/*
FUSE: Filesystem in Userspace
- Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
+ Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/file.h>
-#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/statfs.h>
+#include <linux/random.h>
+#include <linux/sched.h>
MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
MODULE_LICENSE("GPL");
-spinlock_t fuse_lock;
-static kmem_cache_t *fuse_inode_cachep;
+static struct kmem_cache *fuse_inode_cachep;
+struct list_head fuse_conn_list;
+DEFINE_MUTEX(fuse_mutex);
#define FUSE_SUPER_MAGIC 0x65735546
unsigned group_id_present : 1;
unsigned flags;
unsigned max_read;
+ unsigned blksize;
};
static struct inode *fuse_alloc_inode(struct super_block *sb)
struct inode *inode;
struct fuse_inode *fi;
- inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
+ inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
if (!inode)
return NULL;
fi = get_fuse_inode(inode);
- fi->i_time = jiffies - 1;
+ fi->i_time = 0;
fi->nodeid = 0;
fi->nlookup = 0;
fi->forget_req = fuse_request_alloc();
}
}
+static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ if (*flags & MS_MANDLOCK)
+ return -EINVAL;
+
+ return 0;
+}
+
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
+ struct fuse_conn *fc = get_fuse_conn(inode);
if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
- invalidate_inode_pages(inode->i_mapping);
+ invalidate_mapping_pages(inode->i_mapping, 0, -1);
inode->i_ino = attr->ino;
inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
inode->i_nlink = attr->nlink;
inode->i_uid = attr->uid;
inode->i_gid = attr->gid;
+ spin_lock(&fc->lock);
i_size_write(inode, attr->size);
- inode->i_blksize = PAGE_CACHE_SIZE;
+ spin_unlock(&fc->lock);
inode->i_blocks = attr->blocks;
inode->i_atime.tv_sec = attr->atime;
inode->i_atime.tv_nsec = attr->atimensec;
static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
{
inode->i_mode = attr->mode & S_IFMT;
- i_size_write(inode, attr->size);
+ inode->i_size = attr->size;
if (S_ISREG(inode->i_mode)) {
fuse_init_common(inode);
fuse_init_file_inode(inode);
fuse_init_common(inode);
init_special_inode(inode, inode->i_mode,
new_decode_dev(attr->rdev));
- } else {
- /* Don't let user create weird files */
- inode->i_mode = S_IFREG;
- fuse_init_common(inode);
- fuse_init_file_inode(inode);
- }
+ } else
+ BUG();
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
struct inode *inode;
struct fuse_inode *fi;
struct fuse_conn *fc = get_fuse_conn_super(sb);
- int retried = 0;
retry:
inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
fuse_init_inode(inode, attr);
unlock_new_inode(inode);
} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
- BUG_ON(retried);
/* Inode has changed type, any I/O on the old should fail */
make_bad_inode(inode);
iput(inode);
- retried = 1;
goto retry;
}
fi = get_fuse_inode(inode);
+ spin_lock(&fc->lock);
fi->nlookup ++;
+ spin_unlock(&fc->lock);
fuse_change_attributes(inode, attr);
return inode;
}
+static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
+{
+ if (flags & MNT_FORCE)
+ fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
+}
+
+static void fuse_send_destroy(struct fuse_conn *fc)
+{
+ struct fuse_req *req = fc->destroy_req;
+ if (req && fc->conn_init) {
+ fc->destroy_req = NULL;
+ req->in.h.opcode = FUSE_DESTROY;
+ req->force = 1;
+ request_send(fc, req);
+ fuse_put_request(fc, req);
+ }
+}
+
static void fuse_put_super(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
- down_write(&fc->sbput_sem);
- while (!list_empty(&fc->background))
- fuse_release_background(list_entry(fc->background.next,
- struct fuse_req, bg_entry));
-
- spin_lock(&fuse_lock);
- fc->mounted = 0;
- fc->user_id = 0;
- fc->group_id = 0;
- fc->flags = 0;
+ fuse_send_destroy(fc);
+ spin_lock(&fc->lock);
+ fc->connected = 0;
+ fc->blocked = 0;
+ spin_unlock(&fc->lock);
/* Flush all readers on this fs */
+ kill_fasync(&fc->fasync, SIGIO, POLL_IN);
wake_up_all(&fc->waitq);
- up_write(&fc->sbput_sem);
- fuse_release_conn(fc);
- spin_unlock(&fuse_lock);
+ wake_up_all(&fc->blocked_waitq);
+ mutex_lock(&fuse_mutex);
+ list_del(&fc->entry);
+ fuse_ctl_remove_conn(fc);
+ mutex_unlock(&fuse_mutex);
+ fuse_conn_put(fc);
}
static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
{
stbuf->f_type = FUSE_SUPER_MAGIC;
stbuf->f_bsize = attr->bsize;
+ stbuf->f_frsize = attr->frsize;
stbuf->f_blocks = attr->blocks;
stbuf->f_bfree = attr->bfree;
stbuf->f_bavail = attr->bavail;
/* fsid is left zero */
}
-static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
{
+ struct super_block *sb = dentry->d_sb;
struct fuse_conn *fc = get_fuse_conn_super(sb);
struct fuse_req *req;
struct fuse_statfs_out outarg;
int err;
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+ memset(&outarg, 0, sizeof(outarg));
req->in.numargs = 0;
req->in.h.opcode = FUSE_STATFS;
+ req->in.h.nodeid = get_node_id(dentry->d_inode);
req->out.numargs = 1;
- req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].size =
+ fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
req->out.args[0].value = &outarg;
request_send(fc, req);
err = req->out.h.error;
OPT_DEFAULT_PERMISSIONS,
OPT_ALLOW_OTHER,
OPT_MAX_READ,
+ OPT_BLKSIZE,
OPT_ERR
};
{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
{OPT_ALLOW_OTHER, "allow_other"},
{OPT_MAX_READ, "max_read=%u"},
+ {OPT_BLKSIZE, "blksize=%u"},
{OPT_ERR, NULL}
};
-static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
+static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
{
char *p;
memset(d, 0, sizeof(struct fuse_mount_data));
d->max_read = ~0;
+ d->blksize = 512;
while ((p = strsep(&opt, ",")) != NULL) {
int token;
case OPT_ROOTMODE:
if (match_octal(&args[0], &value))
return 0;
+ if (!fuse_valid_type(value))
+ return 0;
d->rootmode = value;
d->rootmode_present = 1;
break;
d->max_read = value;
break;
+ case OPT_BLKSIZE:
+ if (!is_bdev || match_int(&args[0], &value))
+ return 0;
+ d->blksize = value;
+ break;
+
default:
return 0;
}
return 0;
}
-static void free_conn(struct fuse_conn *fc)
-{
- while (!list_empty(&fc->unused_list)) {
- struct fuse_req *req;
- req = list_entry(fc->unused_list.next, struct fuse_req, list);
- list_del(&req->list);
- fuse_request_free(req);
- }
- kfree(fc);
-}
-
-/* Must be called with the fuse lock held */
-void fuse_release_conn(struct fuse_conn *fc)
-{
- fc->count--;
- if (!fc->count)
- free_conn(fc);
-}
-
static struct fuse_conn *new_conn(void)
{
struct fuse_conn *fc;
- fc = kmalloc(sizeof(*fc), GFP_KERNEL);
- if (fc != NULL) {
- int i;
- memset(fc, 0, sizeof(*fc));
+ fc = kzalloc(sizeof(*fc), GFP_KERNEL);
+ if (fc) {
+ spin_lock_init(&fc->lock);
+ mutex_init(&fc->inst_mutex);
+ atomic_set(&fc->count, 1);
init_waitqueue_head(&fc->waitq);
+ init_waitqueue_head(&fc->blocked_waitq);
INIT_LIST_HEAD(&fc->pending);
INIT_LIST_HEAD(&fc->processing);
- INIT_LIST_HEAD(&fc->unused_list);
- INIT_LIST_HEAD(&fc->background);
- sema_init(&fc->outstanding_sem, 0);
- init_rwsem(&fc->sbput_sem);
- for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
- struct fuse_req *req = fuse_request_alloc();
- if (!req) {
- free_conn(fc);
- return NULL;
- }
- list_add(&req->list, &fc->unused_list);
- }
+ INIT_LIST_HEAD(&fc->io);
+ INIT_LIST_HEAD(&fc->interrupts);
+ atomic_set(&fc->num_waiting, 0);
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
fc->reqctr = 0;
+ fc->blocked = 1;
+ get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
}
return fc;
}
-static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
+void fuse_conn_put(struct fuse_conn *fc)
{
- struct fuse_conn *fc;
-
- if (file->f_op != &fuse_dev_operations)
- return ERR_PTR(-EINVAL);
- fc = new_conn();
- if (fc == NULL)
- return ERR_PTR(-ENOMEM);
- spin_lock(&fuse_lock);
- if (file->private_data) {
- free_conn(fc);
- fc = ERR_PTR(-EINVAL);
- } else {
- file->private_data = fc;
- *get_fuse_conn_super_p(sb) = fc;
- fc->mounted = 1;
- fc->connected = 1;
- fc->count = 2;
+ if (atomic_dec_and_test(&fc->count)) {
+ if (fc->destroy_req)
+ fuse_request_free(fc->destroy_req);
+ mutex_destroy(&fc->inst_mutex);
+ kfree(fc);
}
- spin_unlock(&fuse_lock);
+}
+
+struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
+{
+ atomic_inc(&fc->count);
return fc;
}
return fuse_iget(sb, 1, 0, &attr);
}
-static struct super_operations fuse_super_operations = {
+static const struct super_operations fuse_super_operations = {
.alloc_inode = fuse_alloc_inode,
.destroy_inode = fuse_destroy_inode,
.read_inode = fuse_read_inode,
.clear_inode = fuse_clear_inode,
+ .drop_inode = generic_delete_inode,
+ .remount_fs = fuse_remount_fs,
.put_super = fuse_put_super,
+ .umount_begin = fuse_umount_begin,
.statfs = fuse_statfs,
.show_options = fuse_show_options,
};
+static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
+{
+ struct fuse_init_out *arg = &req->misc.init_out;
+
+ if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
+ fc->conn_error = 1;
+ else {
+ unsigned long ra_pages;
+
+ if (arg->minor >= 6) {
+ ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
+ if (arg->flags & FUSE_ASYNC_READ)
+ fc->async_read = 1;
+ if (!(arg->flags & FUSE_POSIX_LOCKS))
+ fc->no_lock = 1;
+ } else {
+ ra_pages = fc->max_read / PAGE_CACHE_SIZE;
+ fc->no_lock = 1;
+ }
+
+ fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
+ fc->minor = arg->minor;
+ fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
+ fc->conn_init = 1;
+ }
+ fuse_put_request(fc, req);
+ fc->blocked = 0;
+ wake_up_all(&fc->blocked_waitq);
+}
+
+static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
+{
+ struct fuse_init_in *arg = &req->misc.init_in;
+
+ arg->major = FUSE_KERNEL_VERSION;
+ arg->minor = FUSE_KERNEL_MINOR_VERSION;
+ arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
+ arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
+ req->in.h.opcode = FUSE_INIT;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(*arg);
+ req->in.args[0].value = arg;
+ req->out.numargs = 1;
+ /* Variable length arguement used for backward compatibility
+ with interface version < 7.5. Rest of init_out is zeroed
+ by do_get_request(), so a short reply is not a problem */
+ req->out.argvar = 1;
+ req->out.args[0].size = sizeof(struct fuse_init_out);
+ req->out.args[0].value = &req->misc.init_out;
+ req->end = process_init_reply;
+ request_send_background(fc, req);
+}
+
+static u64 conn_id(void)
+{
+ static u64 ctr = 1;
+ return ctr++;
+}
+
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
struct fuse_conn *fc;
struct inode *root;
struct fuse_mount_data d;
struct file *file;
+ struct dentry *root_dentry;
+ struct fuse_req *init_req;
int err;
+ int is_bdev = sb->s_bdev != NULL;
+
+ if (sb->s_flags & MS_MANDLOCK)
+ return -EINVAL;
- if (!parse_fuse_opt((char *) data, &d))
+ if (!parse_fuse_opt((char *) data, &d, is_bdev))
return -EINVAL;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ if (is_bdev) {
+#ifdef CONFIG_BLOCK
+ if (!sb_set_blocksize(sb, d.blksize))
+ return -EINVAL;
+#endif
+ } else {
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ }
sb->s_magic = FUSE_SUPER_MAGIC;
sb->s_op = &fuse_super_operations;
sb->s_maxbytes = MAX_LFS_FILESIZE;
if (!file)
return -EINVAL;
- fc = get_conn(file, sb);
- fput(file);
- if (IS_ERR(fc))
- return PTR_ERR(fc);
+ if (file->f_op != &fuse_dev_operations)
+ return -EINVAL;
+
+ fc = new_conn();
+ if (!fc)
+ return -ENOMEM;
fc->flags = d.flags;
fc->user_id = d.user_id;
fc->group_id = d.group_id;
fc->max_read = d.max_read;
- if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
- fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
- fc->max_write = FUSE_MAX_IN / 2;
+
+ /* Used by get_root_inode() */
+ sb->s_fs_info = fc;
err = -ENOMEM;
root = get_root_inode(sb, d.rootmode);
- if (root == NULL)
+ if (!root)
goto err;
- sb->s_root = d_alloc_root(root);
- if (!sb->s_root) {
+ root_dentry = d_alloc_root(root);
+ if (!root_dentry) {
iput(root);
goto err;
}
- fuse_send_init(fc);
+
+ init_req = fuse_request_alloc();
+ if (!init_req)
+ goto err_put_root;
+
+ if (is_bdev) {
+ fc->destroy_req = fuse_request_alloc();
+ if (!fc->destroy_req)
+ goto err_put_root;
+ }
+
+ mutex_lock(&fuse_mutex);
+ err = -EINVAL;
+ if (file->private_data)
+ goto err_unlock;
+
+ fc->id = conn_id();
+ err = fuse_ctl_add_conn(fc);
+ if (err)
+ goto err_unlock;
+
+ list_add_tail(&fc->entry, &fuse_conn_list);
+ sb->s_root = root_dentry;
+ fc->connected = 1;
+ file->private_data = fuse_conn_get(fc);
+ mutex_unlock(&fuse_mutex);
+ /*
+ * atomic_dec_and_test() in fput() provides the necessary
+ * memory barrier for file->private_data to be visible on all
+ * CPUs after this
+ */
+ fput(file);
+
+ fuse_send_init(fc, init_req);
+
return 0;
+ err_unlock:
+ mutex_unlock(&fuse_mutex);
+ fuse_request_free(init_req);
+ err_put_root:
+ dput(root_dentry);
err:
- spin_lock(&fuse_lock);
- fuse_release_conn(fc);
- spin_unlock(&fuse_lock);
+ fput(file);
+ fuse_conn_put(fc);
return err;
}
-static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *raw_data)
+static int fuse_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name,
+ void *raw_data, struct vfsmount *mnt)
{
- return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
+ return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
}
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,
};
-static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
+#ifdef CONFIG_BLOCK
+static int fuse_get_sb_blk(struct file_system_type *fs_type,
+ int flags, const char *dev_name,
+ void *raw_data, struct vfsmount *mnt)
+{
+ return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
+ mnt);
+}
+
+static struct file_system_type fuseblk_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "fuseblk",
+ .get_sb = fuse_get_sb_blk,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
+};
+
+static inline int register_fuseblk(void)
+{
+ return register_filesystem(&fuseblk_fs_type);
+}
+
+static inline void unregister_fuseblk(void)
+{
+ unregister_filesystem(&fuseblk_fs_type);
+}
+#else
+static inline int register_fuseblk(void)
+{
+ return 0;
+}
+
+static inline void unregister_fuseblk(void)
+{
+}
+#endif
+
+static decl_subsys(fuse, NULL, NULL);
+static decl_subsys(connections, NULL, NULL);
+
+static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep,
unsigned long flags)
{
struct inode * inode = foo;
- if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
- SLAB_CTOR_CONSTRUCTOR)
- inode_init_once(inode);
+ inode_init_once(inode);
}
static int __init fuse_fs_init(void)
err = register_filesystem(&fuse_fs_type);
if (err)
- printk("fuse: failed to register filesystem\n");
- else {
- fuse_inode_cachep = kmem_cache_create("fuse_inode",
- sizeof(struct fuse_inode),
- 0, SLAB_HWCACHE_ALIGN,
- fuse_inode_init_once, NULL);
- if (!fuse_inode_cachep) {
- unregister_filesystem(&fuse_fs_type);
- err = -ENOMEM;
- }
- }
+ goto out;
+
+ err = register_fuseblk();
+ if (err)
+ goto out_unreg;
+
+ fuse_inode_cachep = kmem_cache_create("fuse_inode",
+ sizeof(struct fuse_inode),
+ 0, SLAB_HWCACHE_ALIGN,
+ fuse_inode_init_once);
+ err = -ENOMEM;
+ if (!fuse_inode_cachep)
+ goto out_unreg2;
+ return 0;
+
+ out_unreg2:
+ unregister_fuseblk();
+ out_unreg:
+ unregister_filesystem(&fuse_fs_type);
+ out:
return err;
}
static void fuse_fs_cleanup(void)
{
unregister_filesystem(&fuse_fs_type);
+ unregister_fuseblk();
kmem_cache_destroy(fuse_inode_cachep);
}
+static int fuse_sysfs_init(void)
+{
+ int err;
+
+ kobj_set_kset_s(&fuse_subsys, fs_subsys);
+ err = subsystem_register(&fuse_subsys);
+ if (err)
+ goto out_err;
+
+ kobj_set_kset_s(&connections_subsys, fuse_subsys);
+ err = subsystem_register(&connections_subsys);
+ if (err)
+ goto out_fuse_unregister;
+
+ return 0;
+
+ out_fuse_unregister:
+ subsystem_unregister(&fuse_subsys);
+ out_err:
+ return err;
+}
+
+static void fuse_sysfs_cleanup(void)
+{
+ subsystem_unregister(&connections_subsys);
+ subsystem_unregister(&fuse_subsys);
+}
+
static int __init fuse_init(void)
{
int res;
printk("fuse init (API version %i.%i)\n",
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
- spin_lock_init(&fuse_lock);
+ INIT_LIST_HEAD(&fuse_conn_list);
res = fuse_fs_init();
if (res)
goto err;
if (res)
goto err_fs_cleanup;
+ res = fuse_sysfs_init();
+ if (res)
+ goto err_dev_cleanup;
+
+ res = fuse_ctl_init();
+ if (res)
+ goto err_sysfs_cleanup;
+
return 0;
+ err_sysfs_cleanup:
+ fuse_sysfs_cleanup();
+ err_dev_cleanup:
+ fuse_dev_cleanup();
err_fs_cleanup:
fuse_fs_cleanup();
err:
{
printk(KERN_DEBUG "fuse exit\n");
+ fuse_ctl_cleanup();
+ fuse_sysfs_cleanup();
fuse_fs_cleanup();
fuse_dev_cleanup();
}