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nilfs2: reject incompatible filesystem

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This forces nilfs to check compatibility of feature flags so as to
reject a filesystem with unknown features when it mounts or remounts
the filesystem.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-22 03:22:20 +09:00
parent 1a80a1763f
commit c5ca48aabe
3 changed files with 61 additions and 0 deletions
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2
fs/nilfs2/nilfs.h
View File

@ -275,6 +275,8 @@ extern struct nilfs_super_block *
nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
extern int nilfs_store_magic_and_option(struct super_block *,
struct nilfs_super_block *, char *);
extern int nilfs_check_feature_compatibility(struct super_block *,
struct nilfs_super_block *);
extern void nilfs_set_log_cursor(struct nilfs_super_block *,
struct the_nilfs *);
extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *,

39
fs/nilfs2/super.c
View File

@ -790,6 +790,30 @@ int nilfs_store_magic_and_option(struct super_block *sb,
return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
}
int nilfs_check_feature_compatibility(struct super_block *sb,
struct nilfs_super_block *sbp)
{
__u64 features;
features = le64_to_cpu(sbp->s_feature_incompat) &
~NILFS_FEATURE_INCOMPAT_SUPP;
if (features) {
printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
"optional features (%llx)\n",
(unsigned long long)features);
return -EINVAL;
}
features = le64_to_cpu(sbp->s_feature_compat_ro) &
~NILFS_FEATURE_COMPAT_RO_SUPP;
if (!(sb->s_flags & MS_RDONLY) && features) {
printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
"unsupported optional features (%llx)\n",
(unsigned long long)features);
return -EINVAL;
}
return 0;
}
/**
* nilfs_fill_super() - initialize a super block instance
* @sb: super_block
@ -984,11 +1008,26 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data)
nilfs_cleanup_super(sbi);
up_write(&nilfs->ns_sem);
} else {
__u64 features;
/*
* Mounting a RDONLY partition read-write, so reread and
* store the current valid flag. (It may have been changed
* by fsck since we originally mounted the partition.)
*/
down_read(&nilfs->ns_sem);
features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
~NILFS_FEATURE_COMPAT_RO_SUPP;
up_read(&nilfs->ns_sem);
if (features) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
"remount RDWR because of unsupported optional "
"features (%llx)\n",
sb->s_id, (unsigned long long)features);
err = -EROFS;
goto restore_opts;
}
sb->s_flags &= ~MS_RDONLY;
err = nilfs_attach_segment_constructor(sbi);

20
fs/nilfs2/the_nilfs.c
View File

@ -385,11 +385,23 @@ int load_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
goto skip_recovery;
if (s_flags & MS_RDONLY) {
__u64 features;
if (nilfs_test_opt(sbi, NORECOVERY)) {
printk(KERN_INFO "NILFS: norecovery option specified. "
"skipping roll-forward recovery\n");
goto skip_recovery;
}
features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
~NILFS_FEATURE_COMPAT_RO_SUPP;
if (features) {
printk(KERN_ERR "NILFS: couldn't proceed with "
"recovery because of unsupported optional "
"features (%llx)\n",
(unsigned long long)features);
err = -EROFS;
goto failed_unload;
}
if (really_read_only) {
printk(KERN_ERR "NILFS: write access "
"unavailable, cannot proceed.\n");
@ -644,6 +656,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
if (err)
goto out;
err = nilfs_check_feature_compatibility(sb, sbp);
if (err)
goto out;
blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size);
if (sb->s_blocksize != blocksize &&
!sb_set_blocksize(sb, blocksize)) {
@ -669,6 +685,10 @@ int init_nilfs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, char *data)
if (err)
goto failed_sbh;
err = nilfs_check_feature_compatibility(sb, sbp);
if (err)
goto failed_sbh;
blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size);
if (sb->s_blocksize != blocksize) {
int hw_blocksize = bdev_logical_block_size(sb->s_bdev);