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V7: Adjust sanity checks for some volumes

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Newly mkfs-ed filesystems from Seventh Edition have last modification
time set to zero, but are otherwise perfectly valid.

Also, tighten up other sanity checks to filter out most filesystems with
different bytesex than we're using.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Lubomir Rintel 2010-07-22 03:11:48 +02:00 • committed by Al Viro
parent b76212d7f1
commit 496ee9b8f3
2 changed files with 15 additions and 2 deletions
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6
fs/sysv/super.c
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@ -469,7 +469,7 @@ static int v7_fill_super(struct super_block *sb, void *data, int silent)
v7sb = (struct v7_super_block *) bh->b_data;
if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE ||
fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD ||
fs32_to_cpu(sbi, v7sb->s_time) == 0)
fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE)
goto failed;
/* plausibility check on root inode: it is a directory,
@ -479,7 +479,9 @@ static int v7_fill_super(struct super_block *sb, void *data, int silent)
v7i = (struct sysv_inode *)(bh2->b_data + 64);
if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR ||
(fs32_to_cpu(sbi, v7i->i_size) == 0) ||
(fs32_to_cpu(sbi, v7i->i_size) & 017) != 0)
(fs32_to_cpu(sbi, v7i->i_size) & 017) ||
(fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES *
sizeof (struct sysv_dir_entry)))
goto failed;
brelse(bh2);
bh2 = NULL;