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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* valid_blk.c --- does the inode have valid blocks?
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*
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* Copyright 1997 by Theodore Ts'o
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*
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*/
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <time.h>
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#include "ext2_fs.h"
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#include "ext2fs.h"
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/*
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* This function returns 1 if the inode's block entries actually
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* contain block entries.
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*/
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int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
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{
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/*
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* Only directories, regular files, and some symbolic links
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* have valid block entries.
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*/
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if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) &&
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!LINUX_S_ISLNK(inode->i_mode))
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return 0;
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/*
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* If the symbolic link is a "fast symlink", then the symlink
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* target is stored in the block entries.
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*/
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if (LINUX_S_ISLNK (inode->i_mode)) {
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if (inode->i_file_acl == 0) {
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/* With no EA block, we can rely on i_blocks */
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if (inode->i_blocks == 0)
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return 0;
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} else {
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/* With an EA block, life gets more tricky */
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if (inode->i_size >= EXT2_N_BLOCKS*4)
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return 1; /* definitely using i_block[] */
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if (inode->i_size > 4 && inode->i_block[1] == 0)
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return 1; /* definitely using i_block[] */
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return 0; /* Probably a fast symlink */
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}
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}
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return 1;
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}
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