#include <linux/statfs.h>
#include <linux/random.h>
#include <linux/sched.h>
+#include <linux/exportfs.h>
MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
fi->nodeid = 0;
fi->nlookup = 0;
fi->attr_version = 0;
+ fi->writectr = 0;
INIT_LIST_HEAD(&fi->write_files);
+ INIT_LIST_HEAD(&fi->queued_writes);
+ INIT_LIST_HEAD(&fi->writepages);
+ init_waitqueue_head(&fi->page_waitq);
fi->forget_req = fuse_request_alloc();
if (!fi->forget_req) {
kmem_cache_free(fuse_inode_cachep, inode);
{
struct fuse_inode *fi = get_fuse_inode(inode);
BUG_ON(!list_empty(&fi->write_files));
+ BUG_ON(!list_empty(&fi->queued_writes));
if (fi->forget_req)
fuse_request_free(fi->forget_req);
kmem_cache_free(fuse_inode_cachep, inode);
}
void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
- unsigned long nodeid, u64 nlookup)
+ u64 nodeid, u64 nlookup)
{
struct fuse_forget_in *inarg = &req->misc.forget_in;
inarg->nlookup = nlookup;
return 0;
}
-static void fuse_truncate(struct address_space *mapping, loff_t offset)
+void fuse_truncate(struct address_space *mapping, loff_t offset)
{
/* See vmtruncate() */
unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
}
-
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
- u64 attr_valid, u64 attr_version)
+void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
+ u64 attr_valid)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
- loff_t oldsize;
- spin_lock(&fc->lock);
- if (attr_version != 0 && fi->attr_version > attr_version) {
- spin_unlock(&fc->lock);
- return;
- }
fi->attr_version = ++fc->attr_version;
fi->i_time = attr_valid;
fi->orig_i_mode = inode->i_mode;
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
inode->i_mode &= ~S_ISVTX;
+}
+
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ loff_t oldsize;
+
+ spin_lock(&fc->lock);
+ if (attr_version != 0 && fi->attr_version > attr_version) {
+ spin_unlock(&fc->lock);
+ return;
+ }
+
+ fuse_change_attributes_common(inode, attr, attr_valid);
oldsize = inode->i_size;
i_size_write(inode, attr->size);
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
{
- unsigned long nodeid = *(unsigned long *) _nodeidp;
+ u64 nodeid = *(u64 *) _nodeidp;
if (get_node_id(inode) == nodeid)
return 1;
else
static int fuse_inode_set(struct inode *inode, void *_nodeidp)
{
- unsigned long nodeid = *(unsigned long *) _nodeidp;
+ u64 nodeid = *(u64 *) _nodeidp;
get_fuse_inode(inode)->nodeid = nodeid;
return 0;
}
-struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
+struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
int generation, struct fuse_attr *attr,
u64 attr_valid, u64 attr_version)
{
return inode;
}
-static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
+static void fuse_umount_begin(struct super_block *sb)
{
- if (flags & MNT_FORCE)
- fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
+ fuse_abort_conn(get_fuse_conn_super(sb));
}
static void fuse_send_destroy(struct fuse_conn *fc)
return 0;
}
-static struct fuse_conn *new_conn(void)
+static struct fuse_conn *new_conn(struct super_block *sb)
{
struct fuse_conn *fc;
int err;
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;
+ /* fuse does it's own writeback accounting */
+ fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
+ fc->dev = sb->s_dev;
err = bdi_init(&fc->bdi);
- if (err) {
- kfree(fc);
- fc = NULL;
- goto out;
+ if (err)
+ goto error_kfree;
+ if (sb->s_bdev) {
+ err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
+ MAJOR(fc->dev), MINOR(fc->dev));
+ } else {
+ err = bdi_register_dev(&fc->bdi, fc->dev);
}
+ if (err)
+ goto error_bdi_destroy;
+ /*
+ * For a single fuse filesystem use max 1% of dirty +
+ * writeback threshold.
+ *
+ * This gives about 1M of write buffer for memory maps on a
+ * machine with 1G and 10% dirty_ratio, which should be more
+ * than enough.
+ *
+ * Privileged users can raise it by writing to
+ *
+ * /sys/class/bdi/<bdi>/max_ratio
+ */
+ bdi_set_max_ratio(&fc->bdi, 1);
fc->reqctr = 0;
fc->blocked = 1;
fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
}
-out:
return fc;
+
+error_bdi_destroy:
+ bdi_destroy(&fc->bdi);
+error_kfree:
+ mutex_destroy(&fc->inst_mutex);
+ kfree(fc);
+ return NULL;
}
void fuse_conn_put(struct fuse_conn *fc)
return fuse_iget(sb, 1, 0, &attr, 0, 0);
}
+struct fuse_inode_handle
+{
+ u64 nodeid;
+ u32 generation;
+};
+
+static struct dentry *fuse_get_dentry(struct super_block *sb,
+ struct fuse_inode_handle *handle)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct inode *inode;
+ struct dentry *entry;
+ int err = -ESTALE;
+
+ if (handle->nodeid == 0)
+ goto out_err;
+
+ inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
+ if (!inode) {
+ struct fuse_entry_out outarg;
+ struct qstr name;
+
+ if (!fc->export_support)
+ goto out_err;
+
+ name.len = 1;
+ name.name = ".";
+ err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
+ &inode);
+ if (err && err != -ENOENT)
+ goto out_err;
+ if (err || !inode) {
+ err = -ESTALE;
+ goto out_err;
+ }
+ err = -EIO;
+ if (get_node_id(inode) != handle->nodeid)
+ goto out_iput;
+ }
+ err = -ESTALE;
+ if (inode->i_generation != handle->generation)
+ goto out_iput;
+
+ entry = d_alloc_anon(inode);
+ err = -ENOMEM;
+ if (!entry)
+ goto out_iput;
+
+ if (get_node_id(inode) != FUSE_ROOT_ID) {
+ entry->d_op = &fuse_dentry_operations;
+ fuse_invalidate_entry_cache(entry);
+ }
+
+ return entry;
+
+ out_iput:
+ iput(inode);
+ out_err:
+ return ERR_PTR(err);
+}
+
+static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
+ int connectable)
+{
+ struct inode *inode = dentry->d_inode;
+ bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
+ int len = encode_parent ? 6 : 3;
+ u64 nodeid;
+ u32 generation;
+
+ if (*max_len < len)
+ return 255;
+
+ nodeid = get_fuse_inode(inode)->nodeid;
+ generation = inode->i_generation;
+
+ fh[0] = (u32)(nodeid >> 32);
+ fh[1] = (u32)(nodeid & 0xffffffff);
+ fh[2] = generation;
+
+ if (encode_parent) {
+ struct inode *parent;
+
+ spin_lock(&dentry->d_lock);
+ parent = dentry->d_parent->d_inode;
+ nodeid = get_fuse_inode(parent)->nodeid;
+ generation = parent->i_generation;
+ spin_unlock(&dentry->d_lock);
+
+ fh[3] = (u32)(nodeid >> 32);
+ fh[4] = (u32)(nodeid & 0xffffffff);
+ fh[5] = generation;
+ }
+
+ *max_len = len;
+ return encode_parent ? 0x82 : 0x81;
+}
+
+static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct fuse_inode_handle handle;
+
+ if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
+ return NULL;
+
+ handle.nodeid = (u64) fid->raw[0] << 32;
+ handle.nodeid |= (u64) fid->raw[1];
+ handle.generation = fid->raw[2];
+ return fuse_get_dentry(sb, &handle);
+}
+
+static struct dentry *fuse_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ struct fuse_inode_handle parent;
+
+ if (fh_type != 0x82 || fh_len < 6)
+ return NULL;
+
+ parent.nodeid = (u64) fid->raw[3] << 32;
+ parent.nodeid |= (u64) fid->raw[4];
+ parent.generation = fid->raw[5];
+ return fuse_get_dentry(sb, &parent);
+}
+
+static struct dentry *fuse_get_parent(struct dentry *child)
+{
+ struct inode *child_inode = child->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(child_inode);
+ struct inode *inode;
+ struct dentry *parent;
+ struct fuse_entry_out outarg;
+ struct qstr name;
+ int err;
+
+ if (!fc->export_support)
+ return ERR_PTR(-ESTALE);
+
+ name.len = 2;
+ name.name = "..";
+ err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
+ &name, &outarg, &inode);
+ if (err && err != -ENOENT)
+ return ERR_PTR(err);
+ if (err || !inode)
+ return ERR_PTR(-ESTALE);
+
+ parent = d_alloc_anon(inode);
+ if (!parent) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
+ if (get_node_id(inode) != FUSE_ROOT_ID) {
+ parent->d_op = &fuse_dentry_operations;
+ fuse_invalidate_entry_cache(parent);
+ }
+
+ return parent;
+}
+
+static const struct export_operations fuse_export_operations = {
+ .fh_to_dentry = fuse_fh_to_dentry,
+ .fh_to_parent = fuse_fh_to_parent,
+ .encode_fh = fuse_encode_fh,
+ .get_parent = fuse_get_parent,
+};
+
static const struct super_operations fuse_super_operations = {
.alloc_inode = fuse_alloc_inode,
.destroy_inode = fuse_destroy_inode,
fc->no_lock = 1;
if (arg->flags & FUSE_ATOMIC_O_TRUNC)
fc->atomic_o_trunc = 1;
+ if (arg->minor >= 9) {
+ /* LOOKUP has dependency on proto version */
+ if (arg->flags & FUSE_EXPORT_SUPPORT)
+ fc->export_support = 1;
+ }
+ if (arg->flags & FUSE_BIG_WRITES)
+ fc->big_writes = 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->max_write = max_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
fuse_put_request(fc, req);
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 | FUSE_ATOMIC_O_TRUNC;
+ arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
+ FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
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;
sb->s_magic = FUSE_SUPER_MAGIC;
sb->s_op = &fuse_super_operations;
sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_export_op = &fuse_export_operations;
file = fget(d.fd);
if (!file)
if (file->f_op != &fuse_dev_operations)
return -EINVAL;
- fc = new_conn();
+ fc = new_conn(sb);
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;
+ fc->max_read = max_t(unsigned, 4096, d.max_read);
/* Used by get_root_inode() */
sb->s_fs_info = fc;
if (file->private_data)
goto err_unlock;
- fc->id = conn_id();
err = fuse_ctl_add_conn(fc);
if (err)
goto err_unlock;
}
#endif
-static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo)
+static void fuse_inode_init_once(void *foo)
{
struct inode * inode = foo;
projects / linux-2.6 / blobdiff