#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>
spinlock_t fuse_lock;
static kmem_cache_t *fuse_inode_cachep;
-static int mount_count;
-
-static int mount_max = 1000;
-module_param(mount_max, int, 0644);
-MODULE_PARM_DESC(mount_max, "Maximum number of FUSE mounts allowed, if -1 then unlimited (default: 1000)");
#define FUSE_SUPER_MAGIC 0x65735546
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 flags;
+ unsigned max_read;
};
static struct inode *fuse_alloc_inode(struct super_block *sb)
fi = get_fuse_inode(inode);
fi->i_time = jiffies - 1;
fi->nodeid = 0;
+ fi->nlookup = 0;
+ fi->forget_req = fuse_request_alloc();
+ if (!fi->forget_req) {
+ kmem_cache_free(fuse_inode_cachep, inode);
+ return NULL;
+ }
return inode;
}
static void fuse_destroy_inode(struct inode *inode)
{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ if (fi->forget_req)
+ fuse_request_free(fi->forget_req);
kmem_cache_free(fuse_inode_cachep, inode);
}
/* No op */
}
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+ unsigned long nodeid, u64 nlookup)
+{
+ 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);
+}
+
static void fuse_clear_inode(struct inode *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;
+ }
}
void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
inode->i_mode = attr->mode & S_IFMT;
i_size_write(inode, attr->size);
+ if (S_ISREG(inode->i_mode)) {
+ fuse_init_common(inode);
+ fuse_init_file_inode(inode);
+ } else if (S_ISDIR(inode->i_mode))
+ fuse_init_dir(inode);
+ else if (S_ISLNK(inode->i_mode))
+ fuse_init_symlink(inode);
+ else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+ S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+ 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);
+ }
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
}
struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
- int generation, struct fuse_attr *attr, int version)
+ int generation, struct fuse_attr *attr)
{
struct inode *inode;
+ struct fuse_inode *fi;
struct fuse_conn *fc = get_fuse_conn_super(sb);
int retried = 0;
return NULL;
if ((inode->i_state & I_NEW)) {
+ inode->i_flags |= S_NOATIME|S_NOCMTIME;
inode->i_generation = generation;
inode->i_data.backing_dev_info = &fc->bdi;
fuse_init_inode(inode, attr);
goto retry;
}
+ fi = get_fuse_inode(inode);
+ fi->nlookup ++;
fuse_change_attributes(inode, attr);
- inode->i_version = version;
return inode;
}
{
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);
- mount_count --;
- fc->sb = NULL;
+ fc->mounted = 0;
fc->user_id = 0;
+ fc->group_id = 0;
+ fc->flags = 0;
/* Flush all readers on this fs */
wake_up_all(&fc->waitq);
+ up_write(&fc->sbput_sem);
fuse_release_conn(fc);
- *get_fuse_conn_super_p(sb) = NULL;
spin_unlock(&fuse_lock);
}
+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_blocks = attr->blocks;
+ stbuf->f_bfree = attr->bfree;
+ stbuf->f_bavail = attr->bavail;
+ stbuf->f_files = attr->files;
+ stbuf->f_ffree = attr->ffree;
+ stbuf->f_namelen = attr->namelen;
+ /* fsid is left zero */
+}
+
+static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ 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->in.numargs = 0;
+ req->in.h.opcode = FUSE_STATFS;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ request_send(fc, req);
+ err = req->out.h.error;
+ if (!err)
+ convert_fuse_statfs(buf, &outarg.st);
+ fuse_put_request(fc, req);
+ return err;
+}
+
enum {
OPT_FD,
OPT_ROOTMODE,
OPT_USER_ID,
+ OPT_GROUP_ID,
OPT_DEFAULT_PERMISSIONS,
OPT_ALLOW_OTHER,
- OPT_ALLOW_ROOT,
- OPT_KERNEL_CACHE,
+ OPT_MAX_READ,
OPT_ERR
};
{OPT_FD, "fd=%u"},
{OPT_ROOTMODE, "rootmode=%o"},
{OPT_USER_ID, "user_id=%u"},
+ {OPT_GROUP_ID, "group_id=%u"},
{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
{OPT_ALLOW_OTHER, "allow_other"},
- {OPT_ALLOW_ROOT, "allow_root"},
- {OPT_KERNEL_CACHE, "kernel_cache"},
+ {OPT_MAX_READ, "max_read=%u"},
{OPT_ERR, NULL}
};
{
char *p;
memset(d, 0, sizeof(struct fuse_mount_data));
- d->fd = -1;
+ d->max_read = ~0;
while ((p = strsep(&opt, ",")) != NULL) {
int token;
if (match_int(&args[0], &value))
return 0;
d->fd = value;
+ d->fd_present = 1;
break;
case OPT_ROOTMODE:
if (match_octal(&args[0], &value))
return 0;
d->rootmode = value;
+ d->rootmode_present = 1;
break;
case OPT_USER_ID:
if (match_int(&args[0], &value))
return 0;
d->user_id = value;
+ d->user_id_present = 1;
+ break;
+
+ case OPT_GROUP_ID:
+ if (match_int(&args[0], &value))
+ return 0;
+ d->group_id = value;
+ d->group_id_present = 1;
+ break;
+
+ case OPT_DEFAULT_PERMISSIONS:
+ d->flags |= FUSE_DEFAULT_PERMISSIONS;
+ break;
+
+ case OPT_ALLOW_OTHER:
+ d->flags |= FUSE_ALLOW_OTHER;
+ break;
+
+ case OPT_MAX_READ:
+ if (match_int(&args[0], &value))
+ return 0;
+ d->max_read = value;
break;
default:
return 0;
}
}
- if (d->fd == -1)
+
+ if (!d->fd_present || !d->rootmode_present ||
+ !d->user_id_present || !d->group_id_present)
return 0;
return 1;
struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
seq_printf(m, ",user_id=%u", fc->user_id);
+ seq_printf(m, ",group_id=%u", fc->group_id);
+ if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
+ seq_puts(m, ",default_permissions");
+ if (fc->flags & FUSE_ALLOW_OTHER)
+ seq_puts(m, ",allow_other");
+ if (fc->max_read != ~0)
+ seq_printf(m, ",max_read=%u", fc->max_read);
return 0;
}
/* Must be called with the fuse lock held */
void fuse_release_conn(struct fuse_conn *fc)
{
- if (!fc->sb && !fc->file)
+ fc->count--;
+ if (!fc->count)
free_conn(fc);
}
if (fc != NULL) {
int i;
memset(fc, 0, sizeof(*fc));
- fc->sb = NULL;
- fc->file = NULL;
- fc->user_id = 0;
init_waitqueue_head(&fc->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) {
fc = ERR_PTR(-EINVAL);
} else {
file->private_data = fc;
- fc->sb = sb;
- fc->file = file;
+ *get_fuse_conn_super_p(sb) = fc;
+ fc->mounted = 1;
+ fc->connected = 1;
+ fc->count = 2;
}
spin_unlock(&fuse_lock);
return fc;
attr.mode = mode;
attr.ino = FUSE_ROOT_ID;
- return fuse_iget(sb, 1, 0, &attr, 0);
+ return fuse_iget(sb, 1, 0, &attr);
}
static struct super_operations fuse_super_operations = {
.read_inode = fuse_read_inode,
.clear_inode = fuse_clear_inode,
.put_super = fuse_put_super,
+ .statfs = fuse_statfs,
.show_options = fuse_show_options,
};
-static int inc_mount_count(void)
-{
- int success = 0;
- spin_lock(&fuse_lock);
- mount_count ++;
- if (mount_max == -1 || mount_count <= mount_max)
- success = 1;
- spin_unlock(&fuse_lock);
- return success;
-}
-
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
struct fuse_conn *fc;
if (IS_ERR(fc))
return PTR_ERR(fc);
+ fc->flags = d.flags;
fc->user_id = d.user_id;
-
- *get_fuse_conn_super_p(sb) = fc;
-
- err = -ENFILE;
- if (!inc_mount_count() && current->uid != 0)
- goto err;
+ 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;
err = -ENOMEM;
root = get_root_inode(sb, d.rootmode);
err:
spin_lock(&fuse_lock);
- mount_count --;
- fc->sb = NULL;
fuse_release_conn(fc);
spin_unlock(&fuse_lock);
- *get_fuse_conn_super_p(sb) = NULL;
return err;
}
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