[PATCH] fat: Fix truncate() write ordering
The truncate() should write the file size before writing the new EOF entry. This patch fixes it. This bug was pointed out by Machida Hiroyuki. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -210,10 +210,30 @@ static int fat_free(struct inode *inode, int skip)
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if (MSDOS_I(inode)->i_start == 0)
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return 0;
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/*
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* Write a new EOF, and get the remaining cluster chain for freeing.
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*/
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fat_cache_inval_inode(inode);
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wait = IS_DIRSYNC(inode);
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i_start = free_start = MSDOS_I(inode)->i_start;
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i_logstart = MSDOS_I(inode)->i_logstart;
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/* First, we write the new file size. */
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if (!skip) {
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MSDOS_I(inode)->i_start = 0;
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MSDOS_I(inode)->i_logstart = 0;
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}
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MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
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inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
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if (wait) {
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err = fat_sync_inode(inode);
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if (err) {
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MSDOS_I(inode)->i_start = i_start;
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MSDOS_I(inode)->i_logstart = i_logstart;
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return err;
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}
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} else
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mark_inode_dirty(inode);
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/* Write a new EOF, and get the remaining cluster chain for freeing. */
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if (skip) {
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struct fat_entry fatent;
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int ret, fclus, dclus;
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@ -244,35 +264,11 @@ static int fat_free(struct inode *inode, int skip)
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return ret;
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free_start = ret;
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i_start = i_logstart = 0;
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fat_cache_inval_inode(inode);
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} else {
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fat_cache_inval_inode(inode);
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i_start = free_start = MSDOS_I(inode)->i_start;
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i_logstart = MSDOS_I(inode)->i_logstart;
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MSDOS_I(inode)->i_start = 0;
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MSDOS_I(inode)->i_logstart = 0;
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}
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MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
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inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
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if (wait) {
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err = fat_sync_inode(inode);
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if (err)
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goto error;
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} else
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mark_inode_dirty(inode);
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inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
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/* Freeing the remained cluster chain */
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return fat_free_clusters(inode, free_start);
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error:
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if (i_start) {
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MSDOS_I(inode)->i_start = i_start;
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MSDOS_I(inode)->i_logstart = i_logstart;
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}
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return err;
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}
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void fat_truncate(struct inode *inode)
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