diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index e891a4f421a6..0ef3deeb085f 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -89,6 +89,7 @@ extern void cifs_mid_q_entry_release(struct mid_q_entry *midEntry); extern void cifs_wake_up_task(struct mid_q_entry *mid); extern int cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid); +extern int smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx); extern bool cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs); extern int cifs_discard_remaining_data(struct TCP_Server_Info *server); extern int cifs_call_async(struct TCP_Server_Info *server, diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index ee40bce9c99f..8ae45367109c 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1258,61 +1258,6 @@ static int get_option_gid(substring_t args[], kgid_t *result) return 0; } -/* - * Parse a devname into substrings and populate the vol->UNC and vol->prepath - * fields with the result. Returns 0 on success and an error otherwise. - */ -static int -cifs_parse_devname(const char *devname, struct smb3_fs_context *ctx) -{ - char *pos; - const char *delims = "/\\"; - size_t len; - - if (unlikely(!devname || !*devname)) { - cifs_dbg(VFS, "Device name not specified\n"); - return -EINVAL; - } - - /* make sure we have a valid UNC double delimiter prefix */ - len = strspn(devname, delims); - if (len != 2) - return -EINVAL; - - /* find delimiter between host and sharename */ - pos = strpbrk(devname + 2, delims); - if (!pos) - return -EINVAL; - - /* skip past delimiter */ - ++pos; - - /* now go until next delimiter or end of string */ - len = strcspn(pos, delims); - - /* move "pos" up to delimiter or NULL */ - pos += len; - ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); - if (!ctx->UNC) - return -ENOMEM; - - convert_delimiter(ctx->UNC, '\\'); - - /* skip any delimiter */ - if (*pos == '/' || *pos == '\\') - pos++; - - /* If pos is NULL then no prepath */ - if (!*pos) - return 0; - - ctx->prepath = kstrdup(pos, GFP_KERNEL); - if (!ctx->prepath) - return -ENOMEM; - - return 0; -} - static int cifs_parse_mount_options(const char *mountdata, const char *devname, struct smb3_fs_context *ctx, bool is_smb3) @@ -1416,7 +1361,7 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, ctx->backupuid_specified = false; /* no backup intent for a user */ ctx->backupgid_specified = false; /* no backup intent for a group */ - switch (cifs_parse_devname(devname, ctx)) { + switch (smb3_parse_devname(devname, ctx)) { case 0: break; case -ENOMEM: @@ -4548,7 +4493,7 @@ static int check_dfs_prepath(struct cifs_sb_info *cifs_sb, struct smb3_fs_contex struct smb3_fs_context v = {NULL}; /* if @path contains a tree name, skip it in the prefix path */ if (added_treename) { - rc = cifs_parse_devname(path, &v); + rc = smb3_parse_devname(path, &v); if (rc) break; rc = -EREMOTE; diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c index af6ff0192d5e..84354cd4c960 100644 --- a/fs/cifs/fs_context.c +++ b/fs/cifs/fs_context.c @@ -260,3 +260,59 @@ smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx return rc; } + +/* + * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath + * fields with the result. Returns 0 on success and an error otherwise + * (e.g. ENOMEM or EINVAL) + */ +int +smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) +{ + char *pos; + const char *delims = "/\\"; + size_t len; + + if (unlikely(!devname || !*devname)) { + cifs_dbg(VFS, "Device name not specified\n"); + return -EINVAL; + } + + /* make sure we have a valid UNC double delimiter prefix */ + len = strspn(devname, delims); + if (len != 2) + return -EINVAL; + + /* find delimiter between host and sharename */ + pos = strpbrk(devname + 2, delims); + if (!pos) + return -EINVAL; + + /* skip past delimiter */ + ++pos; + + /* now go until next delimiter or end of string */ + len = strcspn(pos, delims); + + /* move "pos" up to delimiter or NULL */ + pos += len; + ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); + if (!ctx->UNC) + return -ENOMEM; + + convert_delimiter(ctx->UNC, '\\'); + + /* skip any delimiter */ + if (*pos == '/' || *pos == '\\') + pos++; + + /* If pos is NULL then no prepath */ + if (!*pos) + return 0; + + ctx->prepath = kstrdup(pos, GFP_KERNEL); + if (!ctx->prepath) + return -ENOMEM; + + return 0; +}