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nilfs2: reject filesystem with unsupported block size 

This inserts sanity check that refuses to mount a filesystem with
unsupported block size.

Previously, kernel code of nilfs was looking only limitation of
devices though mkfs.nilfs2 limits the range of block sizes; there was
no check that prevents rec_len overflow with larger block sizes.

With this change, block sizes larger than 64KB or smaller than 1KB
will get rejected explicitly by kernel.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-25 22:44:53 +09:00
parent 6cda9fa257
commit 89c0fd014d
2 changed files with 14 additions and 1 deletions
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9
fs/nilfs2/the_nilfs.c
View File

@ -671,7 +671,7 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
goto out;
}
blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE);
if (!blocksize) {
printk(KERN_ERR "NILFS: unable to set blocksize\n");
err = -EINVAL;
@ -690,6 +690,13 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
goto failed_sbh;
blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size);
if (blocksize < NILFS_MIN_BLOCK_SIZE ||
blocksize > NILFS_MAX_BLOCK_SIZE) {
printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
"filesystem blocksize %d\n", blocksize);
err = -EINVAL;
goto failed_sbh;
}
if (sb->s_blocksize != blocksize) {
int hw_blocksize = bdev_logical_block_size(sb->s_bdev);

6
include/linux/nilfs2_fs.h
View File

@ -286,6 +286,12 @@ struct nilfs_super_block {
#define NILFS_NAME_LEN 255
/*
* Block size limitations
*/
#define NILFS_MIN_BLOCK_SIZE 1024
#define NILFS_MAX_BLOCK_SIZE 65536
/*
* The new version of the directory entry. Since V0 structures are
* stored in intel byte order, and the name_len field could never be