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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | /* * linux/fs/ext/fsync.c * * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk) * from * Copyright (C) 1992 Remy Card (card@masi.ibp.fr) * from * linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds * * extfs fsync primitive */ #include <asm/segment.h> #include <asm/system.h> #include <linux/errno.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/locks.h> #include <linux/fs.h> #include <linux/ext_fs.h> #define blocksize BLOCK_SIZE #define addr_per_block 256 static int sync_block (struct inode * inode, unsigned long * block, int wait) { struct buffer_head * bh; int tmp; if (!*block) return 0; tmp = *block; bh = get_hash_table(inode->i_dev, *block, blocksize); if (!bh) return 0; if (*block != tmp) { brelse (bh); return 1; } if (wait && bh->b_req && !bh->b_uptodate) { brelse(bh); return -1; } if (wait || !bh->b_uptodate || !bh->b_dirt) { brelse(bh); return 0; } ll_rw_block(WRITE, 1, &bh); bh->b_count--; return 0; } static int sync_iblock (struct inode * inode, unsigned long * iblock, struct buffer_head **bh, int wait) { int rc, tmp; *bh = NULL; tmp = *iblock; if (!tmp) return 0; rc = sync_block (inode, iblock, wait); if (rc) return rc; *bh = bread(inode->i_dev, tmp, blocksize); if (tmp != *iblock) { brelse(*bh); *bh = NULL; return 1; } if (!*bh) return -1; return 0; } static int sync_direct(struct inode *inode, int wait) { int i; int rc, err = 0; for (i = 0; i < 9; i++) { rc = sync_block (inode, inode->u.ext_i.i_data + i, wait); if (rc > 0) break; if (rc) err = rc; } return err; } static int sync_indirect(struct inode *inode, unsigned long *iblock, int wait) { int i; struct buffer_head * ind_bh; int rc, err = 0; rc = sync_iblock (inode, iblock, &ind_bh, wait); if (rc || !ind_bh) return rc; for (i = 0; i < addr_per_block; i++) { rc = sync_block (inode, ((unsigned long *) ind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(ind_bh); return err; } static int sync_dindirect(struct inode *inode, unsigned long *diblock, int wait) { int i; struct buffer_head * dind_bh; int rc, err = 0; rc = sync_iblock (inode, diblock, &dind_bh, wait); if (rc || !dind_bh) return rc; for (i = 0; i < addr_per_block; i++) { rc = sync_indirect (inode, ((unsigned long *) dind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(dind_bh); return err; } static int sync_tindirect(struct inode *inode, unsigned long *tiblock, int wait) { int i; struct buffer_head * tind_bh; int rc, err = 0; rc = sync_iblock (inode, tiblock, &tind_bh, wait); if (rc || !tind_bh) return rc; for (i = 0; i < addr_per_block; i++) { rc = sync_dindirect (inode, ((unsigned long *) tind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(tind_bh); return err; } int ext_sync_file(struct inode * inode, struct file *file) { int wait, err = 0; if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) return -EINVAL; for (wait=0; wait<=1; wait++) { err |= sync_direct(inode, wait); err |= sync_indirect(inode, inode->u.ext_i.i_data+9, wait); err |= sync_dindirect(inode, inode->u.ext_i.i_data+10, wait); err |= sync_tindirect(inode, inode->u.ext_i.i_data+11, wait); } err |= ext_sync_inode (inode); return (err < 0) ? -EIO : 0; } |