mm: bdi: expose the BDI object in sysfs for FUSE

[linux-2.6] / fs / fuse / inode.c

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 84f9f7dfdf5b6bc1162d57ff5bf4f3845e7d743a..c4fcfd59cd802ee4e4261d4991080fbf72dad49f 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -29,6 +29,8 @@ DEFINE_MUTEX(fuse_mutex);
 
 #define FUSE_SUPER_MAGIC 0x65735546
 
+#define FUSE_DEFAULT_BLKSIZE 512
+
 struct fuse_mount_data {
        int fd;
        unsigned rootmode;
@@ -76,11 +78,6 @@ static void fuse_destroy_inode(struct inode *inode)
        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)
 {
@@ -245,10 +242,9 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
        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)
@@ -360,7 +356,7 @@ 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;
+       d->blksize = FUSE_DEFAULT_BLKSIZE;
 
        while ((p = strsep(&opt, ",")) != NULL) {
                int token;
@@ -445,10 +441,13 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
                seq_puts(m, ",allow_other");
        if (fc->max_read != ~0)
                seq_printf(m, ",max_read=%u", fc->max_read);
+       if (mnt->mnt_sb->s_bdev &&
+           mnt->mnt_sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
+               seq_printf(m, ",blksize=%lu", mnt->mnt_sb->s_blocksize);
        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;
@@ -465,22 +464,30 @@ static struct fuse_conn *new_conn(void)
                INIT_LIST_HEAD(&fc->processing);
                INIT_LIST_HEAD(&fc->io);
                INIT_LIST_HEAD(&fc->interrupts);
+               INIT_LIST_HEAD(&fc->bg_queue);
                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->dev = sb->s_dev;
                err = bdi_init(&fc->bdi);
-               if (err) {
-                       kfree(fc);
-                       fc = NULL;
-                       goto out;
-               }
+               if (err)
+                       goto error_kfree;
+               err = bdi_register_dev(&fc->bdi, fc->dev);
+               if (err)
+                       goto error_bdi_destroy;
                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)
@@ -514,7 +521,6 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
 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,
        .drop_inode     = generic_delete_inode,
        .remount_fs     = fuse_remount_fs,
@@ -579,12 +585,6 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
        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;
@@ -622,7 +622,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
        if (file->f_op != &fuse_dev_operations)
                return -EINVAL;
 
-       fc = new_conn();
+       fc = new_conn(sb);
        if (!fc)
                return -ENOMEM;
 
@@ -660,7 +660,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
        if (file->private_data)
                goto err_unlock;
 
-       fc->id = conn_id();
        err = fuse_ctl_add_conn(fc);
        if (err)
                goto err_unlock;
@@ -744,9 +743,6 @@ 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(struct kmem_cache *cachep, void *foo)
 {
        struct inode * inode = foo;
@@ -791,32 +787,37 @@ 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)