diff options
author | David Howells <dhowells@redhat.com> | 2019-12-10 07:31:10 -0500 |
---|---|---|
committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2020-01-15 10:15:17 -0500 |
commit | e558100fda7e8c7888f523920214bcb35ed9382b (patch) | |
tree | 062da61c7b41132239f3a31c0523c7ed83be460b | |
parent | 48be8a66cf98accca033c42d214698dd64ac4f79 (diff) | |
download | linux-e558100fda7e8c7888f523920214bcb35ed9382b.tar.bz2 |
NFS: Do some tidying of the parsing code
Do some tidying of the parsing code, including:
(*) Returning 0/error rather than true/false.
(*) Putting the nfs_fs_context pointer first in some arg lists.
(*) Unwrap some lines that will now fit on one line.
(*) Provide unioned sockaddr/sockaddr_storage fields to avoid casts.
(*) nfs_parse_devname() can paste its return values directly into the
nfs_fs_context struct as that's where the caller puts them.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
-rw-r--r-- | fs/nfs/fs_context.c | 126 | ||||
-rw-r--r-- | fs/nfs/internal.h | 16 | ||||
-rw-r--r-- | fs/nfs/super.c | 2 |
3 files changed, 66 insertions, 78 deletions
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c index 2921c5820c31..44531443a92b 100644 --- a/fs/nfs/fs_context.c +++ b/fs/nfs/fs_context.c @@ -343,8 +343,9 @@ static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx) * Add 'flavor' to 'auth_info' if not already present. * Returns true if 'flavor' ends up in the list, false otherwise */ -static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, - rpc_authflavor_t flavor) +static int nfs_auth_info_add(struct nfs_fs_context *ctx, + struct nfs_auth_info *auth_info, + rpc_authflavor_t flavor) { unsigned int i; unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); @@ -352,26 +353,27 @@ static bool nfs_auth_info_add(struct nfs_auth_info *auth_info, /* make sure this flavor isn't already in the list */ for (i = 0; i < auth_info->flavor_len; i++) { if (flavor == auth_info->flavors[i]) - return true; + return 0; } if (auth_info->flavor_len + 1 >= max_flavor_len) { dfprintk(MOUNT, "NFS: too many sec= flavors\n"); - return false; + return -EINVAL; } auth_info->flavors[auth_info->flavor_len++] = flavor; - return true; + return 0; } /* * Parse the value of the 'sec=' option. */ -static int nfs_parse_security_flavors(char *value, struct nfs_fs_context *ctx) +static int nfs_parse_security_flavors(struct nfs_fs_context *ctx, char *value) { substring_t args[MAX_OPT_ARGS]; rpc_authflavor_t pseudoflavor; char *p; + int ret; dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value); @@ -413,19 +415,20 @@ static int nfs_parse_security_flavors(char *value, struct nfs_fs_context *ctx) default: dfprintk(MOUNT, "NFS: sec= option '%s' not recognized\n", p); - return 0; + return -EINVAL; } - if (!nfs_auth_info_add(&ctx->auth_info, pseudoflavor)) - return 0; + ret = nfs_auth_info_add(ctx, &ctx->auth_info, pseudoflavor); + if (ret < 0) + return ret; } - return 1; + return 0; } -static int nfs_parse_version_string(char *string, - struct nfs_fs_context *ctx, - substring_t *args) +static int nfs_parse_version_string(struct nfs_fs_context *ctx, + char *string, + substring_t *args) { ctx->flags &= ~NFS_MOUNT_VER3; switch (match_token(string, nfs_vers_tokens, args)) { @@ -456,9 +459,10 @@ static int nfs_parse_version_string(char *string, ctx->minorversion = 2; break; default: - return 0; + dfprintk(MOUNT, "NFS: Unsupported NFS version\n"); + return -EINVAL; } - return 1; + return 0; } static int nfs_get_option_str(substring_t args[], char **option) @@ -513,7 +517,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) { substring_t args[MAX_OPT_ARGS]; char *string; - int token, rc; + int token, ret; dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p); @@ -553,13 +557,11 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) break; case Opt_lock: ctx->flags &= ~NFS_MOUNT_NONLM; - ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | - NFS_MOUNT_LOCAL_FCNTL); + ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; case Opt_nolock: ctx->flags |= NFS_MOUNT_NONLM; - ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | - NFS_MOUNT_LOCAL_FCNTL); + ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); break; case Opt_udp: ctx->flags &= ~NFS_MOUNT_TCP; @@ -692,29 +694,25 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) string = match_strdup(args); if (string == NULL) goto out_nomem; - rc = nfs_parse_version_string(string, ctx, args); + ret = nfs_parse_version_string(ctx, string, args); kfree(string); - if (!rc) - goto out_invalid_value; + if (ret < 0) + return ret; break; case Opt_sec: string = match_strdup(args); if (string == NULL) goto out_nomem; - rc = nfs_parse_security_flavors(string, ctx); + ret = nfs_parse_security_flavors(ctx, string); kfree(string); - if (!rc) { - dfprintk(MOUNT, "NFS: unrecognized " - "security flavor\n"); - return -EINVAL; - } + if (ret < 0) + return ret; break; case Opt_proto: string = match_strdup(args); if (string == NULL) goto out_nomem; - token = match_token(string, - nfs_xprt_protocol_tokens, args); + token = match_token(string, nfs_xprt_protocol_tokens, args); ctx->protofamily = AF_INET; switch (token) { @@ -742,9 +740,8 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) xprt_load_transport(string); break; default: - dfprintk(MOUNT, "NFS: unrecognized " - "transport protocol\n"); kfree(string); + dfprintk(MOUNT, "NFS: unrecognized transport protocol\n"); return -EINVAL; } kfree(string); @@ -753,8 +750,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) string = match_strdup(args); if (string == NULL) goto out_nomem; - token = match_token(string, - nfs_xprt_protocol_tokens, args); + token = match_token(string, nfs_xprt_protocol_tokens, args); kfree(string); ctx->mountfamily = AF_INET; @@ -773,8 +769,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) break; case Opt_xprt_rdma: /* not used for side protocols */ default: - dfprintk(MOUNT, "NFS: unrecognized " - "transport protocol\n"); + dfprintk(MOUNT, "NFS: unrecognized transport protocol\n"); return -EINVAL; } break; @@ -784,9 +779,8 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) goto out_nomem; ctx->nfs_server.addrlen = rpc_pton(ctx->net, string, strlen(string), - (struct sockaddr *) &ctx->nfs_server.address, - sizeof(ctx->nfs_server.address)); + sizeof(ctx->nfs_server._address)); kfree(string); if (ctx->nfs_server.addrlen == 0) goto out_invalid_address; @@ -796,8 +790,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) goto out_nomem; break; case Opt_mounthost: - if (nfs_get_option_str(args, - &ctx->mount_server.hostname)) + if (nfs_get_option_str(args, &ctx->mount_server.hostname)) goto out_nomem; break; case Opt_mountaddr: @@ -806,9 +799,8 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) goto out_nomem; ctx->mount_server.addrlen = rpc_pton(ctx->net, string, strlen(string), - (struct sockaddr *) &ctx->mount_server.address, - sizeof(ctx->mount_server.address)); + sizeof(ctx->mount_server._address)); kfree(string); if (ctx->mount_server.addrlen == 0) goto out_invalid_address; @@ -822,8 +814,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) string = match_strdup(args); if (string == NULL) goto out_nomem; - token = match_token(string, - nfs_lookupcache_tokens, args); + token = match_token(string, nfs_lookupcache_tokens, args); kfree(string); switch (token) { case Opt_lookupcache_all: @@ -837,8 +828,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; break; default: - dfprintk(MOUNT, "NFS: invalid " - "lookupcache argument\n"); + dfprintk(MOUNT, "NFS: invalid lookupcache argument\n"); return -EINVAL; } break; @@ -851,8 +841,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) string = match_strdup(args); if (string == NULL) goto out_nomem; - token = match_token(string, nfs_local_lock_tokens, - args); + token = match_token(string, nfs_local_lock_tokens, args); kfree(string); switch (token) { case Opt_local_lock_all: @@ -870,8 +859,7 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) NFS_MOUNT_LOCAL_FCNTL); break; default: - dfprintk(MOUNT, "NFS: invalid " - "local_lock argument\n"); + dfprintk(MOUNT, "NFS: invalid local_lock argument\n"); return -EINVAL; } break; @@ -885,13 +873,11 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p) break; case Opt_userspace: case Opt_deprecated: - dfprintk(MOUNT, "NFS: ignoring mount option " - "'%s'\n", p); + dfprintk(MOUNT, "NFS: ignoring mount option '%s'\n", p); break; default: - dfprintk(MOUNT, "NFS: unrecognized mount option " - "'%s'\n", p); + dfprintk(MOUNT, "NFS: unrecognized mount option '%s'\n", p); return -EINVAL; } @@ -951,15 +937,15 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx) * families in the addr=/mountaddr= options. */ if (ctx->protofamily != AF_UNSPEC && - ctx->protofamily != ctx->nfs_server.address.ss_family) + ctx->protofamily != ctx->nfs_server.address.sa_family) goto out_proto_mismatch; if (ctx->mountfamily != AF_UNSPEC) { if (ctx->mount_server.addrlen) { - if (ctx->mountfamily != ctx->mount_server.address.ss_family) + if (ctx->mountfamily != ctx->mount_server.address.sa_family) goto out_mountproto_mismatch; } else { - if (ctx->mountfamily != ctx->nfs_server.address.ss_family) + if (ctx->mountfamily != ctx->nfs_server.address.sa_family) goto out_mountproto_mismatch; } } @@ -995,9 +981,9 @@ out_security_failure: * * Note: caller frees hostname and export path, even on error. */ -static int nfs_parse_devname(const char *dev_name, - char **hostname, size_t maxnamlen, - char **export_path, size_t maxpathlen) +static int nfs_parse_devname(struct nfs_fs_context *ctx, + const char *dev_name, + size_t maxnamlen, size_t maxpathlen) { size_t len; char *end; @@ -1033,17 +1019,17 @@ static int nfs_parse_devname(const char *dev_name, goto out_hostname; /* N.B. caller will free nfs_server.hostname in all cases */ - *hostname = kstrndup(dev_name, len, GFP_KERNEL); - if (*hostname == NULL) + ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL); + if (!ctx->nfs_server.hostname) goto out_nomem; len = strlen(++end); if (len > maxpathlen) goto out_path; - *export_path = kstrndup(end, len, GFP_KERNEL); - if (!*export_path) + ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL); + if (!ctx->nfs_server.export_path) goto out_nomem; - dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path); + dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path); return 0; out_bad_devname: @@ -1064,7 +1050,7 @@ out_path: } /* - * Validate the NFS2/NFS3 mount data + * Parse monolithic NFS2/NFS3 mount data * - fills in the mount root filehandle * * For option strings, user space handles the following behaviors: @@ -1393,11 +1379,7 @@ int nfs_validate_text_mount_data(void *options, nfs_set_port(sap, &ctx->nfs_server.port, port); - return nfs_parse_devname(dev_name, - &ctx->nfs_server.hostname, - max_namelen, - &ctx->nfs_server.export_path, - max_pathlen); + return nfs_parse_devname(ctx, dev_name, max_namelen, max_pathlen); #if !IS_ENABLED(CONFIG_NFS_V4) out_v4_not_compiled: diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 5342f3e4d565..003c2b8eb1e6 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -82,11 +82,11 @@ struct nfs_client_initdata { * In-kernel mount arguments */ struct nfs_fs_context { - int flags; + unsigned int flags; /* NFS{,4}_MOUNT_* flags */ unsigned int rsize, wsize; unsigned int timeo, retrans; - unsigned int acregmin, acregmax, - acdirmin, acdirmax; + unsigned int acregmin, acregmax; + unsigned int acdirmin, acdirmax; unsigned int namlen; unsigned int options; unsigned int bsize; @@ -102,7 +102,10 @@ struct nfs_fs_context { bool sloppy; struct { - struct sockaddr_storage address; + union { + struct sockaddr address; + struct sockaddr_storage _address; + }; size_t addrlen; char *hostname; u32 version; @@ -111,7 +114,10 @@ struct nfs_fs_context { } mount_server; struct { - struct sockaddr_storage address; + union { + struct sockaddr address; + struct sockaddr_storage _address; + }; size_t addrlen; char *hostname; char *export_path; diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 83527515590e..59962bc0118f 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -816,7 +816,7 @@ static int nfs_request_mount(struct nfs_fs_context *cfg, /* * Construct the mount server's address. */ - if (cfg->mount_server.address.ss_family == AF_UNSPEC) { + if (cfg->mount_server.address.sa_family == AF_UNSPEC) { memcpy(request.sap, &cfg->nfs_server.address, cfg->nfs_server.addrlen); cfg->mount_server.addrlen = cfg->nfs_server.addrlen; |