X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Ffuse%2Finode.c;h=e5e80d1a46870dda75135efca29c793860164b15;hb=13f14b4d8be225cbb11ff2be7c048590a9ccf87b;hp=5448f625ab567730b89cf5dd7ac58e1939185e82;hpb=644b55ce889edd37d6406df26e2d96d7a7390749;p=linux-2.6 diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 5448f625ab..e5e80d1a46 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -56,6 +56,8 @@ static struct inode *fuse_alloc_inode(struct super_block *sb) fi->i_time = 0; fi->nodeid = 0; fi->nlookup = 0; + fi->attr_version = 0; + INIT_LIST_HEAD(&fi->write_files); fi->forget_req = fuse_request_alloc(); if (!fi->forget_req) { kmem_cache_free(fuse_inode_cachep, inode); @@ -68,6 +70,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb) static void fuse_destroy_inode(struct inode *inode) { struct fuse_inode *fi = get_fuse_inode(inode); + BUG_ON(!list_empty(&fi->write_files)); if (fi->forget_req) fuse_request_free(fi->forget_req); kmem_cache_free(fuse_inode_cachep, inode); @@ -109,20 +112,35 @@ static int fuse_remount_fs(struct super_block *sb, int *flags, char *data) return 0; } -void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) +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, + u64 attr_valid, u64 attr_version) { struct fuse_conn *fc = get_fuse_conn(inode); - if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size) - invalidate_mapping_pages(inode->i_mapping, 0, -1); + 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; inode->i_ino = attr->ino; - inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777); + 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); inode->i_blocks = attr->blocks; inode->i_atime.tv_sec = attr->atime; inode->i_atime.tv_nsec = attr->atimensec; @@ -130,6 +148,30 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr) inode->i_mtime.tv_nsec = attr->mtimensec; 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 + * check in may_delete(). + */ + fi->orig_i_mode = inode->i_mode; + if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS)) + inode->i_mode &= ~S_ISVTX; + + 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); + invalidate_inode_pages2(inode->i_mapping); + } } static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr) @@ -169,7 +211,8 @@ static int fuse_inode_set(struct inode *inode, void *_nodeidp) } struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, - int generation, struct fuse_attr *attr) + int generation, struct fuse_attr *attr, + u64 attr_valid, u64 attr_version) { struct inode *inode; struct fuse_inode *fi; @@ -197,7 +240,8 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid, spin_lock(&fc->lock); fi->nlookup ++; spin_unlock(&fc->lock); - fuse_change_attributes(inode, attr); + fuse_change_attributes(inode, attr, attr_valid, attr_version); + return inode; } @@ -232,6 +276,7 @@ static void fuse_put_super(struct super_block *sb) 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); @@ -261,6 +306,11 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf) 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); @@ -401,6 +451,7 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) static struct fuse_conn *new_conn(void) { struct fuse_conn *fc; + int err; fc = kzalloc(sizeof(*fc), GFP_KERNEL); if (fc) { @@ -409,6 +460,7 @@ static struct fuse_conn *new_conn(void) 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); @@ -416,10 +468,18 @@ static struct fuse_conn *new_conn(void) 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; + fc->attr_version = 1; get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); } +out: return fc; } @@ -429,6 +489,7 @@ 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); } } @@ -446,7 +507,8 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode) attr.mode = mode; attr.ino = FUSE_ROOT_ID; - return fuse_iget(sb, 1, 0, &attr); + attr.nlink = 1; + return fuse_iget(sb, 1, 0, &attr, 0, 0); } static const struct super_operations fuse_super_operations = { @@ -477,6 +539,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req) fc->async_read = 1; if (!(arg->flags & FUSE_POSIX_LOCKS)) fc->no_lock = 1; + if (arg->flags & FUSE_ATOMIC_O_TRUNC) + fc->atomic_o_trunc = 1; } else { ra_pages = fc->max_read / PAGE_CACHE_SIZE; fc->no_lock = 1; @@ -499,7 +563,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *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; + arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC; req->in.h.opcode = FUSE_INIT; req->in.numargs = 1; req->in.args[0].size = sizeof(*arg); @@ -680,11 +744,7 @@ 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) +static void fuse_inode_init_once(struct kmem_cache *cachep, void *foo) { struct inode * inode = foo; @@ -728,32 +788,37 @@ static void fuse_fs_cleanup(void) 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)