diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/cifs/Kconfig | 8 | ||||
| -rw-r--r-- | fs/cifs/Makefile | 2 | ||||
| -rw-r--r-- | fs/cifs/cifsglob.h | 2 | ||||
| -rw-r--r-- | fs/cifs/cifsroot.c | 83 | ||||
| -rw-r--r-- | fs/cifs/connect.c | 17 |
5 files changed, 109 insertions, 3 deletions
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig index b16219e5dac9..99a22e57660e 100644 --- a/fs/cifs/Kconfig +++ b/fs/cifs/Kconfig @@ -211,3 +211,11 @@ config CIFS_FSCACHE Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data to be cached locally on disk through the general filesystem cache manager. If unsure, say N. + +config CIFS_ROOT + bool "SMB root file system (Experimental)" + depends on CIFS=y && IP_PNP + help + Enables root file system support over SMB protocol. + + Most people say N here. diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile index 41332f20055b..51bae9340842 100644 --- a/fs/cifs/Makefile +++ b/fs/cifs/Makefile @@ -21,3 +21,5 @@ cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o cifs-$(CONFIG_CIFS_SMB_DIRECT) += smbdirect.o + +cifs-$(CONFIG_CIFS_ROOT) += cifsroot.o diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 09b60ec5de3e..54e204589cb9 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -607,6 +607,7 @@ struct smb_vol { __u32 handle_timeout; /* persistent and durable handle timeout in ms */ unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */ __u16 compression; /* compression algorithm 0xFFFF default 0=disabled */ + bool rootfs:1; /* if it's a SMB root file system */ }; /** @@ -764,6 +765,7 @@ struct TCP_Server_Info { * reconnect. */ int nr_targets; + bool noblockcnt; /* use non-blocking connect() */ }; struct cifs_credits { diff --git a/fs/cifs/cifsroot.c b/fs/cifs/cifsroot.c new file mode 100644 index 000000000000..8760d9cbf25e --- /dev/null +++ b/fs/cifs/cifsroot.c @@ -0,0 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SMB root file system support + * + * Copyright (c) 2019 Paulo Alcantara <palcantara@suse.de> + */ +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/types.h> +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/root_dev.h> +#include <linux/kernel.h> +#include <linux/in.h> +#include <linux/inet.h> +#include <net/ipconfig.h> + +#define DEFAULT_MNT_OPTS \ + "vers=1.0,cifsacl,mfsymlinks,rsize=1048576,wsize=65536,uid=0,gid=0," \ + "hard,rootfs" + +static char root_dev[2048] __initdata = ""; +static char root_opts[1024] __initdata = DEFAULT_MNT_OPTS; + +static __be32 __init parse_srvaddr(char *start, char *end) +{ + char addr[sizeof("aaa.bbb.ccc.ddd")]; + int i = 0; + + while (start < end && i < sizeof(addr) - 1) { + if (isdigit(*start) || *start == '.') + addr[i++] = *start; + start++; + } + addr[i] = '\0'; + return in_aton(addr); +} + +/* cifsroot=//<server-ip>/<share>[,options] */ +static int __init cifs_root_setup(char *line) +{ + char *s; + int len; + __be32 srvaddr = htonl(INADDR_NONE); + + ROOT_DEV = Root_CIFS; + + if (strlen(line) > 3 && line[0] == '/' && line[1] == '/') { + s = strchr(&line[2], '/'); + if (!s || s[1] == '\0') + return 1; + + s = strchrnul(s, ','); + len = s - line + 1; + if (len <= sizeof(root_dev)) { + strlcpy(root_dev, line, len); + srvaddr = parse_srvaddr(&line[2], s); + if (*s) { + snprintf(root_opts, sizeof(root_opts), "%s,%s", + DEFAULT_MNT_OPTS, s + 1); + } + } + } + + root_server_addr = srvaddr; + + return 1; +} + +__setup("cifsroot=", cifs_root_setup); + +int __init cifs_root_data(char **dev, char **opts) +{ + if (!root_dev[0] || root_server_addr == htonl(INADDR_NONE)) { + printk(KERN_ERR "Root-CIFS: no SMB server address\n"); + return -1; + } + + *dev = root_dev; + *opts = root_opts; + + return 0; +} diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index e16b6cc1e31b..2850c3ce4391 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -96,7 +96,7 @@ enum { Opt_multiuser, Opt_sloppy, Opt_nosharesock, Opt_persistent, Opt_nopersistent, Opt_resilient, Opt_noresilient, - Opt_domainauto, Opt_rdma, Opt_modesid, + Opt_domainauto, Opt_rdma, Opt_modesid, Opt_rootfs, Opt_compress, /* Mount options which take numeric value */ @@ -266,6 +266,7 @@ static const match_table_t cifs_mount_option_tokens = { { Opt_ignore, "nomand" }, { Opt_ignore, "relatime" }, { Opt_ignore, "_netdev" }, + { Opt_rootfs, "rootfs" }, { Opt_err, NULL } }; @@ -1777,6 +1778,11 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, case Opt_nodfs: vol->nodfs = 1; break; + case Opt_rootfs: +#ifdef CONFIG_CIFS_ROOT + vol->rootfs = true; +#endif + break; case Opt_posixpaths: vol->posix_paths = 1; break; @@ -2727,7 +2733,8 @@ cifs_get_tcp_session(struct smb_vol *volume_info) goto out_err_crypto_release; } - tcp_ses->noblocksnd = volume_info->noblocksnd; + tcp_ses->noblockcnt = volume_info->rootfs; + tcp_ses->noblocksnd = volume_info->noblocksnd || volume_info->rootfs; tcp_ses->noautotune = volume_info->noautotune; tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay; tcp_ses->rdma = volume_info->rdma; @@ -3873,7 +3880,11 @@ generic_ip_connect(struct TCP_Server_Info *server) socket->sk->sk_sndbuf, socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); - rc = socket->ops->connect(socket, saddr, slen, 0); + rc = socket->ops->connect(socket, saddr, slen, + server->noblockcnt ? O_NONBLOCK : 0); + + if (rc == -EINPROGRESS) + rc = 0; if (rc < 0) { cifs_dbg(FYI, "Error %d connecting to server\n", rc); sock_release(socket); |