From: Scott Mayhew <smayhew@redhat.com>
To: anna.schumaker@netapp.com, trond.myklebust@hammerspace.com
Cc: dhowells@redhat.com, viro@zeniv.linux.org.uk,
linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 19/26] NFS: Split nfs_parse_mount_options()
Date: Wed, 11 Sep 2019 12:16:14 -0400
Message-ID: <20190911161621.19832-20-smayhew@redhat.com> (raw)
In-Reply-To: <20190911161621.19832-1-smayhew@redhat.com>
From: David Howells <dhowells@redhat.com>
Split nfs_parse_mount_options() to move the prologue, list-splitting and
epilogue into one function and the per-option processing into another.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/nfs/fs_context.c | 126 ++++++++++++++++++++++++--------------------
fs/nfs/internal.h | 3 ++
2 files changed, 73 insertions(+), 56 deletions(-)
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index 5357430416d7..227a85f652b5 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -500,36 +500,18 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
}
/*
- * Error-check and convert a string of mount options from user space into
- * a data structure. The whole mount string is processed; bad options are
- * skipped as they are encountered. If there were no errors, return 1;
- * otherwise return 0 (zero).
+ * Parse a single mount option in "key[=val]" form.
*/
-int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
+static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
{
- char *p, *string;
- int rc, sloppy = 0, invalid_option = 0;
- unsigned short protofamily = AF_UNSPEC;
- unsigned short mountfamily = AF_UNSPEC;
-
- if (!raw) {
- dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
- return 1;
- }
- dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
-
- rc = security_sb_eat_lsm_opts(raw, &ctx->lsm_opts);
- if (rc)
- goto out_security_failure;
+ char *string;
+ int rc;
- while ((p = strsep(&raw, ",")) != NULL) {
+ {
substring_t args[MAX_OPT_ARGS];
unsigned long option;
int token;
- if (!*p)
- continue;
-
dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
token = match_token(p, nfs_mount_option_tokens, args);
@@ -738,7 +720,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
if (!rc) {
dfprintk(MOUNT, "NFS: unrecognized "
"security flavor\n");
- return 0;
+ return -EINVAL;
}
break;
case Opt_proto:
@@ -748,24 +730,24 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
token = match_token(string,
nfs_xprt_protocol_tokens, args);
- protofamily = AF_INET;
+ ctx->protofamily = AF_INET;
switch (token) {
case Opt_xprt_udp6:
- protofamily = AF_INET6;
+ ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->flags &= ~NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
- protofamily = AF_INET6;
+ ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->flags |= NFS_MOUNT_TCP;
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP;
break;
case Opt_xprt_rdma6:
- protofamily = AF_INET6;
+ ctx->protofamily = AF_INET6;
/* fall through */
case Opt_xprt_rdma:
/* vector side protocols to TCP */
@@ -777,7 +759,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
dfprintk(MOUNT, "NFS: unrecognized "
"transport protocol\n");
kfree(string);
- return 0;
+ return -EINVAL;
}
kfree(string);
break;
@@ -789,16 +771,16 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
nfs_xprt_protocol_tokens, args);
kfree(string);
- mountfamily = AF_INET;
+ ctx->mountfamily = AF_INET;
switch (token) {
case Opt_xprt_udp6:
- mountfamily = AF_INET6;
+ ctx->mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_udp:
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP;
break;
case Opt_xprt_tcp6:
- mountfamily = AF_INET6;
+ ctx->mountfamily = AF_INET6;
/* fall through */
case Opt_xprt_tcp:
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP;
@@ -807,7 +789,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: unrecognized "
"transport protocol\n");
- return 0;
+ return -EINVAL;
}
break;
case Opt_addr:
@@ -871,7 +853,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: invalid "
"lookupcache argument\n");
- return 0;
+ return -EINVAL;
};
break;
case Opt_fscache_uniq:
@@ -904,7 +886,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
default:
dfprintk(MOUNT, "NFS: invalid "
"local_lock argument\n");
- return 0;
+ return -EINVAL;
};
break;
@@ -912,7 +894,7 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
* Special options
*/
case Opt_sloppy:
- sloppy = 1;
+ ctx->sloppy = 1;
dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
break;
case Opt_userspace:
@@ -922,12 +904,53 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
break;
default:
- invalid_option = 1;
dfprintk(MOUNT, "NFS: unrecognized mount option "
"'%s'\n", p);
+ return -EINVAL;
}
}
+ return 0;
+
+out_invalid_address:
+ printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
+ return -EINVAL;
+out_invalid_value:
+ printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
+ return -EINVAL;
+out_nomem:
+ printk(KERN_INFO "NFS: not enough memory to parse option\n");
+ return -ENOMEM;
+}
+
+/*
+ * Error-check and convert a string of mount options from user space into
+ * a data structure. The whole mount string is processed; bad options are
+ * skipped as they are encountered. If there were no errors, return 1;
+ * otherwise return 0 (zero).
+ */
+int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
+{
+ char *p;
+ int rc, sloppy = 0, invalid_option = 0;
+
+ if (!raw) {
+ dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
+ return 1;
+ }
+ dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
+
+ rc = security_sb_eat_lsm_opts(raw, &ctx->lsm_opts);
+ if (rc)
+ goto out_security_failure;
+
+ while ((p = strsep(&raw, ",")) != NULL) {
+ if (!*p)
+ continue;
+ if (nfs_fs_context_parse_option(ctx, p) < 0)
+ invalid_option = true;
+ }
+
if (!sloppy && invalid_option)
return 0;
@@ -942,22 +965,26 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
* verify that any proto=/mountproto= options match the address
* families in the addr=/mountaddr= options.
*/
- if (protofamily != AF_UNSPEC &&
- protofamily != ctx->nfs_server.address.ss_family)
+ if (ctx->protofamily != AF_UNSPEC &&
+ ctx->protofamily != ctx->nfs_server.address.ss_family)
goto out_proto_mismatch;
- if (mountfamily != AF_UNSPEC) {
+ if (ctx->mountfamily != AF_UNSPEC) {
if (ctx->mount_server.addrlen) {
- if (mountfamily != ctx->mount_server.address.ss_family)
+ if (ctx->mountfamily != ctx->mount_server.address.ss_family)
goto out_mountproto_mismatch;
} else {
- if (mountfamily != ctx->nfs_server.address.ss_family)
+ if (ctx->mountfamily != ctx->nfs_server.address.ss_family)
goto out_mountproto_mismatch;
}
}
return 1;
+out_minorversion_mismatch:
+ printk(KERN_INFO "NFS: mount option vers=%u does not support "
+ "minorversion=%u\n", ctx->version, ctx->minorversion);
+ return 0;
out_mountproto_mismatch:
printk(KERN_INFO "NFS: mount server address does not match mountproto= "
"option\n");
@@ -965,23 +992,10 @@ int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx)
out_proto_mismatch:
printk(KERN_INFO "NFS: server address does not match proto= option\n");
return 0;
-out_invalid_address:
- printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
- return 0;
-out_invalid_value:
- printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
- return 0;
-out_minorversion_mismatch:
- printk(KERN_INFO "NFS: mount option vers=%u does not support "
- "minorversion=%u\n", ctx->version, ctx->minorversion);
- return 0;
out_migration_misuse:
printk(KERN_INFO
"NFS: 'migration' not supported for this NFS version\n");
- return 0;
-out_nomem:
- printk(KERN_INFO "NFS: not enough memory to parse option\n");
- return 0;
+ return -EINVAL;
out_security_failure:
printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
return 0;
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 632174d666a8..d084182f8e43 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -104,7 +104,10 @@ struct nfs_fs_context {
unsigned int version;
unsigned int minorversion;
char *fscache_uniq;
+ unsigned short protofamily;
+ unsigned short mountfamily;
bool need_mount;
+ bool sloppy;
struct {
struct sockaddr_storage address;
--
2.17.2
next prev parent reply index
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 16:15 [PATCH v3 00/26] nfs: Mount API conversion Scott Mayhew
2019-09-11 16:15 ` [PATCH v3 01/26] saner calling conventions for nfs_fs_mount_common() Scott Mayhew
2019-09-11 16:15 ` [PATCH v3 02/26] nfs: stash server into struct nfs_mount_info Scott Mayhew
2019-09-11 16:15 ` [PATCH v3 03/26] nfs: lift setting mount_info from nfs4_remote{,_referral}_mount Scott Mayhew
2019-09-11 16:15 ` [PATCH v3 04/26] nfs: fold nfs4_remote_fs_type and nfs4_remote_referral_fs_type Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 05/26] nfs: don't bother setting/restoring export_path around do_nfs_root_mount() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 06/26] nfs4: fold nfs_do_root_mount/nfs_follow_remote_path Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 07/26] nfs: lift setting mount_info from nfs_xdev_mount() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 08/26] nfs: stash nfs_subversion reference into nfs_mount_info Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 09/26] nfs: don't bother passing nfs_subversion to ->try_mount() and nfs_fs_mount_common() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 10/26] nfs: merge xdev and remote file_system_type Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 11/26] nfs: unexport nfs_fs_mount_common() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 12/26] nfs: don't pass nfs_subversion to ->create_server() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 13/26] nfs: get rid of mount_info ->fill_super() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 14/26] nfs_clone_sb_security(): simplify the check for server bogosity Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 15/26] nfs: get rid of ->set_security() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 16/26] NFS: Move mount parameterisation bits into their own file Scott Mayhew
2019-09-11 18:24 ` Chuck Lever
2019-09-12 17:35 ` Scott Mayhew
[not found] ` <014d1a8425545b633b982f63d78665b73bcf0075.camel@hammerspace.com>
2019-09-12 17:36 ` Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 17/26] NFS: Constify mount argument match tables Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 18/26] NFS: Rename struct nfs_parsed_mount_data to struct nfs_fs_context Scott Mayhew
2019-09-11 16:16 ` Scott Mayhew [this message]
2019-09-11 16:16 ` [PATCH v3 20/26] NFS: Deindent nfs_fs_context_parse_option() Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 21/26] NFS: Add a small buffer in nfs_fs_context to avoid string dup Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 22/26] NFS: Do some tidying of the parsing code Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 23/26] NFS: rename nfs_fs_context pointer arg in a few functions Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 24/26] NFS: Convert mount option parsing to use functionality from fs_parser.h Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 25/26] NFS: Add fs_context support Scott Mayhew
2019-09-11 16:16 ` [PATCH v3 26/26] NFS: Attach supplementary error information to fs_context Scott Mayhew
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