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fuse: add retrieve request

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Userspace filesystem can request data to be retrieved from the inode's
mapping.  This request is synchronous and the retrieved data is queued
as a new request.  If the write to the fuse device returns an error
then the retrieve request was not completed and a reply will not be
sent.

Only present pages are returned in the retrieve reply.  Retrieving
stops when it finds a non-present page and only data prior to that is
returned.

This request doesn't change the dirty state of pages.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi
2010-07-12 14:41:40 +02:00
parent a1d75f2582
commit 2d45ba381a
3 changed files with 152 additions and 1 deletions
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21
include/linux/fuse.h
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@ -40,6 +40,7 @@
*
* 7.15
* - add store notify
* - add retrieve notify
*/
#ifndef _LINUX_FUSE_H
@ -254,6 +255,7 @@ enum fuse_opcode {
FUSE_DESTROY = 38,
FUSE_IOCTL = 39,
FUSE_POLL = 40,
FUSE_NOTIFY_REPLY = 41,
/* CUSE specific operations */
CUSE_INIT = 4096,
@ -264,6 +266,7 @@ enum fuse_notify_code {
FUSE_NOTIFY_INVAL_INODE = 2,
FUSE_NOTIFY_INVAL_ENTRY = 3,
FUSE_NOTIFY_STORE = 4,
FUSE_NOTIFY_RETRIEVE = 5,
FUSE_NOTIFY_CODE_MAX,
};
@ -579,4 +582,22 @@ struct fuse_notify_store_out {
__u32 padding;
};
struct fuse_notify_retrieve_out {
__u64 notify_unique;
__u64 nodeid;
__u64 offset;
__u32 size;
__u32 padding;
};
/* Matches the size of fuse_write_in */
struct fuse_notify_retrieve_in {
__u64 dummy1;
__u64 offset;
__u32 size;
__u32 dummy2;
__u64 dummy3;
__u64 dummy4;
};
#endif /* _LINUX_FUSE_H */