Last change
on this file since 1936 was 1765, checked in by Bruno Cornec, 17 years ago |
Update to busybox 1.7.2
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-
Property svn:eol-style
set to
native
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File size:
1.3 KB
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Rev | Line | |
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[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * valid_blk.c --- does the inode have valid blocks?
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| 4 | *
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| 5 | * Copyright 1997 by Theodore Ts'o
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| 6 | *
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| 7 | * %Begin-Header%
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| 8 | * This file may be redistributed under the terms of the GNU Public
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| 9 | * License.
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| 10 | * %End-Header%
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| 11 | *
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| 12 | */
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| 13 |
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| 14 | #include <stdio.h>
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| 15 | #if HAVE_UNISTD_H
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| 16 | #include <unistd.h>
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| 17 | #endif
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| 18 | #include <string.h>
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| 19 | #include <time.h>
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| 20 |
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| 21 | #include "ext2_fs.h"
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| 22 | #include "ext2fs.h"
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| 23 |
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| 24 | /*
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| 25 | * This function returns 1 if the inode's block entries actually
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| 26 | * contain block entries.
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| 27 | */
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| 28 | int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
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| 29 | {
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| 30 | /*
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| 31 | * Only directories, regular files, and some symbolic links
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| 32 | * have valid block entries.
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| 33 | */
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| 34 | if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) &&
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| 35 | !LINUX_S_ISLNK(inode->i_mode))
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| 36 | return 0;
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| 37 |
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| 38 | /*
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| 39 | * If the symbolic link is a "fast symlink", then the symlink
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| 40 | * target is stored in the block entries.
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| 41 | */
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| 42 | if (LINUX_S_ISLNK (inode->i_mode)) {
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| 43 | if (inode->i_file_acl == 0) {
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| 44 | /* With no EA block, we can rely on i_blocks */
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| 45 | if (inode->i_blocks == 0)
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| 46 | return 0;
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| 47 | } else {
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| 48 | /* With an EA block, life gets more tricky */
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| 49 | if (inode->i_size >= EXT2_N_BLOCKS*4)
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| 50 | return 1; /* definitely using i_block[] */
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| 51 | if (inode->i_size > 4 && inode->i_block[1] == 0)
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| 52 | return 1; /* definitely using i_block[] */
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| 53 | return 0; /* Probably a fast symlink */
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| 54 | }
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| 55 | }
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| 56 | return 1;
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| 57 | }
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