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[Qemu-devel] Re: [V9fs-developer] [PATCH] virtio-9p: getattr server impl
From: |
Aneesh Kumar K. V |
Subject: |
[Qemu-devel] Re: [V9fs-developer] [PATCH] virtio-9p: getattr server implementation for 9P2000.L protocol. |
Date: |
Thu, 01 Jul 2010 11:01:15 +0530 |
User-agent: |
Notmuch/ (http://notmuchmail.org) Emacs/24.0.50.1 (i686-pc-linux-gnu) |
On Fri, 28 May 2010 16:08:43 +0530, Sripathi Kodi <address@hidden> wrote:
> From: M. Mohan Kumar <address@hidden>
>
> SYNOPSIS
>
> size[4] Tgetattr tag[2] fid[4]
>
> size[4] Rgetattr tag[2] lstat[n]
>
> DESCRIPTION
>
> The getattr transaction inquires about the file identified by fid.
> The reply will contain a machine-independent directory entry,
> laid out as follows:
>
> qid.type[1]
> the type of the file (directory, etc.), represented as a bit
> vector corresponding to the high 8 bits of the file's mode
> word.
>
> qid.vers[4]
> version number for given path
>
> qid.path[8]
> the file server's unique identification for the file
>
> st_mode[4]
> Permission and flags
>
> st_nlink[8]
> Number of hard links
>
> st_uid[4]
> User id of owner
>
> st_gid[4]
> Group ID of owner
>
> st_rdev[8]
> Device ID (if special file)
>
> st_size[8]
> Size, in bytes
>
> st_blksize[8]
> Block size for file system IO
>
> st_blocks[8]
> Number of file system blocks allocated
>
> st_atime_sec[8]
> Time of last access, seconds
>
> st_atime_nsec[8]
> Time of last access, nanoseconds
>
> st_mtime_sec[8]
> Time of last modification, seconds
>
> st_mtime_nsec[8]
> Time of last modification, nanoseconds
>
> st_ctime_sec[8]
> Time of last status change, seconds
>
> st_ctime_nsec[8]
> Time of last status change, nanoseconds
>
>
> This patch implements the client side of getattr implementation for 9P2000.L.
> It introduces a new structure p9_stat_dotl for getting Linux stat information
> along with QID. The data layout is similar to stat structure in Linux user
> space with the following major differences:
>
> inode (st_ino) is not part of data. Instead qid is.
>
> device (st_dev) is not part of data because this doesn't make sense on the
> client.
>
> All time variables are 64 bit wide on the wire. The kernel seems to use
> 32 bit variables for these variables. However, some of the architectures
> have used 64 bit variables and glibc exposes 64 bit variables to user
> space on some architectures. Hence to be on the safer side we have made
> these 64 bit in the protocol. Refer to the comments in
> include/asm-generic/stat.h
>
>
Can we just hold on this patch. There is a discussion to add
i_generation and inode create time to a variant of stat. So may be the
protocol bits need those
-aneesh
- [Qemu-devel] Re: [V9fs-developer] [PATCH] virtio-9p: getattr server implementation for 9P2000.L protocol.,
Aneesh Kumar K. V <=