diff options
Diffstat (limited to 'kernel/inode.c')
| -rw-r--r-- | kernel/inode.c | 1101 |
1 files changed, 0 insertions, 1101 deletions
diff --git a/kernel/inode.c b/kernel/inode.c deleted file mode 100644 index 0a5900e..0000000 --- a/kernel/inode.c +++ /dev/null @@ -1,1101 +0,0 @@ -/* - FUSE: Filesystem in Userspace - Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> - - This program can be distributed under the terms of the GNU GPL. - See the file COPYING. -*/ - -#include "fuse_i.h" - -#include <linux/pagemap.h> -#include <linux/slab.h> -#include <linux/file.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"); -#ifdef MODULE_LICENSE -MODULE_LICENSE("GPL"); -#endif - -static struct kmem_cache *fuse_inode_cachep; -struct list_head fuse_conn_list; -DEFINE_MUTEX(fuse_mutex); - -#define FUSE_SUPER_MAGIC 0x65735546 - -#ifndef MAX_LFS_FILESIZE -#define MAX_LFS_FILESIZE (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) -#endif -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 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, GFP_KERNEL); - if (!inode) - return NULL; - - fi = get_fuse_inode(inode); - fi->i_time = 0; - 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); -#ifndef KERNEL_2_6_18_PLUS - if (inode->i_flock) { - WARN_ON(inode->i_flock->fl_next); - kfree(inode->i_flock); - inode->i_flock = NULL; - } -#endif - 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) -{ - 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; - } -} - -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) -#ifdef KERNEL_2_6_21_PLUS - invalidate_mapping_pages(inode->i_mapping, 0, -1); -#else - invalidate_inode_pages(inode->i_mapping); -#endif - - 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); - spin_unlock(&fc->lock); -#ifdef HAVE_I_BLKSIZE - inode->i_blksize = PAGE_CACHE_SIZE; -#endif - inode->i_blocks = attr->blocks; - inode->i_atime.tv_sec = attr->atime; - inode->i_atime.tv_nsec = attr->atimensec; - inode->i_mtime.tv_sec = attr->mtime; - inode->i_mtime.tv_nsec = attr->mtimensec; - inode->i_ctime.tv_sec = attr->ctime; - inode->i_ctime.tv_nsec = attr->ctimensec; -} - -static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) -{ - inode->i_mode = attr->mode & S_IFMT; - inode->i_size = 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 - BUG(); -} - -static int fuse_inode_eq(struct inode *inode, void *_nodeidp) -{ - unsigned long nodeid = *(unsigned long *) _nodeidp; - if (get_node_id(inode) == nodeid) - return 1; - else - return 0; -} - -static int fuse_inode_set(struct inode *inode, void *_nodeidp) -{ - unsigned long nodeid = *(unsigned long *) _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 *inode; - struct fuse_inode *fi; - struct fuse_conn *fc = get_fuse_conn_super(sb); - - retry: - inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid); - if (!inode) - 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); - unlock_new_inode(inode); - } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { - /* Inode has changed type, any I/O on the old should fail */ - make_bad_inode(inode); - iput(inode); - goto retry; - } - - fi = get_fuse_inode(inode); - spin_lock(&fc->lock); - fi->nlookup ++; - spin_unlock(&fc->lock); - fuse_change_attributes(inode, attr); - return inode; -} - -#ifdef UMOUNT_BEGIN_VFSMOUNT -static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags) -{ - if (flags & MNT_FORCE) - fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb)); -} -#else -static void fuse_umount_begin(struct super_block *sb) -{ - fuse_abort_conn(get_fuse_conn_super(sb)); -} -#endif - -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); - - 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); - wake_up_all(&fc->blocked_waitq); - wake_up_all(&fc->reserved_req_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; - stbuf->f_files = attr->files; - stbuf->f_ffree = attr->ffree; - stbuf->f_namelen = attr->namelen; - /* fsid is left zero */ -} - -#ifdef KERNEL_2_6_18_PLUS -static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) -#else -static int fuse_statfs(struct super_block *sb, struct kstatfs *buf) -#endif -{ -#ifdef KERNEL_2_6_18_PLUS - struct super_block *sb = dentry->d_sb; -#endif - struct fuse_conn *fc = get_fuse_conn_super(sb); - struct fuse_req *req; - 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); - - memset(&outarg, 0, sizeof(outarg)); - req->in.numargs = 0; - req->in.h.opcode = FUSE_STATFS; -#ifdef KERNEL_2_6_18_PLUS - req->in.h.nodeid = get_node_id(dentry->d_inode); -#endif - req->out.numargs = 1; - 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; - 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_MAX_READ, - OPT_BLKSIZE, - OPT_ERR -}; - -static match_table_t tokens = { - {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_MAX_READ, "max_read=%u"}, - {OPT_BLKSIZE, "blksize=%u"}, - {OPT_ERR, NULL} -}; - -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; - - /* - * For unprivileged mounts use current uid/gid. Still allow - * "user_id" and "group_id" options for compatibility, but - * only if they match these values. - */ - if (!capable(CAP_SYS_ADMIN)) { - d->user_id = current->uid; - d->user_id_present = 1; - d->group_id = current->gid; - d->group_id_present = 1; - - } - - while ((p = strsep(&opt, ",")) != NULL) { - int token; - int value; - substring_t args[MAX_OPT_ARGS]; - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - case OPT_FD: - 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; - if (!fuse_valid_type(value)) - return 0; - d->rootmode = value; - d->rootmode_present = 1; - break; - - case OPT_USER_ID: - if (match_int(&args[0], &value)) - return 0; - if (d->user_id_present && d->user_id != 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; - if (d->group_id_present && d->group_id != 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; - - case OPT_BLKSIZE: - if (!is_bdev || match_int(&args[0], &value)) - return 0; - d->blksize = value; - break; - - default: - return 0; - } - } - - if (!d->fd_present || !d->rootmode_present || - !d->user_id_present || !d->group_id_present) - return 0; - - return 1; -} - -static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) -{ - 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; -} - -#ifndef HAVE_KZALLOC -static void *kzalloc(size_t size, int flags) -{ - void *ret = kmalloc(size, flags); - if (ret) - memset(ret, 0, size); - return ret; -} -#endif -static struct fuse_conn *new_conn(void) -{ - struct fuse_conn *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_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; - fc->reqctr = 0; - fc->blocked = 1; - get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); - } - return fc; -} - -void fuse_conn_put(struct fuse_conn *fc) -{ - if (atomic_dec_and_test(&fc->count)) { - if (fc->destroy_req) - fuse_request_free(fc->destroy_req); - mutex_destroy(&fc->inst_mutex); - kfree(fc); - } -} - -struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) -{ - atomic_inc(&fc->count); - return fc; -} - -static struct inode *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); -} -#ifndef FUSE_MAINLINE -#ifdef HAVE_EXPORTFS_H -#include <linux/exportfs.h> -#endif - -struct fuse_inode_handle -{ - u64 nodeid; - u32 generation; -}; - -static struct dentry *fuse_get_dentry(struct super_block *sb, - struct fuse_inode_handle *handle) -{ - struct inode *inode; - struct dentry *entry; - - if (handle->nodeid == 0) - return ERR_PTR(-ESTALE); - - inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid); - if (!inode) - return ERR_PTR(-ESTALE); - if (inode->i_generation != handle->generation) { - iput(inode); - return ERR_PTR(-ESTALE); - } - - entry = d_alloc_anon(inode); - if (!entry) { - iput(inode); - return ERR_PTR(-ENOMEM); - } - entry->d_op = &fuse_dentry_operations; - - return entry; -} - -static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len, - int connectable) -{ - struct inode *inode = dentry->d_inode; - int len = *max_len; - int type = 1; - u64 nodeid; - u32 generation; - - if (len < 3 || (connectable && len < 6)) - return 255; - - nodeid = get_fuse_inode(inode)->nodeid; - generation = inode->i_generation; - - len = 3; - fh[0] = (u32)(nodeid >> 32); - fh[1] = (u32)(nodeid & 0xffffffff); - fh[2] = generation; - - if (connectable && !S_ISDIR(inode->i_mode)) { - struct inode *parent; - - spin_lock(&dentry->d_lock); - parent = dentry->d_parent->d_inode; - nodeid = get_fuse_inode(parent)->nodeid; - generation = parent->i_generation; - - fh[3] = (u32)(nodeid >> 32); - fh[4] = (u32)(nodeid & 0xffffffff); - fh[5] = generation; - spin_unlock(&dentry->d_lock); - - len = 6; - type = 2; - } - - *max_len = len; - return type; -} - -#ifdef KERNEL_2_6_24_PLUS -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_len < 3 || fh_type > 2) - 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 != 2 || 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 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, -}; -#else -static struct dentry *fuse_get_dentry_old(struct super_block *sb, void *objp) -{ - return fuse_get_dentry(sb, objp); -} - -static struct export_operations fuse_export_operations; - -static struct dentry *fuse_decode_fh(struct super_block *sb, u32 *fh, - int fh_len, int fileid_type, - int (*acceptable)(void *context, struct dentry *de), - void *context) -{ - struct fuse_inode_handle handle; - struct fuse_inode_handle parent; - - if (fh_len < 3 || fileid_type > 2) - return NULL; - - if (fileid_type == 2) { - if (fh_len < 6) - return NULL; - - parent.nodeid = (u64) fh[3] << 32; - parent.nodeid |= (u64) fh[4]; - parent.generation = fh[5]; - } else { - parent.nodeid = 0; - parent.generation = 0; - } - - handle.nodeid = (u64) fh[0] << 32; - handle.nodeid |= (u64) fh[1]; - handle.generation = fh[2]; - - return fuse_export_operations. - find_exported_dentry(sb, &handle, &parent, acceptable, context); -} - -static struct export_operations fuse_export_operations = { - .get_dentry = fuse_get_dentry_old, - .encode_fh = fuse_encode_fh, - .decode_fh = fuse_decode_fh, -}; -#endif -#endif - -static 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, is_bdev)) - return -EINVAL; - - /* This is a privileged option */ - if ((d.flags & FUSE_ALLOW_OTHER) && !capable(CAP_SYS_ADMIN)) - return -EPERM; - - 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; -#ifndef FUSE_MAINLINE - sb->s_export_op = &fuse_export_operations; -#endif - - file = fget(d.fd); - if (!file) - return -EINVAL; - - 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; - - /* 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; - } - - 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: - fput(file); - fuse_conn_put(fc); - return err; -} - -#ifdef KERNEL_2_6_18_PLUS -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, mnt); -} -#else -static struct super_block *fuse_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *raw_data) -{ - return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super); -} -#endif - -static struct file_system_type fuse_fs_type = { - .owner = THIS_MODULE, - .name = "fuse", - .get_sb = fuse_get_sb, - .kill_sb = kill_anon_super, - .fs_flags = FS_HAS_SUBTYPE | FS_SAFE, -}; - -#ifdef CONFIG_BLOCK -#ifdef KERNEL_2_6_18_PLUS -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); -} -#else -static struct super_block *fuse_get_sb_blk(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *raw_data) -{ - return get_sb_bdev(fs_type, flags, dev_name, raw_data, - fuse_fill_super); -} -#endif - -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 - -#ifndef HAVE_FS_SUBSYS -static decl_subsys(fs, NULL, NULL); -#endif -static decl_subsys(fuse, NULL, NULL); -static decl_subsys(connections, NULL, NULL); - -#ifdef KERNEL_2_6_24_PLUS -static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) -#else -static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep, - unsigned long flags) -#endif -{ - struct inode * inode = foo; - -#ifndef KERNEL_2_6_22_PLUS - if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == - SLAB_CTOR_CONSTRUCTOR) -#endif - inode_init_once(inode); -} - -static int __init fuse_fs_init(void) -{ - int err; - - err = register_filesystem(&fuse_fs_type); - if (err) - goto out; - - err = register_fuseblk(); - if (err) - goto out_unreg; - -#ifdef KERNEL_2_6_23_PLUS - fuse_inode_cachep = kmem_cache_create("fuse_inode", - sizeof(struct fuse_inode), - 0, SLAB_HWCACHE_ALIGN, - fuse_inode_init_once); -#else - fuse_inode_cachep = kmem_cache_create("fuse_inode", - sizeof(struct fuse_inode), - 0, SLAB_HWCACHE_ALIGN, - fuse_inode_init_once, NULL); -#endif - - 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; - -#ifndef HAVE_FS_SUBSYS - err = subsystem_register(&fs_subsys); - if (err) - return err; -#endif -#ifdef KERNEL_2_6_22_PLUS - kobj_set_kset_s(&fuse_subsys, fs_subsys); -#else - kset_set_kset_s(&fuse_subsys, fs_subsys); -#endif - err = subsystem_register(&fuse_subsys); - if (err) - goto out_err; - -#ifdef KERNEL_2_6_22_PLUS - kobj_set_kset_s(&connections_subsys, fuse_subsys); -#else - kset_set_kset_s(&connections_subsys, fuse_subsys); -#endif - err = subsystem_register(&connections_subsys); - if (err) - goto out_fuse_unregister; - - return 0; - - out_fuse_unregister: - subsystem_unregister(&fuse_subsys); - out_err: -#ifndef HAVE_FS_SUBSYS - subsystem_unregister(&fs_subsys); -#endif - return err; -} - -static void fuse_sysfs_cleanup(void) -{ - subsystem_unregister(&connections_subsys); - subsystem_unregister(&fuse_subsys); -#ifndef HAVE_FS_SUBSYS - subsystem_unregister(&fs_subsys); -#endif -} - -static int __init fuse_init(void) -{ - int res; - - printk("fuse init (API version %i.%i)\n", - FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); -#ifndef FUSE_MAINLINE - printk("fuse distribution version: %s\n", FUSE_VERSION); -#endif - - INIT_LIST_HEAD(&fuse_conn_list); - res = fuse_fs_init(); - if (res) - goto err; - - res = fuse_dev_init(); - 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: - return res; -} - -static void __exit fuse_exit(void) -{ - printk(KERN_DEBUG "fuse exit\n"); - - fuse_ctl_cleanup(); - fuse_sysfs_cleanup(); - fuse_fs_cleanup(); - fuse_dev_cleanup(); -} - -module_init(fuse_init); -module_exit(fuse_exit); |