198 lines
3.9 KiB
C
198 lines
3.9 KiB
C
/*
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* linux/fs/ext2/fsync.c
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*
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* Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
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* from
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* Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext2fs fsync primitive
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*/
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/fcntl.h>
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#include <linux/sched.h>
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#include <linux/stat.h>
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#include <linux/locks.h>
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#define blocksize (EXT2_BLOCK_SIZE(inode->i_sb))
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#define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb))
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static int sync_block (struct inode * inode, unsigned long * block, int wait)
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{
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struct buffer_head * bh;
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int tmp;
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if (!*block)
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return 0;
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tmp = *block;
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bh = get_hash_table (inode->i_dev, *block, blocksize);
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if (!bh)
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return 0;
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if (*block != tmp) {
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brelse (bh);
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return 1;
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}
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if (wait && bh->b_req && !bh->b_uptodate) {
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brelse (bh);
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return -1;
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}
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if (wait || !bh->b_uptodate || !bh->b_dirt) {
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brelse (bh);
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return 0;
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}
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ll_rw_block (WRITE, 1, &bh);
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bh->b_count--;
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return 0;
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}
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static int sync_iblock (struct inode * inode, unsigned long * iblock,
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struct buffer_head ** bh, int wait)
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{
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int rc, tmp;
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*bh = NULL;
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tmp = *iblock;
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if (!tmp)
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return 0;
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rc = sync_block (inode, iblock, wait);
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if (rc)
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return rc;
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*bh = bread (inode->i_dev, tmp, blocksize);
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if (tmp != *iblock) {
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brelse (*bh);
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*bh = NULL;
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return 1;
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}
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if (!*bh)
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return -1;
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return 0;
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}
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static int sync_direct (struct inode * inode, int wait)
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{
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int i;
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int rc, err = 0;
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for (i = 0; i < EXT2_NDIR_BLOCKS; i++) {
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rc = sync_block (inode, inode->u.ext2_i.i_data + i, wait);
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if (rc > 0)
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break;
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if (rc)
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err = rc;
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}
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return err;
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}
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static int sync_indirect (struct inode * inode, unsigned long * iblock,
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int wait)
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{
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int i;
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struct buffer_head * ind_bh;
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int rc, err = 0;
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rc = sync_iblock (inode, iblock, &ind_bh, wait);
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if (rc || !ind_bh)
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return rc;
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for (i = 0; i < addr_per_block; i++) {
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rc = sync_block (inode,
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((unsigned long *) ind_bh->b_data) + i,
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wait);
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if (rc > 0)
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break;
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if (rc)
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err = rc;
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}
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brelse (ind_bh);
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return err;
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}
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static int sync_dindirect (struct inode * inode, unsigned long * diblock,
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int wait)
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{
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int i;
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struct buffer_head * dind_bh;
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int rc, err = 0;
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rc = sync_iblock (inode, diblock, &dind_bh, wait);
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if (rc || !dind_bh)
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return rc;
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for (i = 0; i < addr_per_block; i++) {
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rc = sync_indirect (inode,
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((unsigned long *) dind_bh->b_data) + i,
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wait);
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if (rc > 0)
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break;
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if (rc)
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err = rc;
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}
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brelse (dind_bh);
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return err;
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}
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static int sync_tindirect (struct inode * inode, unsigned long * tiblock,
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int wait)
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{
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int i;
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struct buffer_head * tind_bh;
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int rc, err = 0;
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rc = sync_iblock (inode, tiblock, &tind_bh, wait);
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if (rc || !tind_bh)
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return rc;
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for (i = 0; i < addr_per_block; i++) {
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rc = sync_dindirect (inode,
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((unsigned long *) tind_bh->b_data) + i,
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wait);
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if (rc > 0)
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break;
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if (rc)
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err = rc;
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}
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brelse (tind_bh);
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return err;
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}
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int ext2_sync_file (struct inode * inode, struct file * file)
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{
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int wait, err = 0;
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if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
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S_ISLNK(inode->i_mode)))
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return -EINVAL;
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if (S_ISLNK(inode->i_mode) && !(inode->i_blocks))
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/*
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* Don't sync fast links!
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*/
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goto skip;
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for (wait=0; wait<=1; wait++)
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{
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err |= sync_direct (inode, wait);
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err |= sync_indirect (inode,
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inode->u.ext2_i.i_data+EXT2_IND_BLOCK,
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wait);
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err |= sync_dindirect (inode,
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inode->u.ext2_i.i_data+EXT2_DIND_BLOCK,
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wait);
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err |= sync_tindirect (inode,
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inode->u.ext2_i.i_data+EXT2_TIND_BLOCK,
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wait);
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}
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skip:
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err |= ext2_sync_inode (inode);
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return (err < 0) ? -EIO : 0;
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}
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