diff options
| -rw-r--r-- | fs/filesystems.c | 21 | ||||
| -rw-r--r-- | fs/fuse/inode.c | 2 | ||||
| -rw-r--r-- | fs/namespace.c | 4 | ||||
| -rw-r--r-- | fs/super.c | 27 | ||||
| -rw-r--r-- | include/linux/fs.h | 7 |
5 files changed, 55 insertions, 6 deletions
diff --git a/fs/filesystems.c b/fs/filesystems.c index 7a4f61a..f37f872 100644 --- a/fs/filesystems.c +++ b/fs/filesystems.c @@ -41,11 +41,12 @@ void put_filesystem(struct file_system_type *fs) module_put(fs->owner); } -static struct file_system_type **find_filesystem(const char *name) +static struct file_system_type **find_filesystem(const char *name, unsigned len) { struct file_system_type **p; for (p=&file_systems; *p; p=&(*p)->next) - if (strcmp((*p)->name,name) == 0) + if (strlen((*p)->name) == len && + strncmp((*p)->name, name, len) == 0) break; return p; } @@ -68,11 +69,12 @@ int register_filesystem(struct file_system_type * fs) int res = 0; struct file_system_type ** p; + BUG_ON(strchr(fs->name, '.')); if (fs->next) return -EBUSY; INIT_LIST_HEAD(&fs->fs_supers); write_lock(&file_systems_lock); - p = find_filesystem(fs->name); + p = find_filesystem(fs->name, strlen(fs->name)); if (*p) res = -EBUSY; else @@ -215,19 +217,26 @@ int get_filesystem_list(char * buf) struct file_system_type *get_fs_type(const char *name) { struct file_system_type *fs; + const char *dot = strchr(name, '.'); + unsigned len = dot ? dot - name : strlen(name); read_lock(&file_systems_lock); - fs = *(find_filesystem(name)); + fs = *(find_filesystem(name, len)); if (fs && !try_module_get(fs->owner)) fs = NULL; read_unlock(&file_systems_lock); - if (!fs && (request_module("%s", name) == 0)) { + if (!fs && (request_module("%.*s", len, name) == 0)) { read_lock(&file_systems_lock); - fs = *(find_filesystem(name)); + fs = *(find_filesystem(name, len)); if (fs && !try_module_get(fs->owner)) fs = NULL; read_unlock(&file_systems_lock); } + + if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) { + put_filesystem(fs); + fs = NULL; + } return fs; } diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index d8003be..1397018 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -636,6 +636,7 @@ static int fuse_get_sb(struct file_system_type *fs_type, static struct file_system_type fuse_fs_type = { .owner = THIS_MODULE, .name = "fuse", + .fs_flags = FS_HAS_SUBTYPE, .get_sb = fuse_get_sb, .kill_sb = kill_anon_super, }; @@ -652,6 +653,7 @@ static int fuse_get_sb_blk(struct file_system_type *fs_type, static struct file_system_type fuseblk_fs_type = { .owner = THIS_MODULE, .name = "fuseblk", + .fs_flags = FS_HAS_SUBTYPE, .get_sb = fuse_get_sb_blk, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, diff --git a/fs/namespace.c b/fs/namespace.c index be5e56b..c5b8810 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -377,6 +377,10 @@ static int show_vfsmnt(struct seq_file *m, void *v) seq_path(m, mnt, mnt->mnt_root, " \t\n\\"); seq_putc(m, ' '); mangle(m, mnt->mnt_sb->s_type->name); + if (mnt->mnt_sb->s_subtype && mnt->mnt_sb->s_subtype[0]) { + seq_putc(m, '.'); + mangle(m, mnt->mnt_sb->s_subtype); + } seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? " ro" : " rw"); for (fs_infop = fs_info; fs_infop->flag; fs_infop++) { if (mnt->mnt_sb->s_flags & fs_infop->flag) @@ -107,6 +107,7 @@ out: static inline void destroy_super(struct super_block *s) { security_sb_free(s); + kfree(s->s_subtype); kfree(s); } @@ -907,6 +908,29 @@ out: EXPORT_SYMBOL_GPL(vfs_kern_mount); +static struct vfsmount *fs_set_subtype(struct vfsmount *mnt, const char *fstype) +{ + int err; + const char *subtype = strchr(fstype, '.'); + if (subtype) { + subtype++; + err = -EINVAL; + if (!subtype[0]) + goto err; + } else + subtype = ""; + + mnt->mnt_sb->s_subtype = kstrdup(subtype, GFP_KERNEL); + err = -ENOMEM; + if (!mnt->mnt_sb->s_subtype) + goto err; + return mnt; + + err: + mntput(mnt); + return ERR_PTR(err); +} + struct vfsmount * do_kern_mount(const char *fstype, int flags, const char *name, void *data) { @@ -915,6 +939,9 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data) if (!type) return ERR_PTR(-ENODEV); mnt = vfs_kern_mount(type, flags, name, data); + if (!IS_ERR(mnt) && (type->fs_flags & FS_HAS_SUBTYPE) && + !mnt->mnt_sb->s_subtype) + mnt = fs_set_subtype(mnt, fstype); put_filesystem(type); return mnt; } diff --git a/include/linux/fs.h b/include/linux/fs.h index 986b5d5d..527a09a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -92,6 +92,7 @@ extern int dir_notify_enable; /* public flags for file_system_type */ #define FS_REQUIRES_DEV 1 #define FS_BINARY_MOUNTDATA 2 +#define FS_HAS_SUBTYPE 4 #define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */ #define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() * during rename() internally. @@ -961,6 +962,12 @@ struct super_block { /* Granularity of c/m/atime in ns. Cannot be worse than a second */ u32 s_time_gran; + + /* + * Filesystem subtype. If non-empty the filesystem type field + * in /proc/mounts will be "type.subtype" + */ + char *s_subtype; }; extern struct timespec current_fs_time(struct super_block *sb); |
