/*
FUSE: Filesystem in Userspace
- Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
+ Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/parser.h>
#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");
struct list_head fuse_conn_list;
DEFINE_MUTEX(fuse_mutex);
+static int set_global_limit(const char *val, struct kernel_param *kp);
+
+unsigned max_user_bgreq;
+module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
+ &max_user_bgreq, 0644);
+__MODULE_PARM_TYPE(max_user_bgreq, "uint");
+MODULE_PARM_DESC(max_user_bgreq,
+ "Global limit for the maximum number of backgrounded requests an "
+ "unprivileged user can set");
+
+unsigned max_user_congthresh;
+module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
+ &max_user_congthresh, 0644);
+__MODULE_PARM_TYPE(max_user_congthresh, "uint");
+MODULE_PARM_DESC(max_user_congthresh,
+ "Global limit for the maximum congestion threshold an "
+ "unprivileged user can set");
+
#define FUSE_SUPER_MAGIC 0x65735546
+#define FUSE_DEFAULT_BLKSIZE 512
+
+/** Maximum number of outstanding background requests */
+#define FUSE_DEFAULT_MAX_BACKGROUND 12
+
+/** Congestion starts at 75% of maximum */
+#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
+
struct fuse_mount_data {
int fd;
unsigned rootmode;
unsigned user_id;
unsigned group_id;
- unsigned fd_present : 1;
- unsigned rootmode_present : 1;
- unsigned user_id_present : 1;
- unsigned group_id_present : 1;
+ unsigned fd_present:1;
+ unsigned rootmode_present:1;
+ unsigned user_id_present:1;
+ unsigned group_id_present:1;
unsigned flags;
unsigned max_read;
unsigned blksize;
};
+struct fuse_forget_link *fuse_alloc_forget(void)
+{
+ return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
+}
+
static struct inode *fuse_alloc_inode(struct super_block *sb)
{
struct inode *inode;
fi->i_time = 0;
fi->nodeid = 0;
fi->nlookup = 0;
- fi->forget_req = fuse_request_alloc();
- if (!fi->forget_req) {
+ 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 = fuse_alloc_forget();
+ if (!fi->forget) {
kmem_cache_free(fuse_inode_cachep, inode);
return NULL;
}
return inode;
}
-static void fuse_destroy_inode(struct inode *inode)
+static void fuse_i_callback(struct rcu_head *head)
{
- struct fuse_inode *fi = get_fuse_inode(inode);
- if (fi->forget_req)
- fuse_request_free(fi->forget_req);
+ struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(fuse_inode_cachep, inode);
}
-static void fuse_read_inode(struct inode *inode)
-{
- /* No op */
-}
-
-void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
- unsigned long nodeid, u64 nlookup)
+static void fuse_destroy_inode(struct inode *inode)
{
- struct fuse_forget_in *inarg = &req->misc.forget_in;
- inarg->nlookup = nlookup;
- req->in.h.opcode = FUSE_FORGET;
- req->in.h.nodeid = nodeid;
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(struct fuse_forget_in);
- req->in.args[0].value = inarg;
- request_send_noreply(fc, req);
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ BUG_ON(!list_empty(&fi->write_files));
+ BUG_ON(!list_empty(&fi->queued_writes));
+ kfree(fi->forget);
+ call_rcu(&inode->i_rcu, fuse_i_callback);
}
-static void fuse_clear_inode(struct inode *inode)
+static void fuse_evict_inode(struct inode *inode)
{
+ truncate_inode_pages(&inode->i_data, 0);
+ end_writeback(inode);
if (inode->i_sb->s_flags & MS_ACTIVE) {
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
- fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
- fi->forget_req = NULL;
+ fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
+ fi->forget = NULL;
}
}
return 0;
}
-static void fuse_truncate(struct address_space *mapping, loff_t offset)
-{
- /* See vmtruncate() */
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- truncate_inode_pages(mapping, offset);
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-}
-
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
+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;
+
+ fi->attr_version = ++fc->attr_version;
+ fi->i_time = attr_valid;
inode->i_ino = attr->ino;
inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
- inode->i_nlink = attr->nlink;
+ set_nlink(inode, attr->nlink);
inode->i_uid = attr->uid;
inode->i_gid = attr->gid;
inode->i_blocks = attr->blocks;
inode->i_ctime.tv_sec = attr->ctime;
inode->i_ctime.tv_nsec = attr->ctimensec;
+ if (attr->blksize != 0)
+ inode->i_blkbits = ilog2(attr->blksize);
+ else
+ inode->i_blkbits = inode->i_sb->s_blocksize_bits;
+
/*
* Don't set the sticky bit in i_mode, unless we want the VFS
* to check permissions. This prevents failures due to the
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);
spin_unlock(&fc->lock);
if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
- if (attr->size < oldsize)
- fuse_truncate(inode->i_mapping, attr->size);
+ truncate_pagecache(inode, oldsize, attr->size);
invalidate_inode_pages2(inode->i_mapping);
}
}
BUG();
}
-static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
+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,
- int generation, struct fuse_attr *attr)
+struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
+ int generation, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version)
{
struct inode *inode;
struct fuse_inode *fi;
fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
- fi->nlookup ++;
+ fi->nlookup++;
spin_unlock(&fc->lock);
- fuse_change_attributes(inode, attr);
+ fuse_change_attributes(inode, attr, attr_valid, attr_version);
+
return inode;
}
-static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
+int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
+ loff_t offset, loff_t len)
+{
+ struct inode *inode;
+ pgoff_t pg_start;
+ pgoff_t pg_end;
+
+ inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
+ if (!inode)
+ return -ENOENT;
+
+ fuse_invalidate_attr(inode);
+ if (offset >= 0) {
+ pg_start = offset >> PAGE_CACHE_SHIFT;
+ if (len <= 0)
+ pg_end = -1;
+ else
+ pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
+ invalidate_inode_pages2_range(inode->i_mapping,
+ pg_start, pg_end);
+ }
+ iput(inode);
+ return 0;
+}
+
+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)
fc->destroy_req = NULL;
req->in.h.opcode = FUSE_DESTROY;
req->force = 1;
- request_send(fc, req);
+ fuse_request_send(fc, req);
fuse_put_request(fc, req);
}
}
-static void fuse_put_super(struct super_block *sb)
+static void fuse_bdi_destroy(struct fuse_conn *fc)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ if (fc->bdi_initialized)
+ bdi_destroy(&fc->bdi);
+}
- fuse_send_destroy(fc);
+void fuse_conn_kill(struct fuse_conn *fc)
+{
spin_lock(&fc->lock);
fc->connected = 0;
fc->blocked = 0;
list_del(&fc->entry);
fuse_ctl_remove_conn(fc);
mutex_unlock(&fuse_mutex);
+ fuse_bdi_destroy(fc);
+}
+EXPORT_SYMBOL_GPL(fuse_conn_kill);
+
+static void fuse_put_super(struct super_block *sb)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+
+ fuse_send_destroy(fc);
+ fuse_conn_kill(fc);
fuse_conn_put(fc);
}
struct fuse_statfs_out outarg;
int err;
+ if (!fuse_allow_task(fc, current)) {
+ buf->f_type = FUSE_SUPER_MAGIC;
+ return 0;
+ }
+
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
req->out.args[0].size =
fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
req->out.args[0].value = &outarg;
- request_send(fc, req);
+ fuse_request_send(fc, req);
err = req->out.h.error;
if (!err)
convert_fuse_statfs(buf, &outarg.st);
OPT_ERR
};
-static match_table_t tokens = {
+static const match_table_t tokens = {
{OPT_FD, "fd=%u"},
{OPT_ROOTMODE, "rootmode=%o"},
{OPT_USER_ID, "user_id=%u"},
char *p;
memset(d, 0, sizeof(struct fuse_mount_data));
d->max_read = ~0;
- d->blksize = 512;
+ d->blksize = FUSE_DEFAULT_BLKSIZE;
while ((p = strsep(&opt, ",")) != NULL) {
int token;
return 1;
}
-static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
+static int fuse_show_options(struct seq_file *m, struct dentry *root)
{
- struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
+ struct super_block *sb = root->d_sb;
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
seq_printf(m, ",user_id=%u", fc->user_id);
seq_printf(m, ",group_id=%u", fc->group_id);
seq_puts(m, ",allow_other");
if (fc->max_read != ~0)
seq_printf(m, ",max_read=%u", fc->max_read);
+ if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
+ seq_printf(m, ",blksize=%lu", sb->s_blocksize);
return 0;
}
-static struct fuse_conn *new_conn(void)
+void fuse_conn_init(struct fuse_conn *fc)
{
- struct fuse_conn *fc;
- int err;
-
- 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_waitqueue_head(&fc->reserved_req_waitq);
- INIT_LIST_HEAD(&fc->pending);
- INIT_LIST_HEAD(&fc->processing);
- 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;
- err = bdi_init(&fc->bdi);
- if (err) {
- kfree(fc);
- fc = NULL;
- goto out;
- }
- fc->reqctr = 0;
- fc->blocked = 1;
- get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
- }
-out:
- return fc;
+ memset(fc, 0, sizeof(*fc));
+ spin_lock_init(&fc->lock);
+ mutex_init(&fc->inst_mutex);
+ init_rwsem(&fc->killsb);
+ atomic_set(&fc->count, 1);
+ init_waitqueue_head(&fc->waitq);
+ init_waitqueue_head(&fc->blocked_waitq);
+ init_waitqueue_head(&fc->reserved_req_waitq);
+ INIT_LIST_HEAD(&fc->pending);
+ INIT_LIST_HEAD(&fc->processing);
+ INIT_LIST_HEAD(&fc->io);
+ INIT_LIST_HEAD(&fc->interrupts);
+ INIT_LIST_HEAD(&fc->bg_queue);
+ INIT_LIST_HEAD(&fc->entry);
+ fc->forget_list_tail = &fc->forget_list_head;
+ atomic_set(&fc->num_waiting, 0);
+ fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
+ fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
+ fc->khctr = 0;
+ fc->polled_files = RB_ROOT;
+ fc->reqctr = 0;
+ fc->blocked = 1;
+ fc->attr_version = 1;
+ get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
}
+EXPORT_SYMBOL_GPL(fuse_conn_init);
void fuse_conn_put(struct fuse_conn *fc)
{
if (fc->destroy_req)
fuse_request_free(fc->destroy_req);
mutex_destroy(&fc->inst_mutex);
- bdi_destroy(&fc->bdi);
- kfree(fc);
+ fc->release(fc);
}
}
+EXPORT_SYMBOL_GPL(fuse_conn_put);
struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
{
atomic_inc(&fc->count);
return fc;
}
+EXPORT_SYMBOL_GPL(fuse_conn_get);
-static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
+static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
{
struct fuse_attr attr;
memset(&attr, 0, sizeof(attr));
attr.mode = mode;
attr.ino = FUSE_ROOT_ID;
attr.nlink = 1;
- return fuse_iget(sb, 1, 0, &attr);
+ 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_obtain_alias(inode);
+ if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
+ 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) {
+ *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) {
+ if (err == -ENOENT)
+ return ERR_PTR(-ESTALE);
+ return ERR_PTR(err);
+ }
+
+ parent = d_obtain_alias(inode);
+ if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
+ 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,
- .read_inode = fuse_read_inode,
- .clear_inode = fuse_clear_inode,
+ .evict_inode = fuse_evict_inode,
.drop_inode = generic_delete_inode,
.remount_fs = fuse_remount_fs,
.put_super = fuse_put_super,
.show_options = fuse_show_options,
};
+static void sanitize_global_limit(unsigned *limit)
+{
+ if (*limit == 0)
+ *limit = ((num_physpages << PAGE_SHIFT) >> 13) /
+ sizeof(struct fuse_req);
+
+ if (*limit >= 1 << 16)
+ *limit = (1 << 16) - 1;
+}
+
+static int set_global_limit(const char *val, struct kernel_param *kp)
+{
+ int rv;
+
+ rv = param_set_uint(val, kp);
+ if (rv)
+ return rv;
+
+ sanitize_global_limit((unsigned *)kp->arg);
+
+ return 0;
+}
+
+static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
+{
+ int cap_sys_admin = capable(CAP_SYS_ADMIN);
+
+ if (arg->minor < 13)
+ return;
+
+ sanitize_global_limit(&max_user_bgreq);
+ sanitize_global_limit(&max_user_congthresh);
+
+ if (arg->max_background) {
+ fc->max_background = arg->max_background;
+
+ if (!cap_sys_admin && fc->max_background > max_user_bgreq)
+ fc->max_background = max_user_bgreq;
+ }
+ if (arg->congestion_threshold) {
+ fc->congestion_threshold = arg->congestion_threshold;
+
+ if (!cap_sys_admin &&
+ fc->congestion_threshold > max_user_congthresh)
+ fc->congestion_threshold = max_user_congthresh;
+ }
+}
+
static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_init_out *arg = &req->misc.init_out;
else {
unsigned long ra_pages;
+ process_init_limits(fc, arg);
+
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;
+ if (arg->minor >= 17) {
+ if (!(arg->flags & FUSE_FLOCK_LOCKS))
+ fc->no_flock = 1;
+ } else {
+ if (!(arg->flags & FUSE_POSIX_LOCKS))
+ fc->no_flock = 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;
+ if (arg->flags & FUSE_DONT_MASK)
+ fc->dont_mask = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
+ fc->no_flock = 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);
fc->blocked = 0;
wake_up_all(&fc->blocked_waitq);
}
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;
+ arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
+ FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
+ FUSE_FLOCK_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
+ /* Variable length argument 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);
+ fuse_request_send_background(fc, req);
}
-static u64 conn_id(void)
+static void fuse_free_conn(struct fuse_conn *fc)
{
- static u64 ctr = 1;
- return ctr++;
+ kfree(fc);
+}
+
+static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
+{
+ int err;
+
+ fc->bdi.name = "fuse";
+ fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
+ /* fuse does it's own writeback accounting */
+ fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
+
+ err = bdi_init(&fc->bdi);
+ if (err)
+ return err;
+
+ fc->bdi_initialized = 1;
+
+ 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)
+ return err;
+
+ /*
+ * 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);
+
+ return 0;
}
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
int err;
int is_bdev = sb->s_bdev != NULL;
+ err = -EINVAL;
if (sb->s_flags & MS_MANDLOCK)
- return -EINVAL;
+ goto err;
+
+ sb->s_flags &= ~MS_NOSEC;
if (!parse_fuse_opt((char *) data, &d, is_bdev))
- return -EINVAL;
+ goto err;
if (is_bdev) {
#ifdef CONFIG_BLOCK
+ err = -EINVAL;
if (!sb_set_blocksize(sb, d.blksize))
- return -EINVAL;
+ goto err;
#endif
} else {
sb->s_blocksize = PAGE_CACHE_SIZE;
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);
+ err = -EINVAL;
if (!file)
- return -EINVAL;
+ goto err;
if (file->f_op != &fuse_dev_operations)
- return -EINVAL;
+ goto err_fput;
- fc = new_conn();
+ fc = kmalloc(sizeof(*fc), GFP_KERNEL);
+ err = -ENOMEM;
if (!fc)
- return -ENOMEM;
+ goto err_fput;
+
+ fuse_conn_init(fc);
+
+ fc->dev = sb->s_dev;
+ fc->sb = sb;
+ err = fuse_bdi_init(fc, sb);
+ if (err)
+ goto err_put_conn;
+
+ sb->s_bdi = &fc->bdi;
+ /* Handle umasking inside the fuse code */
+ if (sb->s_flags & MS_POSIXACL)
+ fc->dont_mask = 1;
+ sb->s_flags |= MS_POSIXACL;
+
+ fc->release = fuse_free_conn;
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;
err = -ENOMEM;
- root = get_root_inode(sb, d.rootmode);
- if (!root)
- goto err;
-
- root_dentry = d_alloc_root(root);
- if (!root_dentry) {
- iput(root);
- goto err;
- }
+ root = fuse_get_root_inode(sb, d.rootmode);
+ root_dentry = d_make_root(root);
+ if (!root_dentry)
+ goto err_put_conn;
+ /* only now - we want root dentry with NULL ->d_op */
+ sb->s_d_op = &fuse_dentry_operations;
init_req = fuse_request_alloc();
if (!init_req)
if (is_bdev) {
fc->destroy_req = fuse_request_alloc();
if (!fc->destroy_req)
- goto err_put_root;
+ goto err_free_init_req;
}
mutex_lock(&fuse_mutex);
if (file->private_data)
goto err_unlock;
- fc->id = conn_id();
err = fuse_ctl_add_conn(fc);
if (err)
goto err_unlock;
err_unlock:
mutex_unlock(&fuse_mutex);
+ err_free_init_req:
fuse_request_free(init_req);
err_put_root:
dput(root_dentry);
- err:
- fput(file);
+ err_put_conn:
+ fuse_bdi_destroy(fc);
fuse_conn_put(fc);
+ err_fput:
+ fput(file);
+ err:
return err;
}
-static int fuse_get_sb(struct file_system_type *fs_type,
+static struct dentry *fuse_mount(struct file_system_type *fs_type,
int flags, const char *dev_name,
- void *raw_data, struct vfsmount *mnt)
+ void *raw_data)
{
- return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
+ return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
+}
+
+static void fuse_kill_sb_anon(struct super_block *sb)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+
+ if (fc) {
+ down_write(&fc->killsb);
+ fc->sb = NULL;
+ up_write(&fc->killsb);
+ }
+
+ kill_anon_super(sb);
}
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,
+ .mount = fuse_mount,
+ .kill_sb = fuse_kill_sb_anon,
};
#ifdef CONFIG_BLOCK
-static int fuse_get_sb_blk(struct file_system_type *fs_type,
+static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
int flags, const char *dev_name,
- void *raw_data, struct vfsmount *mnt)
+ void *raw_data)
{
- return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
- mnt);
+ return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
+}
+
+static void fuse_kill_sb_blk(struct super_block *sb)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(sb);
+
+ if (fc) {
+ down_write(&fc->killsb);
+ fc->sb = NULL;
+ up_write(&fc->killsb);
+ }
+
+ kill_block_super(sb);
}
static struct file_system_type fuseblk_fs_type = {
.owner = THIS_MODULE,
.name = "fuseblk",
- .get_sb = fuse_get_sb_blk,
- .kill_sb = kill_block_super,
+ .mount = fuse_mount_blk,
+ .kill_sb = fuse_kill_sb_blk,
.fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
};
}
#endif
-static decl_subsys(fuse, NULL, NULL);
-static decl_subsys(connections, NULL, NULL);
-
-static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo)
+static void fuse_inode_init_once(void *foo)
{
- struct inode * inode = foo;
+ struct inode *inode = foo;
inode_init_once(inode);
}
{
int err;
- err = register_filesystem(&fuse_fs_type);
- if (err)
- 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;
+ goto out;
+
+ err = register_fuseblk();
+ if (err)
+ goto out2;
+
+ err = register_filesystem(&fuse_fs_type);
+ if (err)
+ goto out3;
return 0;
- out_unreg2:
+ out3:
unregister_fuseblk();
- out_unreg:
- unregister_filesystem(&fuse_fs_type);
+ out2:
+ kmem_cache_destroy(fuse_inode_cachep);
out:
return err;
}
kmem_cache_destroy(fuse_inode_cachep);
}
+static struct kobject *fuse_kobj;
+static struct kobject *connections_kobj;
+
static int fuse_sysfs_init(void)
{
int err;
- kobj_set_kset_s(&fuse_subsys, fs_subsys);
- err = subsystem_register(&fuse_subsys);
- if (err)
+ fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
+ if (!fuse_kobj) {
+ err = -ENOMEM;
goto out_err;
+ }
- kobj_set_kset_s(&connections_subsys, fuse_subsys);
- err = subsystem_register(&connections_subsys);
- if (err)
+ connections_kobj = kobject_create_and_add("connections", fuse_kobj);
+ if (!connections_kobj) {
+ err = -ENOMEM;
goto out_fuse_unregister;
+ }
return 0;
out_fuse_unregister:
- subsystem_unregister(&fuse_subsys);
+ kobject_put(fuse_kobj);
out_err:
return err;
}
static void fuse_sysfs_cleanup(void)
{
- subsystem_unregister(&connections_subsys);
- subsystem_unregister(&fuse_subsys);
+ kobject_put(connections_kobj);
+ kobject_put(fuse_kobj);
}
static int __init fuse_init(void)
{
int res;
- printk("fuse init (API version %i.%i)\n",
+ printk(KERN_INFO "fuse init (API version %i.%i)\n",
FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
INIT_LIST_HEAD(&fuse_conn_list);
if (res)
goto err_sysfs_cleanup;
+ sanitize_global_limit(&max_user_bgreq);
+ sanitize_global_limit(&max_user_congthresh);
+
return 0;
err_sysfs_cleanup:
Code Review / linux-2.6.git / blobdiff