projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 147b31cf EVH |
1 | /* |
| 2 | * linux/fs/9p/vfs_addr.c | |
| 3 | * | |
| 4 | * This file contians vfs address (mmap) ops for 9P2000. | |
| 5 | * | |
| 6 | * Copyright (C) 2005 by Eric Van Hensbergen <[email protected]> | |
| 7 | * Copyright (C) 2002 by Ron Minnich <[email protected]> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or modify | |
| 10 | * it under the terms of the GNU General Public License as published by | |
| 11 | * the Free Software Foundation; either version 2 of the License, or | |
| 12 | * (at your option) any later version. | |
| 13 | * | |
| 14 | * This program is distributed in the hope that it will be useful, | |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 | * GNU General Public License for more details. | |
| 18 | * | |
| 19 | * You should have received a copy of the GNU General Public License | |
| 20 | * along with this program; if not, write to: | |
| 21 | * Free Software Foundation | |
| 22 | * 51 Franklin Street, Fifth Floor | |
| 23 | * Boston, MA 02111-1301 USA | |
| 24 | * | |
| 25 | */ | |
| 26 | ||
| 27 | #include <linux/module.h> | |
| 28 | #include <linux/errno.h> | |
| 29 | #include <linux/fs.h> | |
| 30 | #include <linux/file.h> | |
| 31 | #include <linux/stat.h> | |
| 32 | #include <linux/string.h> | |
| 33 | #include <linux/smp_lock.h> | |
| 34 | #include <linux/inet.h> | |
| 35 | #include <linux/version.h> | |
| 36 | #include <linux/pagemap.h> | |
| 37 | #include <linux/idr.h> | |
| 38 | ||
| 39 | #include "debug.h" | |
| 40 | #include "v9fs.h" | |
| 41 | #include "9p.h" | |
| 42 | #include "v9fs_vfs.h" | |
| 43 | #include "fid.h" | |
| 44 | ||
| 45 | /** | |
| 46 | * v9fs_vfs_readpage - read an entire page in from 9P | |
| 47 | * | |
| 48 | * @file: file being read | |
| 49 | * @page: structure to page | |
| 50 | * | |
| 51 | */ | |
| 52 | ||
| 53 | static int v9fs_vfs_readpage(struct file *filp, struct page *page) | |
| 54 | { | |
| 55 | char *buffer = NULL; | |
| 56 | int retval = -EIO; | |
| 57 | loff_t offset = page_offset(page); | |
| 58 | int count = PAGE_CACHE_SIZE; | |
| 59 | struct inode *inode = filp->f_dentry->d_inode; | |
| 60 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
| 61 | int rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
| 62 | struct v9fs_fid *v9f = filp->private_data; | |
| 63 | struct v9fs_fcall *fcall = NULL; | |
| 64 | int fid = v9f->fid; | |
| 65 | int total = 0; | |
| 66 | int result = 0; | |
| 67 | ||
| 68 | buffer = kmap(page); | |
| 69 | do { | |
| 70 | if (count < rsize) | |
| 71 | rsize = count; | |
| 72 | ||
| 73 | result = v9fs_t_read(v9ses, fid, offset, rsize, &fcall); | |
| 74 | ||
| 75 | if (result < 0) { | |
| 76 | printk(KERN_ERR "v9fs_t_read returned %d\n", | |
| 77 | result); | |
| 78 | ||
| 79 | kfree(fcall); | |
| 80 | goto UnmapAndUnlock; | |
| 81 | } else | |
| 82 | offset += result; | |
| 83 | ||
| 84 | memcpy(buffer, fcall->params.rread.data, result); | |
| 85 | ||
| 86 | count -= result; | |
| 87 | buffer += result; | |
| 88 | total += result; | |
| 89 | ||
| 90 | kfree(fcall); | |
| 91 | ||
| 92 | if (result < rsize) | |
| 93 | break; | |
| 94 | } while (count); | |
| 95 | ||
| 96 | memset(buffer, 0, count); | |
| 97 | flush_dcache_page(page); | |
| 98 | SetPageUptodate(page); | |
| 99 | retval = 0; | |
| 100 | ||
| 101 | UnmapAndUnlock: | |
| 102 | kunmap(page); | |
| 103 | unlock_page(page); | |
| 104 | return retval; | |
| 105 | } | |
| 106 | ||
| 107 | struct address_space_operations v9fs_addr_operations = { | |
| 108 | .readpage = v9fs_vfs_readpage, | |
| 109 | }; |