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[PATCH] FUSE - device functions

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This adds the FUSE device handling functions.

This contains the following files:

 o dev.c
    - fuse device operations (read, write, release, poll)
    - registers misc device
    - support for sending requests to userspace

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi
2005-09-09 13:10:27 -07:00
committed by Linus Torvalds
parent d8a5ba4545
commit 334f485df8
6 changed files with 1537 additions and 7 deletions
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58
fs/fuse/inode.c
View File

@@ -151,6 +151,8 @@ static void fuse_put_super(struct super_block *sb)
mount_count --;
fc->sb = NULL;
fc->user_id = 0;
/* Flush all readers on this fs */
wake_up_all(&fc->waitq);
fuse_release_conn(fc);
*get_fuse_conn_super_p(sb) = NULL;
spin_unlock(&fuse_lock);
@@ -229,9 +231,22 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
return 0;
}
static void free_conn(struct fuse_conn *fc)
{
while (!list_empty(&fc->unused_list)) {
struct fuse_req *req;
req = list_entry(fc->unused_list.next, struct fuse_req, list);
list_del(&req->list);
fuse_request_free(req);
}
kfree(fc);
}
/* Must be called with the fuse lock held */
void fuse_release_conn(struct fuse_conn *fc)
{
kfree(fc);
if (!fc->sb && !fc->file)
free_conn(fc);
}
static struct fuse_conn *new_conn(void)
@@ -240,11 +255,27 @@ static struct fuse_conn *new_conn(void)
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
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);
sema_init(&fc->outstanding_sem, 0);
for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
struct fuse_req *req = fuse_request_alloc();
if (!req) {
free_conn(fc);
return NULL;
}
list_add(&req->list, &fc->unused_list);
}
fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
fc->bdi.unplug_io_fn = default_unplug_io_fn;
fc->reqctr = 0;
}
return fc;
}
@@ -253,11 +284,20 @@ static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
{
struct fuse_conn *fc;
if (file->f_op != &fuse_dev_operations)
return ERR_PTR(-EINVAL);
fc = new_conn();
if (fc == NULL)
return NULL;
return ERR_PTR(-ENOMEM);
spin_lock(&fuse_lock);
fc->sb = sb;
if (file->private_data) {
free_conn(fc);
fc = ERR_PTR(-EINVAL);
} else {
file->private_data = fc;
fc->sb = sb;
fc->file = file;
}
spin_unlock(&fuse_lock);
return fc;
}
@@ -315,8 +355,8 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc = get_conn(file, sb);
fput(file);
if (fc == NULL)
return -EINVAL;
if (IS_ERR(fc))
return PTR_ERR(fc);
fc->user_id = d.user_id;
@@ -336,6 +376,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
iput(root);
goto err;
}
fuse_send_init(fc);
return 0;
err:
@@ -411,8 +452,14 @@ static int __init fuse_init(void)
if (res)
goto err;
res = fuse_dev_init();
if (res)
goto err_fs_cleanup;
return 0;
err_fs_cleanup:
fuse_fs_cleanup();
err:
return res;
}
@@ -422,6 +469,7 @@ static void __exit fuse_exit(void)
printk(KERN_DEBUG "fuse exit\n");
fuse_fs_cleanup();
fuse_dev_cleanup();
}
module_init(fuse_init);