/* * linux/fs/minix/fsync.c * * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk) * from * Copyright (C) 1991, 1992 Linus Torvalds * * minix fsync primitive */ #ifdef MODULE #include #endif #include #include #include #include #include #include #include #include #include #define blocksize BLOCK_SIZE #define addr_per_block 512 static int sync_block (struct inode * inode, unsigned short * block, int wait) { struct buffer_head * bh; unsigned short 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 short * iblock, struct buffer_head **bh, int wait) { int rc; unsigned short 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 < 7; i++) { rc = sync_block (inode, inode->u.minix_i.i_data + i, wait); if (rc > 0) break; if (rc) err = rc; } return err; } static int sync_indirect(struct inode *inode, unsigned short *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 short *) 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 short *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 short *) dind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(dind_bh); return err; } int minix_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.minix_i.i_data+7, wait); err |= sync_dindirect(inode, inode->u.minix_i.i_data+8, wait); } err |= minix_sync_inode (inode); return (err < 0) ? -EIO : 0; }