Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | /* * linux/fs/sysv/fsync.c * * minix/fsync.c * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk) * * coh/fsync.c * Copyright (C) 1993 Pascal Haible, Bruno Haible * * sysv/fsync.c * Copyright (C) 1993 Bruno Haible * * SystemV/Coherent fsync primitive */ #include <linux/errno.h> #include <linux/stat.h> #include <linux/fs.h> #include <linux/sysv_fs.h> /* return values: 0 means OK/done, 1 means redo, -1 means I/O error. */ /* Sync one block. The block number is * from_coh_ulong(*blockp) if convert=1, *blockp if convert=0. */ static int sync_block (struct inode * inode, unsigned long * blockp, int convert, int wait) { struct buffer_head * bh; unsigned long tmp, block; struct super_block * sb; block = tmp = *blockp; if (convert) block = from_coh_ulong(block); if (!block) return 0; sb = inode->i_sb; bh = sv_get_hash_table(sb, inode->i_dev, block); if (!bh) return 0; if (*blockp != tmp) { brelse (bh); return 1; } if (wait && buffer_req(bh) && !buffer_uptodate(bh)) { brelse(bh); return -1; } if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) { brelse(bh); return 0; } ll_rw_block(WRITE, 1, &bh); bh->b_count--; return 0; } /* Sync one block full of indirect pointers and read it because we'll need it. */ static int sync_iblock (struct inode * inode, unsigned long * iblockp, int convert, struct buffer_head * *bh, int wait) { int rc; unsigned long tmp, block; *bh = NULL; block = tmp = *iblockp; if (convert) block = from_coh_ulong(block); if (!block) return 0; rc = sync_block (inode, iblockp, convert, wait); if (rc) return rc; *bh = sv_bread(inode->i_sb, inode->i_dev, block); if (tmp != *iblockp) { 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 < 10; i++) { rc = sync_block (inode, inode->u.sysv_i.i_data + i, 0, wait); if (rc > 0) break; if (rc) err = rc; } return err; } static int sync_indirect(struct inode *inode, unsigned long *iblockp, int convert, int wait) { int i; struct buffer_head * ind_bh; int rc, err = 0; struct super_block * sb; rc = sync_iblock (inode, iblockp, convert, &ind_bh, wait); if (rc || !ind_bh) return rc; sb = inode->i_sb; for (i = 0; i < sb->sv_ind_per_block; i++) { rc = sync_block (inode, ((unsigned long *) ind_bh->b_data) + i, sb->sv_convert, wait); if (rc > 0) break; if (rc) err = rc; } brelse(ind_bh); return err; } static int sync_dindirect(struct inode *inode, unsigned long *diblockp, int convert, int wait) { int i; struct buffer_head * dind_bh; int rc, err = 0; struct super_block * sb; rc = sync_iblock (inode, diblockp, convert, &dind_bh, wait); if (rc || !dind_bh) return rc; sb = inode->i_sb; for (i = 0; i < sb->sv_ind_per_block; i++) { rc = sync_indirect (inode, ((unsigned long *) dind_bh->b_data) + i, sb->sv_convert, wait); if (rc > 0) break; if (rc) err = rc; } brelse(dind_bh); return err; } static int sync_tindirect(struct inode *inode, unsigned long *tiblockp, int convert, int wait) { int i; struct buffer_head * tind_bh; int rc, err = 0; struct super_block * sb; rc = sync_iblock (inode, tiblockp, convert, &tind_bh, wait); if (rc || !tind_bh) return rc; sb = inode->i_sb; for (i = 0; i < sb->sv_ind_per_block; i++) { rc = sync_dindirect (inode, ((unsigned long *) tind_bh->b_data) + i, sb->sv_convert, wait); if (rc > 0) break; if (rc) err = rc; } brelse(tind_bh); return err; } int sysv_sync_file(struct file * file, struct dentry *dentry) { int wait, err = 0; struct inode *inode = dentry->d_inode; 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.sysv_i.i_data+10, 0, wait); err |= sync_dindirect(inode, inode->u.sysv_i.i_data+11, 0, wait); err |= sync_tindirect(inode, inode->u.sysv_i.i_data+12, 0, wait); } err |= sysv_sync_inode (inode); return (err < 0) ? -EIO : 0; } |