projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * QNX4 file system, Linux implementation. | |
| 3 | * | |
| 4 | * Version : 0.1 | |
| 5 | * | |
| 6 | * Using parts of the xiafs filesystem. | |
| 7 | * | |
| 8 | * History : | |
| 9 | * | |
| 10 | * 24-03-1998 by Richard Frowijn : first release. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/config.h> | |
| 14 | #include <linux/errno.h> | |
| 15 | #include <linux/time.h> | |
| 16 | #include <linux/stat.h> | |
| 17 | #include <linux/fcntl.h> | |
| 18 | #include <linux/smp_lock.h> | |
| 19 | #include <linux/buffer_head.h> | |
| 20 | ||
| 21 | #include <linux/fs.h> | |
| 22 | #include <linux/qnx4_fs.h> | |
| 23 | ||
| 24 | #include <asm/system.h> | |
| 25 | ||
| 26 | /* | |
| 27 | * The functions for qnx4 fs file synchronization. | |
| 28 | */ | |
| 29 | ||
| 30 | #ifdef CONFIG_QNX4FS_RW | |
| 31 | ||
| 32 | static int sync_block(struct inode *inode, unsigned short *block, int wait) | |
| 33 | { | |
| 34 | struct buffer_head *bh; | |
| 35 | unsigned short tmp; | |
| 36 | ||
| 37 | if (!*block) | |
| 38 | return 0; | |
| 39 | tmp = *block; | |
| 40 | bh = sb_find_get_block(inode->i_sb, *block); | |
| 41 | if (!bh) | |
| 42 | return 0; | |
| 43 | if (*block != tmp) { | |
| 44 | brelse(bh); | |
| 45 | return 1; | |
| 46 | } | |
| 47 | if (wait && buffer_req(bh) && !buffer_uptodate(bh)) { | |
| 48 | brelse(bh); | |
| 49 | return -1; | |
| 50 | } | |
| 51 | if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) { | |
| 52 | brelse(bh); | |
| 53 | return 0; | |
| 54 | } | |
| 55 | ll_rw_block(WRITE, 1, &bh); | |
| 56 | atomic_dec(&bh->b_count); | |
| 57 | return 0; | |
| 58 | } | |
| 59 | ||
| 60 | #ifdef WTF | |
| 61 | static int sync_iblock(struct inode *inode, unsigned short *iblock, | |
| 62 | struct buffer_head **bh, int wait) | |
| 63 | { | |
| 64 | int rc; | |
| 65 | unsigned short tmp; | |
| 66 | ||
| 67 | *bh = NULL; | |
| 68 | tmp = *iblock; | |
| 69 | if (!tmp) | |
| 70 | return 0; | |
| 71 | rc = sync_block(inode, iblock, wait); | |
| 72 | if (rc) | |
| 73 | return rc; | |
| 74 | *bh = sb_bread(inode->i_sb, tmp); | |
| 75 | if (tmp != *iblock) { | |
| 76 | brelse(*bh); | |
| 77 | *bh = NULL; | |
| 78 | return 1; | |
| 79 | } | |
| 80 | if (!*bh) | |
| 81 | return -1; | |
| 82 | return 0; | |
| 83 | } | |
| 84 | #endif | |
| 85 | ||
| 86 | static int sync_direct(struct inode *inode, int wait) | |
| 87 | { | |
| 88 | int i; | |
| 89 | int rc, err = 0; | |
| 90 | ||
| 91 | for (i = 0; i < 7; i++) { | |
| 92 | rc = sync_block(inode, | |
| 93 | (unsigned short *) qnx4_raw_inode(inode)->di_first_xtnt.xtnt_blk + i, wait); | |
| 94 | if (rc > 0) | |
| 95 | break; | |
| 96 | if (rc) | |
| 97 | err = rc; | |
| 98 | } | |
| 99 | return err; | |
| 100 | } | |
| 101 | ||
| 102 | #ifdef WTF | |
| 103 | static int sync_indirect(struct inode *inode, unsigned short *iblock, int wait) | |
| 104 | { | |
| 105 | int i; | |
| 106 | struct buffer_head *ind_bh; | |
| 107 | int rc, err = 0; | |
| 108 | ||
| 109 | rc = sync_iblock(inode, iblock, &ind_bh, wait); | |
| 110 | if (rc || !ind_bh) | |
| 111 | return rc; | |
| 112 | ||
| 113 | for (i = 0; i < 512; i++) { | |
| 114 | rc = sync_block(inode, | |
| 115 | ((unsigned short *) ind_bh->b_data) + i, | |
| 116 | wait); | |
| 117 | if (rc > 0) | |
| 118 | break; | |
| 119 | if (rc) | |
| 120 | err = rc; | |
| 121 | } | |
| 122 | brelse(ind_bh); | |
| 123 | return err; | |
| 124 | } | |
| 125 | ||
| 126 | static int sync_dindirect(struct inode *inode, unsigned short *diblock, | |
| 127 | int wait) | |
| 128 | { | |
| 129 | int i; | |
| 130 | struct buffer_head *dind_bh; | |
| 131 | int rc, err = 0; | |
| 132 | ||
| 133 | rc = sync_iblock(inode, diblock, &dind_bh, wait); | |
| 134 | if (rc || !dind_bh) | |
| 135 | return rc; | |
| 136 | ||
| 137 | for (i = 0; i < 512; i++) { | |
| 138 | rc = sync_indirect(inode, | |
| 139 | ((unsigned short *) dind_bh->b_data) + i, | |
| 140 | wait); | |
| 141 | if (rc > 0) | |
| 142 | break; | |
| 143 | if (rc) | |
| 144 | err = rc; | |
| 145 | } | |
| 146 | brelse(dind_bh); | |
| 147 | return err; | |
| 148 | } | |
| 149 | #endif | |
| 150 | ||
| 151 | int qnx4_sync_file(struct file *file, struct dentry *dentry, int unused) | |
| 152 | { | |
| 153 | struct inode *inode = dentry->d_inode; | |
| 154 | int wait, err = 0; | |
| 155 | ||
| 156 | (void) file; | |
| 157 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || | |
| 158 | S_ISLNK(inode->i_mode))) | |
| 159 | return -EINVAL; | |
| 160 | ||
| 161 | lock_kernel(); | |
| 162 | for (wait = 0; wait <= 1; wait++) { | |
| 163 | err |= sync_direct(inode, wait); | |
| 164 | } | |
| 165 | err |= qnx4_sync_inode(inode); | |
| 166 | unlock_kernel(); | |
| 167 | return (err < 0) ? -EIO : 0; | |
| 168 | } | |
| 169 | ||
| 170 | #endif |