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

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Register FUSE's backing_dev_info under sysfs with the name "fuse-MAJOR:MINOR"

Make the fuse control filesystem use s_dev instead of a fuse specific ID.
This makes it easier to match directories under /sys/fs/fuse/connections/ with
directories under /sys/class/bdi, and with actual mounts.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2008-04-30 00:54:34 -07:00 committed by Linus Torvalds
parent fa799759f9
commit b6f2fcbcfc
3 changed files with 18 additions and 18 deletions
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2
fs/fuse/control.c
View file

@ -117,7 +117,7 @@ int fuse_ctl_add_conn(struct fuse_conn *fc)
parent = fuse_control_sb->s_root;
inc_nlink(parent->d_inode);
sprintf(name, "%llu", (unsigned long long) fc->id);
sprintf(name, "%u", fc->dev);
parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, 2,
&simple_dir_inode_operations,
&simple_dir_operations);

4
fs/fuse/fuse_i.h
View file

@ -390,8 +390,8 @@ struct fuse_conn {
/** Entry on the fuse_conn_list */
struct list_head entry;
/** Unique ID */
u64 id;
/** Device ID from super block */
dev_t dev;
/** Dentries in the control filesystem */
struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];

30
fs/fuse/inode.c
View file

@ -447,7 +447,7 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
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;
@ -468,19 +468,26 @@ 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;
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)
@ -578,12 +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;
@ -621,7 +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;
@ -659,7 +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;