| 1 |
1628 |
jcastillo |
/*
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| 2 |
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* linux/fs/affs/file.c
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| 3 |
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*
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| 4 |
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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| 5 |
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*
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| 6 |
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
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| 7 |
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*
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| 8 |
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* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
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| 9 |
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*
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| 10 |
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* (C) 1991 Linus Torvalds - minix filesystem
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| 11 |
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*
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* affs regular file handling primitives
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*/
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| 15 |
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#include <asm/segment.h>
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| 16 |
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#include <asm/system.h>
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#include <linux/sched.h>
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| 18 |
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#include <linux/affs_fs.h>
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| 19 |
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#include <linux/fcntl.h>
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| 20 |
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#include <linux/kernel.h>
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| 21 |
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#include <linux/errno.h>
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| 22 |
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#include <linux/stat.h>
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| 23 |
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#include <linux/locks.h>
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| 24 |
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#include <linux/dirent.h>
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| 25 |
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#include <linux/fs.h>
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| 26 |
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#include <linux/amigaffs.h>
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#include <linux/mm.h>
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| 28 |
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#include <linux/pagemap.h>
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| 30 |
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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| 33 |
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static int affs_file_read_ofs(struct inode *inode, struct file *filp, char *buf, int count);
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| 34 |
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static int affs_file_write(struct inode *inode, struct file *filp, const char *buf, int count);
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| 35 |
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static int affs_file_write_ofs(struct inode *inode, struct file *filp, const char *buf, int count);
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| 36 |
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static void affs_release_file(struct inode *inode, struct file *filp);
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static struct file_operations affs_file_operations = {
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NULL, /* lseek - default */
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| 40 |
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generic_file_read, /* read */
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| 41 |
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affs_file_write, /* write */
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| 42 |
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NULL, /* readdir - bad */
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| 43 |
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NULL, /* select - default */
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NULL, /* ioctl - default */
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generic_file_mmap, /* mmap */
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NULL, /* no special open is needed */
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| 47 |
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affs_release_file, /* release */
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file_fsync /* brute force, but works */
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};
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struct inode_operations affs_file_inode_operations = {
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&affs_file_operations, /* default file operations */
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NULL, /* create */
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| 54 |
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NULL, /* lookup */
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NULL, /* link */
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NULL, /* unlink */
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NULL, /* symlink */
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| 58 |
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NULL, /* mkdir */
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| 59 |
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NULL, /* rmdir */
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| 60 |
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NULL, /* mknod */
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| 61 |
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NULL, /* rename */
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| 62 |
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NULL, /* readlink */
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| 63 |
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NULL, /* follow_link */
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| 64 |
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generic_readpage, /* readpage */
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| 65 |
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NULL, /* writepage */
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| 66 |
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affs_bmap, /* bmap */
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| 67 |
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affs_truncate, /* truncate */
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NULL, /* permission */
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| 69 |
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NULL /* smap */
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| 70 |
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};
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static struct file_operations affs_file_operations_ofs = {
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NULL, /* lseek - default */
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affs_file_read_ofs, /* read */
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affs_file_write_ofs, /* write */
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NULL, /* readdir - bad */
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NULL, /* select - default */
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| 78 |
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NULL, /* ioctl - default */
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| 79 |
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NULL, /* mmap */
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| 80 |
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NULL, /* no special open is needed */
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| 81 |
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affs_release_file, /* release */
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| 82 |
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file_fsync /* brute force, but works */
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| 83 |
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};
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| 84 |
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| 85 |
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struct inode_operations affs_file_inode_operations_ofs = {
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&affs_file_operations_ofs, /* default file operations */
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| 87 |
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NULL, /* create */
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| 88 |
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NULL, /* lookup */
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| 89 |
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NULL, /* link */
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| 90 |
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NULL, /* unlink */
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| 91 |
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NULL, /* symlink */
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| 92 |
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NULL, /* mkdir */
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| 93 |
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NULL, /* rmdir */
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| 94 |
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NULL, /* mknod */
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| 95 |
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NULL, /* rename */
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| 96 |
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NULL, /* readlink */
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| 97 |
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NULL, /* follow_link */
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| 98 |
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NULL, /* readpage */
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| 99 |
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NULL, /* writepage */
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| 100 |
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NULL, /* bmap */
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| 101 |
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affs_truncate, /* truncate */
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| 102 |
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NULL, /* permission */
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| 103 |
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NULL /* smap */
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| 104 |
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};
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| 105 |
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| 106 |
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int
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| 107 |
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affs_bmap(struct inode *inode, int block)
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| 108 |
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{
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| 109 |
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struct buffer_head *bh;
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| 110 |
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int ext, key;
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| 111 |
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int ptype, stype;
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| 112 |
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| 113 |
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pr_debug("AFFS: bmap(%lu,%d)\n",inode->i_ino,block);
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| 114 |
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| 115 |
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if (block < 0) {
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| 116 |
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printk("affs_bmap: block < 0\n");
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| 117 |
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return 0;
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| 118 |
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}
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| 119 |
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| 120 |
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/* If this is a hard link, quietly exchange the inode with the original */
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| 121 |
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| 122 |
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key = inode->u.affs_i.i_original ? inode->u.affs_i.i_original : inode->i_ino;
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| 124 |
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ext = block / AFFS_I2HSIZE(inode);
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| 125 |
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if (ext) {
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if (ext > inode->u.affs_i.i_max_ext)
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ext = inode->u.affs_i.i_max_ext;
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| 128 |
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if (ext)
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| 129 |
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key = inode->u.affs_i.i_ext[ext - 1];
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| 130 |
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block -= ext * AFFS_I2HSIZE(inode);
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| 131 |
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}
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| 132 |
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| 133 |
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for (;;) {
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| 134 |
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bh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
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| 135 |
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if (!bh)
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| 136 |
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return 0;
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| 137 |
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if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&ptype,&stype) ||
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(ptype != T_SHORT && ptype != T_LIST) || stype != ST_FILE) {
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| 139 |
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affs_brelse(bh);
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| 140 |
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return 0;
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| 141 |
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}
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| 142 |
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if (block < AFFS_I2HSIZE(inode))
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| 143 |
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break;
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| 144 |
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block -= AFFS_I2HSIZE(inode);
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| 145 |
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key = htonl(FILE_END(bh->b_data,inode)->extension);
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| 146 |
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affs_brelse(bh);
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| 147 |
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if (ext < EXT_CACHE_SIZE - 1) {
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| 148 |
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inode->u.affs_i.i_ext[ext] = key;
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| 149 |
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inode->u.affs_i.i_max_ext = ++ext;
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| 150 |
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}
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| 151 |
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}
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| 152 |
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key = AFFS_GET_HASHENTRY(bh->b_data,(AFFS_I2HSIZE(inode) - 1) - block);
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affs_brelse(bh);
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| 154 |
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return key;
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| 155 |
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}
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| 156 |
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| 157 |
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struct buffer_head *
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| 158 |
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affs_getblock(struct inode *inode, int block)
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| 159 |
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{
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| 160 |
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struct buffer_head *bh;
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| 161 |
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struct buffer_head *ebh;
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| 162 |
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int key;
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| 163 |
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int ext;
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| 164 |
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int cnt, j, pt;
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| 165 |
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| 166 |
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pr_debug("AFFS: getblock(%lu,%d)\n",inode->i_ino,block);
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| 168 |
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if (block < 0)
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| 169 |
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return NULL;
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| 170 |
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key = inode->i_ino;
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| 171 |
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pt = T_SHORT;
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| 172 |
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| 173 |
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ext = block / AFFS_I2HSIZE(inode);
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| 174 |
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if (ext) {
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| 175 |
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if (ext > inode->u.affs_i.i_max_ext)
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| 176 |
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ext = inode->u.affs_i.i_max_ext;
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| 177 |
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if (ext) {
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| 178 |
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key = inode->u.affs_i.i_ext[ext - 1];
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| 179 |
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block -= ext * AFFS_I2HSIZE(inode);
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| 180 |
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pt = T_LIST;
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| 181 |
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}
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| 182 |
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}
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| 183 |
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| 184 |
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for (;;) {
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| 185 |
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bh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
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| 186 |
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if (!bh)
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| 187 |
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return NULL;
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| 188 |
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if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&cnt,&j) ||
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| 189 |
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cnt != pt || j != ST_FILE) {
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| 190 |
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printk("AFFS: getblock(): inode %d is not a valid %s\n",key,
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| 191 |
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pt == T_SHORT ? "file header" : "extension block");
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| 192 |
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affs_brelse(bh);
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| 193 |
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return NULL;
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| 194 |
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}
|
| 195 |
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j = htonl(((struct file_front *)bh->b_data)->block_count);
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| 196 |
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while (j < AFFS_I2HSIZE(inode) && j <= block) {
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| 197 |
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key = affs_new_data(inode);
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| 198 |
|
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if (!key)
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| 199 |
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break;
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| 200 |
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lock_super(inode->i_sb);
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| 201 |
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if (AFFS_BLOCK(bh->b_data,inode,j)) {
|
| 202 |
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unlock_super(inode->i_sb);
|
| 203 |
|
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printk("AFFS: getblock(): block already allocated\n");
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| 204 |
|
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affs_free_block(inode->i_sb,key);
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| 205 |
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j++;
|
| 206 |
|
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continue;
|
| 207 |
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}
|
| 208 |
|
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unlock_super(inode->i_sb);
|
| 209 |
|
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AFFS_BLOCK(bh->b_data,inode,j) = ntohl(key);
|
| 210 |
|
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j++;
|
| 211 |
|
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}
|
| 212 |
|
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if (pt == T_SHORT)
|
| 213 |
|
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((struct file_front *)bh->b_data)->first_data =
|
| 214 |
|
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AFFS_BLOCK(bh->b_data,inode,0);
|
| 215 |
|
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((struct file_front *)bh->b_data)->block_count = ntohl(j);
|
| 216 |
|
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affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 217 |
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mark_buffer_dirty(bh,1);
|
| 218 |
|
|
|
| 219 |
|
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if (block < j)
|
| 220 |
|
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break;
|
| 221 |
|
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if (j < AFFS_I2HSIZE(inode)) {
|
| 222 |
|
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affs_brelse(bh);
|
| 223 |
|
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return NULL;
|
| 224 |
|
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}
|
| 225 |
|
|
|
| 226 |
|
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block -= AFFS_I2HSIZE(inode);
|
| 227 |
|
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key = htonl(FILE_END(bh->b_data,inode)->extension);
|
| 228 |
|
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if (!key) {
|
| 229 |
|
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key = affs_new_header(inode);
|
| 230 |
|
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if (!key) {
|
| 231 |
|
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affs_brelse(bh);
|
| 232 |
|
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return NULL;
|
| 233 |
|
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}
|
| 234 |
|
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ebh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 235 |
|
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if (!ebh) {
|
| 236 |
|
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affs_free_block(inode->i_sb,key);
|
| 237 |
|
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return NULL;
|
| 238 |
|
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}
|
| 239 |
|
|
((struct file_front *)ebh->b_data)->primary_type = ntohl(T_LIST);
|
| 240 |
|
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((struct file_front *)ebh->b_data)->own_key = ntohl(key);
|
| 241 |
|
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FILE_END(ebh->b_data,inode)->secondary_type = ntohl(ST_FILE);
|
| 242 |
|
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FILE_END(ebh->b_data,inode)->parent = ntohl(inode->i_ino);
|
| 243 |
|
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affs_fix_checksum(AFFS_I2BSIZE(inode),ebh->b_data,5);
|
| 244 |
|
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FILE_END(bh->b_data,inode)->extension = ntohl(key);
|
| 245 |
|
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affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 246 |
|
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mark_buffer_dirty(bh,1);
|
| 247 |
|
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affs_brelse(bh);
|
| 248 |
|
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bh = ebh;
|
| 249 |
|
|
}
|
| 250 |
|
|
affs_brelse(bh);
|
| 251 |
|
|
pt = T_LIST;
|
| 252 |
|
|
if (ext < EXT_CACHE_SIZE - 1) {
|
| 253 |
|
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inode->u.affs_i.i_ext[ext] = key;
|
| 254 |
|
|
inode->u.affs_i.i_max_ext = ++ext;
|
| 255 |
|
|
}
|
| 256 |
|
|
}
|
| 257 |
|
|
key = htonl(AFFS_BLOCK(bh->b_data,inode,block));
|
| 258 |
|
|
affs_brelse(bh);
|
| 259 |
|
|
if (!key)
|
| 260 |
|
|
return NULL;
|
| 261 |
|
|
|
| 262 |
|
|
return affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 263 |
|
|
}
|
| 264 |
|
|
|
| 265 |
|
|
struct buffer_head *
|
| 266 |
|
|
affs_getblock_ofs(struct inode *inode, int block, int *blk_key)
|
| 267 |
|
|
{
|
| 268 |
|
|
struct buffer_head *bh;
|
| 269 |
|
|
struct buffer_head *pbh;
|
| 270 |
|
|
struct buffer_head *ebh;
|
| 271 |
|
|
int key;
|
| 272 |
|
|
int ext;
|
| 273 |
|
|
int cnt, j, pt;
|
| 274 |
|
|
|
| 275 |
|
|
pr_debug("AFFS: getblock_ofs(%lu,%d)\n",inode->i_ino,block);
|
| 276 |
|
|
|
| 277 |
|
|
if (block < 0)
|
| 278 |
|
|
return NULL;
|
| 279 |
|
|
key = inode->i_ino;
|
| 280 |
|
|
pt = T_SHORT;
|
| 281 |
|
|
|
| 282 |
|
|
ext = block / AFFS_I2HSIZE(inode);
|
| 283 |
|
|
if (ext) {
|
| 284 |
|
|
if (ext > inode->u.affs_i.i_max_ext)
|
| 285 |
|
|
ext = inode->u.affs_i.i_max_ext;
|
| 286 |
|
|
if (ext) {
|
| 287 |
|
|
key = inode->u.affs_i.i_ext[ext - 1];
|
| 288 |
|
|
block -= ext * AFFS_I2HSIZE(inode);
|
| 289 |
|
|
pt = T_LIST;
|
| 290 |
|
|
}
|
| 291 |
|
|
}
|
| 292 |
|
|
|
| 293 |
|
|
pbh = NULL;
|
| 294 |
|
|
for (;;) {
|
| 295 |
|
|
bh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 296 |
|
|
if (!bh)
|
| 297 |
|
|
return NULL;
|
| 298 |
|
|
if (affs_checksum_block(AFFS_I2BSIZE(inode),bh->b_data,&cnt,&j) ||
|
| 299 |
|
|
cnt != pt || j != ST_FILE) {
|
| 300 |
|
|
printk("AFFS: getblock(): inode %d is not a valid %s\n",key,
|
| 301 |
|
|
pt == T_SHORT ? "file header" : "extension block");
|
| 302 |
|
|
affs_brelse(bh);
|
| 303 |
|
|
return NULL;
|
| 304 |
|
|
}
|
| 305 |
|
|
j = htonl(((struct file_front *)bh->b_data)->block_count);
|
| 306 |
|
|
while (j < AFFS_I2HSIZE(inode) && j <= block) {
|
| 307 |
|
|
if (!pbh && inode->u.affs_i.i_lastblock >= 0) {
|
| 308 |
|
|
if (j > 0)
|
| 309 |
|
|
pbh = affs_bread(inode->i_dev,ntohl(AFFS_BLOCK(bh->b_data,inode,j - 1)),
|
| 310 |
|
|
AFFS_I2BSIZE(inode));
|
| 311 |
|
|
else
|
| 312 |
|
|
pbh = affs_getblock_ofs(inode,inode->u.affs_i.i_lastblock,&key);
|
| 313 |
|
|
if (!pbh) {
|
| 314 |
|
|
printk("AFFS: getblock(): cannot get last block in file\n");
|
| 315 |
|
|
break;
|
| 316 |
|
|
}
|
| 317 |
|
|
}
|
| 318 |
|
|
key = affs_new_data(inode);
|
| 319 |
|
|
if (!key)
|
| 320 |
|
|
break;
|
| 321 |
|
|
lock_super(inode->i_sb);
|
| 322 |
|
|
if (AFFS_BLOCK(bh->b_data,inode,j)) {
|
| 323 |
|
|
unlock_super(inode->i_sb);
|
| 324 |
|
|
printk("AFFS: getblock(): block already allocated\n");
|
| 325 |
|
|
affs_free_block(inode->i_sb,key);
|
| 326 |
|
|
j++;
|
| 327 |
|
|
continue;
|
| 328 |
|
|
}
|
| 329 |
|
|
AFFS_BLOCK(bh->b_data,inode,j) = ntohl(key);
|
| 330 |
|
|
unlock_super(inode->i_sb);
|
| 331 |
|
|
ebh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 332 |
|
|
if (!ebh) {
|
| 333 |
|
|
printk("AFFS: getblock(): cannot get block %d\n",key);
|
| 334 |
|
|
affs_free_block(inode->i_sb,key);
|
| 335 |
|
|
AFFS_BLOCK(bh->b_data,inode,j) = 0;
|
| 336 |
|
|
break;
|
| 337 |
|
|
}
|
| 338 |
|
|
inode->u.affs_i.i_lastblock++;
|
| 339 |
|
|
DATA_FRONT(ebh)->primary_type = ntohl(T_DATA);
|
| 340 |
|
|
DATA_FRONT(ebh)->header_key = ntohl(inode->i_ino);
|
| 341 |
|
|
DATA_FRONT(ebh)->sequence_number = ntohl(inode->u.affs_i.i_lastblock + 1);
|
| 342 |
|
|
if (pbh) {
|
| 343 |
|
|
DATA_FRONT(pbh)->data_size = ntohl(AFFS_I2BSIZE(inode) - 24);
|
| 344 |
|
|
DATA_FRONT(pbh)->next_data = ntohl(key);
|
| 345 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),pbh->b_data,5);
|
| 346 |
|
|
mark_buffer_dirty(pbh,0);
|
| 347 |
|
|
mark_buffer_dirty(ebh,0);
|
| 348 |
|
|
affs_brelse(pbh);
|
| 349 |
|
|
}
|
| 350 |
|
|
pbh = ebh;
|
| 351 |
|
|
j++;
|
| 352 |
|
|
}
|
| 353 |
|
|
if (pt == T_SHORT)
|
| 354 |
|
|
((struct file_front *)bh->b_data)->first_data =
|
| 355 |
|
|
AFFS_BLOCK(bh->b_data,inode,0);
|
| 356 |
|
|
((struct file_front *)bh->b_data)->block_count = ntohl(j);
|
| 357 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 358 |
|
|
mark_buffer_dirty(bh,1);
|
| 359 |
|
|
|
| 360 |
|
|
if (block < j) {
|
| 361 |
|
|
if (pbh)
|
| 362 |
|
|
affs_brelse(pbh);
|
| 363 |
|
|
break;
|
| 364 |
|
|
}
|
| 365 |
|
|
if (j < AFFS_I2HSIZE(inode)) {
|
| 366 |
|
|
affs_brelse(bh);
|
| 367 |
|
|
return NULL;
|
| 368 |
|
|
}
|
| 369 |
|
|
|
| 370 |
|
|
block -= AFFS_I2HSIZE(inode);
|
| 371 |
|
|
key = htonl(FILE_END(bh->b_data,inode)->extension);
|
| 372 |
|
|
if (!key) {
|
| 373 |
|
|
key = affs_new_header(inode);
|
| 374 |
|
|
if (!key) {
|
| 375 |
|
|
affs_brelse(bh);
|
| 376 |
|
|
return NULL;
|
| 377 |
|
|
}
|
| 378 |
|
|
ebh = affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 379 |
|
|
if (!ebh) {
|
| 380 |
|
|
affs_free_block(inode->i_sb,key);
|
| 381 |
|
|
return NULL;
|
| 382 |
|
|
}
|
| 383 |
|
|
((struct file_front *)ebh->b_data)->primary_type = ntohl(T_LIST);
|
| 384 |
|
|
((struct file_front *)ebh->b_data)->own_key = ntohl(key);
|
| 385 |
|
|
FILE_END(ebh->b_data,inode)->secondary_type = ntohl(ST_FILE);
|
| 386 |
|
|
FILE_END(ebh->b_data,inode)->parent = ntohl(inode->i_ino);
|
| 387 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),ebh->b_data,5);
|
| 388 |
|
|
FILE_END(bh->b_data,inode)->extension = ntohl(key);
|
| 389 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 390 |
|
|
mark_buffer_dirty(bh,1);
|
| 391 |
|
|
affs_brelse(bh);
|
| 392 |
|
|
bh = ebh;
|
| 393 |
|
|
}
|
| 394 |
|
|
affs_brelse(bh);
|
| 395 |
|
|
pt = T_LIST;
|
| 396 |
|
|
if (ext < EXT_CACHE_SIZE - 1) {
|
| 397 |
|
|
inode->u.affs_i.i_ext[ext] = key;
|
| 398 |
|
|
inode->u.affs_i.i_max_ext = ++ext;
|
| 399 |
|
|
}
|
| 400 |
|
|
}
|
| 401 |
|
|
key = htonl(AFFS_BLOCK(bh->b_data,inode,block));
|
| 402 |
|
|
affs_brelse(bh);
|
| 403 |
|
|
if (!key)
|
| 404 |
|
|
return NULL;
|
| 405 |
|
|
*blk_key = key;
|
| 406 |
|
|
|
| 407 |
|
|
return affs_bread(inode->i_dev,key,AFFS_I2BSIZE(inode));
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
/* This could be made static, regardless of what the former comment said.
|
| 411 |
|
|
* You cannot directly read affs directories.
|
| 412 |
|
|
*/
|
| 413 |
|
|
|
| 414 |
|
|
static int
|
| 415 |
|
|
affs_file_read_ofs(struct inode *inode, struct file *filp, char *buf, int count)
|
| 416 |
|
|
{
|
| 417 |
|
|
char *start;
|
| 418 |
|
|
int left, offset, size, sector;
|
| 419 |
|
|
int blocksize;
|
| 420 |
|
|
struct buffer_head *bh;
|
| 421 |
|
|
void *data;
|
| 422 |
|
|
|
| 423 |
|
|
pr_debug("AFFS: file_read_ofs(ino=%lu,pos=%lu,%d)\n",inode->i_ino,(long)filp->f_pos,count);
|
| 424 |
|
|
|
| 425 |
|
|
if (!inode) {
|
| 426 |
|
|
printk("affs_file_read: inode = NULL\n");
|
| 427 |
|
|
return -EINVAL;
|
| 428 |
|
|
}
|
| 429 |
|
|
blocksize = AFFS_I2BSIZE(inode) - 24;
|
| 430 |
|
|
if (!(S_ISREG(inode->i_mode))) {
|
| 431 |
|
|
pr_debug("affs_file_read: mode = %07o\n",inode->i_mode);
|
| 432 |
|
|
return -EINVAL;
|
| 433 |
|
|
}
|
| 434 |
|
|
if (filp->f_pos >= inode->i_size || count <= 0)
|
| 435 |
|
|
return 0;
|
| 436 |
|
|
|
| 437 |
|
|
start = buf;
|
| 438 |
|
|
for (;;) {
|
| 439 |
|
|
left = MIN (inode->i_size - filp->f_pos,count - (buf - start));
|
| 440 |
|
|
if (!left)
|
| 441 |
|
|
break;
|
| 442 |
|
|
sector = affs_bmap(inode,(__u32)filp->f_pos / blocksize);
|
| 443 |
|
|
if (!sector)
|
| 444 |
|
|
break;
|
| 445 |
|
|
offset = (__u32)filp->f_pos % blocksize;
|
| 446 |
|
|
bh = affs_bread(inode->i_dev,sector,AFFS_I2BSIZE(inode));
|
| 447 |
|
|
if (!bh)
|
| 448 |
|
|
break;
|
| 449 |
|
|
data = bh->b_data + 24;
|
| 450 |
|
|
size = MIN(blocksize - offset,left);
|
| 451 |
|
|
filp->f_pos += size;
|
| 452 |
|
|
memcpy_tofs(buf,data + offset,size);
|
| 453 |
|
|
buf += size;
|
| 454 |
|
|
affs_brelse(bh);
|
| 455 |
|
|
}
|
| 456 |
|
|
if (start == buf)
|
| 457 |
|
|
return -EIO;
|
| 458 |
|
|
return buf - start;
|
| 459 |
|
|
}
|
| 460 |
|
|
|
| 461 |
|
|
static int
|
| 462 |
|
|
affs_file_write(struct inode *inode, struct file *filp, const char *buf, int count)
|
| 463 |
|
|
{
|
| 464 |
|
|
off_t pos;
|
| 465 |
|
|
int written;
|
| 466 |
|
|
int c;
|
| 467 |
|
|
int blocksize;
|
| 468 |
|
|
struct buffer_head *bh;
|
| 469 |
|
|
struct inode *ino;
|
| 470 |
|
|
char *p;
|
| 471 |
|
|
|
| 472 |
|
|
pr_debug("AFFS: file_write(ino=%lu,pos=%lu,count=%d)\n",inode->i_ino,
|
| 473 |
|
|
(unsigned long)filp->f_pos,count);
|
| 474 |
|
|
|
| 475 |
|
|
ino = NULL;
|
| 476 |
|
|
if (!inode) {
|
| 477 |
|
|
printk("AFFS: file_write(): inode=NULL\n");
|
| 478 |
|
|
return -EINVAL;
|
| 479 |
|
|
}
|
| 480 |
|
|
if (inode->u.affs_i.i_original) {
|
| 481 |
|
|
ino = iget(inode->i_sb,inode->u.affs_i.i_original);
|
| 482 |
|
|
if (!ino) {
|
| 483 |
|
|
printk("AFFS: could not follow link from inode %lu to %d\n",
|
| 484 |
|
|
inode->i_ino,inode->u.affs_i.i_original);
|
| 485 |
|
|
return -EINVAL;
|
| 486 |
|
|
}
|
| 487 |
|
|
inode = ino;
|
| 488 |
|
|
}
|
| 489 |
|
|
if (!S_ISREG(inode->i_mode)) {
|
| 490 |
|
|
printk("AFFS: file_write(): mode=%07o\n",inode->i_mode);
|
| 491 |
|
|
iput(inode);
|
| 492 |
|
|
return -EINVAL;
|
| 493 |
|
|
}
|
| 494 |
|
|
if (filp->f_flags & O_APPEND) {
|
| 495 |
|
|
pos = inode->i_size;
|
| 496 |
|
|
} else
|
| 497 |
|
|
pos = filp->f_pos;
|
| 498 |
|
|
written = 0;
|
| 499 |
|
|
blocksize = AFFS_I2BSIZE(inode);
|
| 500 |
|
|
|
| 501 |
|
|
while (written < count) {
|
| 502 |
|
|
bh = affs_getblock(inode,pos / blocksize);
|
| 503 |
|
|
if (!bh) {
|
| 504 |
|
|
if (!written)
|
| 505 |
|
|
written = -ENOSPC;
|
| 506 |
|
|
break;
|
| 507 |
|
|
}
|
| 508 |
|
|
c = blocksize - (pos % blocksize);
|
| 509 |
|
|
if (c > count - written)
|
| 510 |
|
|
c = count - written;
|
| 511 |
|
|
if (c != blocksize && !buffer_uptodate(bh)) {
|
| 512 |
|
|
ll_rw_block(READ,1,&bh);
|
| 513 |
|
|
wait_on_buffer(bh);
|
| 514 |
|
|
if (!buffer_uptodate(bh)) {
|
| 515 |
|
|
affs_brelse(bh);
|
| 516 |
|
|
if (!written)
|
| 517 |
|
|
written = -EIO;
|
| 518 |
|
|
break;
|
| 519 |
|
|
}
|
| 520 |
|
|
}
|
| 521 |
|
|
p = (pos % blocksize) + bh->b_data;
|
| 522 |
|
|
memcpy_fromfs(p,buf,c);
|
| 523 |
|
|
update_vm_cache(inode,pos,p,c);
|
| 524 |
|
|
mark_buffer_uptodate(bh,1);
|
| 525 |
|
|
mark_buffer_dirty(bh,0);
|
| 526 |
|
|
affs_brelse(bh);
|
| 527 |
|
|
pos += c;
|
| 528 |
|
|
written += c;
|
| 529 |
|
|
buf += c;
|
| 530 |
|
|
}
|
| 531 |
|
|
if (pos > inode->i_size)
|
| 532 |
|
|
inode->i_size = pos;
|
| 533 |
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
| 534 |
|
|
filp->f_pos = pos;
|
| 535 |
|
|
inode->i_dirt = 1;
|
| 536 |
|
|
iput(ino);
|
| 537 |
|
|
return written;
|
| 538 |
|
|
}
|
| 539 |
|
|
|
| 540 |
|
|
static int
|
| 541 |
|
|
affs_file_write_ofs(struct inode *inode, struct file *filp, const char *buf, int count)
|
| 542 |
|
|
{
|
| 543 |
|
|
off_t pos;
|
| 544 |
|
|
int written;
|
| 545 |
|
|
int c;
|
| 546 |
|
|
int key;
|
| 547 |
|
|
int blocksize;
|
| 548 |
|
|
struct buffer_head *bh;
|
| 549 |
|
|
struct inode *ino;
|
| 550 |
|
|
char *p;
|
| 551 |
|
|
|
| 552 |
|
|
pr_debug("AFFS: file_write_ofs(ino=%lu,pos=%lu,count=%d)\n",inode->i_ino,
|
| 553 |
|
|
(unsigned long)filp->f_pos,count);
|
| 554 |
|
|
|
| 555 |
|
|
if (!inode) {
|
| 556 |
|
|
printk("AFFS: file_write_ofs(): inode=NULL\n");
|
| 557 |
|
|
return -EINVAL;
|
| 558 |
|
|
}
|
| 559 |
|
|
ino = NULL;
|
| 560 |
|
|
if (inode->u.affs_i.i_original) {
|
| 561 |
|
|
ino = iget(inode->i_sb,inode->u.affs_i.i_original);
|
| 562 |
|
|
if (!ino) {
|
| 563 |
|
|
printk("AFFS: could not follow link from inode %lu to %d\n",
|
| 564 |
|
|
inode->i_ino,inode->u.affs_i.i_original);
|
| 565 |
|
|
return -EINVAL;
|
| 566 |
|
|
}
|
| 567 |
|
|
inode = ino;
|
| 568 |
|
|
}
|
| 569 |
|
|
if (!S_ISREG(inode->i_mode)) {
|
| 570 |
|
|
printk("AFFS: file_write_ofs(): mode=%07o\n",inode->i_mode);
|
| 571 |
|
|
iput(inode);
|
| 572 |
|
|
return -EINVAL;
|
| 573 |
|
|
}
|
| 574 |
|
|
if (filp->f_flags & O_APPEND)
|
| 575 |
|
|
pos = inode->i_size;
|
| 576 |
|
|
else
|
| 577 |
|
|
pos = filp->f_pos;
|
| 578 |
|
|
|
| 579 |
|
|
bh = NULL;
|
| 580 |
|
|
blocksize = AFFS_I2BSIZE(inode) - 24;
|
| 581 |
|
|
written = 0;
|
| 582 |
|
|
while (written < count) {
|
| 583 |
|
|
bh = affs_getblock_ofs(inode,pos / blocksize,&key);
|
| 584 |
|
|
if (!bh) {
|
| 585 |
|
|
if (!written)
|
| 586 |
|
|
written = -ENOSPC;
|
| 587 |
|
|
break;
|
| 588 |
|
|
}
|
| 589 |
|
|
c = blocksize - (pos % blocksize);
|
| 590 |
|
|
if (c > count - written)
|
| 591 |
|
|
c = count - written;
|
| 592 |
|
|
if (c != blocksize && !buffer_uptodate(bh)) {
|
| 593 |
|
|
ll_rw_block(READ,1,&bh);
|
| 594 |
|
|
wait_on_buffer(bh);
|
| 595 |
|
|
if (!buffer_uptodate(bh)) {
|
| 596 |
|
|
affs_brelse(bh);
|
| 597 |
|
|
if (!written)
|
| 598 |
|
|
written = -EIO;
|
| 599 |
|
|
break;
|
| 600 |
|
|
}
|
| 601 |
|
|
}
|
| 602 |
|
|
p = (pos % blocksize) + bh->b_data + 24;
|
| 603 |
|
|
memcpy_fromfs(p,buf,c);
|
| 604 |
|
|
update_vm_cache(inode,pos,p,c);
|
| 605 |
|
|
|
| 606 |
|
|
pos += c;
|
| 607 |
|
|
buf += c;
|
| 608 |
|
|
written += c;
|
| 609 |
|
|
DATA_FRONT(bh)->data_size = ntohl(htonl(DATA_FRONT(bh)->data_size) + c);
|
| 610 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 611 |
|
|
mark_buffer_uptodate(bh,1);
|
| 612 |
|
|
mark_buffer_dirty(bh,0);
|
| 613 |
|
|
affs_brelse(bh);
|
| 614 |
|
|
}
|
| 615 |
|
|
if (pos > inode->i_size)
|
| 616 |
|
|
inode->i_size = pos;
|
| 617 |
|
|
filp->f_pos = pos;
|
| 618 |
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
| 619 |
|
|
inode->i_dirt = 1;
|
| 620 |
|
|
iput(ino);
|
| 621 |
|
|
return written;
|
| 622 |
|
|
}
|
| 623 |
|
|
|
| 624 |
|
|
void
|
| 625 |
|
|
affs_truncate(struct inode *inode)
|
| 626 |
|
|
{
|
| 627 |
|
|
struct buffer_head *bh;
|
| 628 |
|
|
struct buffer_head *ebh;
|
| 629 |
|
|
struct inode *ino;
|
| 630 |
|
|
struct affs_zone *zone;
|
| 631 |
|
|
int first;
|
| 632 |
|
|
int block;
|
| 633 |
|
|
int key;
|
| 634 |
|
|
int *keyp;
|
| 635 |
|
|
int ekey;
|
| 636 |
|
|
int ptype, stype;
|
| 637 |
|
|
int freethis;
|
| 638 |
|
|
int blocksize;
|
| 639 |
|
|
int rem;
|
| 640 |
|
|
int ext;
|
| 641 |
|
|
|
| 642 |
|
|
pr_debug("AFFS: file_truncate(inode=%ld,size=%lu)\n",inode->i_ino,inode->i_size);
|
| 643 |
|
|
|
| 644 |
|
|
ino = NULL;
|
| 645 |
|
|
if (inode->u.affs_i.i_original) {
|
| 646 |
|
|
ino = iget(inode->i_sb,inode->u.affs_i.i_original);
|
| 647 |
|
|
if (!ino) {
|
| 648 |
|
|
printk("AFFS: truncate(): cannot follow link from %lu to %u\n",
|
| 649 |
|
|
inode->i_ino,inode->u.affs_i.i_original);
|
| 650 |
|
|
return;
|
| 651 |
|
|
}
|
| 652 |
|
|
inode = ino;
|
| 653 |
|
|
}
|
| 654 |
|
|
blocksize = AFFS_I2BSIZE(inode) - ((inode->i_sb->u.affs_sb.s_flags & SF_OFS) ? 24 : 0);
|
| 655 |
|
|
first = (inode->i_size + blocksize - 1) / blocksize;
|
| 656 |
|
|
if (inode->u.affs_i.i_lastblock < first - 1) {
|
| 657 |
|
|
if (inode->i_sb->u.affs_sb.s_flags & SF_OFS)
|
| 658 |
|
|
bh = affs_getblock_ofs(inode,first - 1,&ekey);
|
| 659 |
|
|
else
|
| 660 |
|
|
bh = affs_getblock(inode,first - 1);
|
| 661 |
|
|
|
| 662 |
|
|
while (inode->u.affs_i.i_pa_cnt) { /* Free any preallocated blocks */
|
| 663 |
|
|
affs_free_block(inode->i_sb,
|
| 664 |
|
|
inode->u.affs_i.i_data[inode->u.affs_i.i_pa_next++]);
|
| 665 |
|
|
inode->u.affs_i.i_pa_next &= MAX_PREALLOC - 1;
|
| 666 |
|
|
inode->u.affs_i.i_pa_cnt--;
|
| 667 |
|
|
}
|
| 668 |
|
|
if (inode->u.affs_i.i_zone) {
|
| 669 |
|
|
lock_super(inode->i_sb);
|
| 670 |
|
|
zone = &inode->i_sb->u.affs_sb.s_zones[inode->u.affs_i.i_zone];
|
| 671 |
|
|
if (zone->z_ino == inode->i_ino)
|
| 672 |
|
|
zone->z_ino = 0;
|
| 673 |
|
|
unlock_super(inode->i_sb);
|
| 674 |
|
|
}
|
| 675 |
|
|
if (!bh) {
|
| 676 |
|
|
printk("AFFS: truncate(): Cannot extend file\n");
|
| 677 |
|
|
inode->i_size = blocksize * (inode->u.affs_i.i_lastblock + 1);
|
| 678 |
|
|
} else if (inode->i_sb->u.affs_sb.s_flags & SF_OFS) {
|
| 679 |
|
|
rem = inode->i_size % blocksize;
|
| 680 |
|
|
DATA_FRONT(bh)->data_size = ntohl(rem ? rem : blocksize);
|
| 681 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 682 |
|
|
mark_buffer_dirty(bh,0);
|
| 683 |
|
|
}
|
| 684 |
|
|
affs_brelse(bh);
|
| 685 |
|
|
iput(ino);
|
| 686 |
|
|
return;
|
| 687 |
|
|
}
|
| 688 |
|
|
ekey = inode->i_ino;
|
| 689 |
|
|
ext = 0;
|
| 690 |
|
|
|
| 691 |
|
|
while (ekey) {
|
| 692 |
|
|
if (!(bh = affs_bread(inode->i_dev,ekey,AFFS_I2BSIZE(inode)))) {
|
| 693 |
|
|
printk("AFFS: truncate(): Can't read block %d\n",ekey);
|
| 694 |
|
|
break;
|
| 695 |
|
|
}
|
| 696 |
|
|
ptype = htonl(((struct file_front *)bh->b_data)->primary_type);
|
| 697 |
|
|
stype = htonl(FILE_END(bh->b_data,inode)->secondary_type);
|
| 698 |
|
|
if (ekey == inode->i_ino && ptype == T_SHORT && stype == ST_LINKFILE &&
|
| 699 |
|
|
LINK_END(bh->b_data,inode)->original == 0) {
|
| 700 |
|
|
pr_debug("AFFS: truncate(): dumping link\n");
|
| 701 |
|
|
affs_brelse(bh);
|
| 702 |
|
|
break;
|
| 703 |
|
|
}
|
| 704 |
|
|
if (stype != ST_FILE || (ptype != T_SHORT && ptype != T_LIST)) {
|
| 705 |
|
|
printk("AFFS: truncate(): bad block (ptype=%d, stype=%d)\n",
|
| 706 |
|
|
ptype,stype);
|
| 707 |
|
|
affs_brelse(bh);
|
| 708 |
|
|
break;
|
| 709 |
|
|
}
|
| 710 |
|
|
/* Do not throw away file header */
|
| 711 |
|
|
freethis = first == 0 && ekey != inode->i_ino;
|
| 712 |
|
|
for ( block = first; block < AFFS_I2HSIZE(inode); block++) {
|
| 713 |
|
|
keyp = &AFFS_BLOCK(bh->b_data,inode,block);
|
| 714 |
|
|
key = htonl(*keyp);
|
| 715 |
|
|
if (key) {
|
| 716 |
|
|
*keyp = 0;
|
| 717 |
|
|
affs_free_block(inode->i_sb,key);
|
| 718 |
|
|
} else {
|
| 719 |
|
|
block = AFFS_I2HSIZE(inode);
|
| 720 |
|
|
break;
|
| 721 |
|
|
}
|
| 722 |
|
|
}
|
| 723 |
|
|
keyp = &GET_END_PTR(struct file_end,bh->b_data,AFFS_I2BSIZE(inode))->extension;
|
| 724 |
|
|
key = htonl(*keyp);
|
| 725 |
|
|
if (first <= AFFS_I2HSIZE(inode)) {
|
| 726 |
|
|
((struct file_front *)bh->b_data)->block_count = htonl(first);
|
| 727 |
|
|
first = 0;
|
| 728 |
|
|
*keyp = 0;
|
| 729 |
|
|
if ((inode->i_sb->u.affs_sb.s_flags & SF_OFS) && first > 0) {
|
| 730 |
|
|
block = htonl(AFFS_BLOCK(bh->b_data,inode,first - 1));
|
| 731 |
|
|
if ((ebh = affs_bread(inode->i_dev,block,AFFS_I2BSIZE(inode)))) {
|
| 732 |
|
|
if(!(affs_checksum_block(AFFS_I2BSIZE(inode),ebh->b_data,
|
| 733 |
|
|
&ptype,NULL))) {
|
| 734 |
|
|
rem = inode->i_size % blocksize;
|
| 735 |
|
|
rem = ntohl(rem ? blocksize : rem);
|
| 736 |
|
|
((struct data_front *)ebh->b_data)->data_size = rem;
|
| 737 |
|
|
((struct data_front *)ebh->b_data)->next_data = 0;
|
| 738 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),ebh->b_data,5);
|
| 739 |
|
|
mark_buffer_dirty(ebh,1);
|
| 740 |
|
|
}
|
| 741 |
|
|
affs_brelse(ebh);
|
| 742 |
|
|
}
|
| 743 |
|
|
}
|
| 744 |
|
|
} else {
|
| 745 |
|
|
first -= AFFS_I2HSIZE(inode);
|
| 746 |
|
|
}
|
| 747 |
|
|
if (freethis) { /* Don't bother fixing checksum */
|
| 748 |
|
|
affs_brelse(bh);
|
| 749 |
|
|
affs_free_block(inode->i_sb,ekey);
|
| 750 |
|
|
} else {
|
| 751 |
|
|
affs_fix_checksum(AFFS_I2BSIZE(inode),bh->b_data,5);
|
| 752 |
|
|
mark_buffer_dirty(bh,1);
|
| 753 |
|
|
affs_brelse(bh);
|
| 754 |
|
|
}
|
| 755 |
|
|
ekey = key;
|
| 756 |
|
|
}
|
| 757 |
|
|
inode->u.affs_i.i_lastblock = ((inode->i_size + blocksize - 1) / blocksize) - 1;
|
| 758 |
|
|
inode->u.affs_i.i_max_ext = 0;
|
| 759 |
|
|
iput(ino);
|
| 760 |
|
|
}
|
| 761 |
|
|
|
| 762 |
|
|
static void
|
| 763 |
|
|
affs_release_file(struct inode *inode, struct file *filp)
|
| 764 |
|
|
{
|
| 765 |
|
|
struct affs_zone *zone;
|
| 766 |
|
|
|
| 767 |
|
|
pr_debug("AFFS: release_file(ino=%lu)\n",inode->i_ino);
|
| 768 |
|
|
|
| 769 |
|
|
if (filp->f_mode & 2) { /* Free preallocated blocks */
|
| 770 |
|
|
while (inode->u.affs_i.i_pa_cnt) {
|
| 771 |
|
|
affs_free_block(inode->i_sb,
|
| 772 |
|
|
inode->u.affs_i.i_data[inode->u.affs_i.i_pa_next++]);
|
| 773 |
|
|
inode->u.affs_i.i_pa_next &= MAX_PREALLOC - 1;
|
| 774 |
|
|
inode->u.affs_i.i_pa_cnt--;
|
| 775 |
|
|
}
|
| 776 |
|
|
if (inode->u.affs_i.i_zone) {
|
| 777 |
|
|
lock_super(inode->i_sb);
|
| 778 |
|
|
zone = &inode->i_sb->u.affs_sb.s_zones[inode->u.affs_i.i_zone];
|
| 779 |
|
|
if (zone->z_ino == inode->i_ino)
|
| 780 |
|
|
zone->z_ino = 0;
|
| 781 |
|
|
unlock_super(inode->i_sb);
|
| 782 |
|
|
}
|
| 783 |
|
|
}
|
| 784 |
|
|
}
|
