ static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes) { - if (p == argp->tmp) { - p = kmemdup(argp->tmp, nbytes, GFP_KERNEL); - if (!p) - return NULL; - } else { - BUG_ON(p != argp->tmpp); - argp->tmpp = NULL; - } - if (defer_free(argp, p)) { - kfree(p); + void *ret; + + ret = svcxdr_tmpalloc(argp, nbytes); + if (!ret) return NULL; - } else - return (char *)p; + memcpy(ret, p, nbytes); + return ret; } static __be32 @@ -309,12 +301,10 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval, if (nace > NFS4_ACL_MAX) return nfserr_fbig; - *acl = kmalloc(nfs4_acl_bytes(nace), GFP_KERNEL); + *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace)); if (*acl == NULL) return nfserr_jukebox; - defer_free(argp, *acl); - (*acl)->naces = nace; for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) { READ_BUF(16); len += 16; @@ -1487,13 +1477,12 @@ nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_sta INIT_LIST_HEAD(&test_stateid->ts_stateid_list); for (i = 0; i < test_stateid->ts_num_ids; i++) { - stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL); + stateid = svcxdr_tmpalloc(argp, sizeof(*stateid)); if (!stateid) { status = nfserrno(-ENOMEM); goto out; } - defer_free(argp, stateid); INIT_LIST_HEAD(&stateid->ts_id_list); list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list); @@ -3977,9 +3966,8 @@ int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp) kfree(args->tmpp); args->tmpp = NULL; while (args->to_free) { - struct tmpbuf *tb = args->to_free; + struct svcxdr_tmpbuf *tb = args->to_free; args->to_free = tb->next; - kfree(tb->buf); kfree(tb); } return 1; diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index 4379cc871607..efce9010cad4 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -478,6 +478,14 @@ struct nfsd4_op { bool nfsd4_cache_this_op(struct nfsd4_op *); +/* + * Memory needed just for the duration of processing one compound: + */ +struct svcxdr_tmpbuf { + struct svcxdr_tmpbuf *next; + char buf[]; +}; + struct nfsd4_compoundargs { /* scratch variables for XDR decode */ __be32 * p; @@ -486,10 +494,7 @@ struct nfsd4_compoundargs { int pagelen; __be32 tmp[8]; __be32 * tmpp; - struct tmpbuf { - struct tmpbuf *next; - void *buf; - } *to_free; + struct svcxdr_tmpbuf *to_free; struct svc_rqst *rqstp; |