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btrfs-progs: add OPEN_CTREE_INVALIDATE_FST flag 

If this flag is passed to open_ctree(), we'll clear the
FREE_SPACE_TREE_VALID compat_ro bit. The kernel will then reconstruct
the free space tree the next time the filesystem is mounted.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Omar Sandoval 2016-11-14 10:43:20 -08:00 committed by David Sterba
parent 9e02fbfcd3
commit 441d8aea8f
3 changed files with 28 additions and 12 deletions
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2
chunk-recover.c
View File

@ -1477,7 +1477,7 @@ open_ctree_with_broken_chunk(struct recover_control *rc)
memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
ret = btrfs_check_fs_compatibility(disk_super, 1);
ret = btrfs_check_fs_compatibility(disk_super, OPEN_CTREE_WRITES);
if (ret)
goto out_devices;

29
disk-io.c
View File

@ -904,7 +904,8 @@ free_all:
return NULL;
}
int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
unsigned int flags)
{
u64 features;
@ -923,13 +924,22 @@ int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
btrfs_set_super_incompat_flags(sb, features);
}
features = btrfs_super_compat_ro_flags(sb) &
~BTRFS_FEATURE_COMPAT_RO_SUPP;
if (writable && features) {
printk("couldn't open RDWR because of unsupported "
"option features (%Lx).\n",
(unsigned long long)features);
return -ENOTSUP;
features = btrfs_super_compat_ro_flags(sb);
if (flags & OPEN_CTREE_WRITES) {
if (flags & OPEN_CTREE_INVALIDATE_FST) {
/* Clear the FREE_SPACE_TREE_VALID bit on disk... */
features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
btrfs_set_super_compat_ro_flags(sb, features);
/* ... and ignore the free space tree bit. */
features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
}
if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
printk("couldn't open RDWR because of unsupported "
"option features (%Lx).\n",
(unsigned long long)features);
return -ENOTSUP;
}
}
return 0;
}
@ -1320,8 +1330,7 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
ret = btrfs_check_fs_compatibility(fs_info->super_copy,
flags & OPEN_CTREE_WRITES);
ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
if (ret)
goto out_devices;

9
disk-io.h
View File

@ -74,6 +74,12 @@ enum btrfs_open_ctree_flags {
/* Allow to open a partially created filesystem */
OPEN_CTREE_FS_PARTIAL = (1U << 12),
/*
* Invalidate the free space tree (i.e., clear the FREE_SPACE_TREE_VALID
* compat_ro bit).
*/
OPEN_CTREE_INVALIDATE_FST = (1U << 13),
};
/*
@ -128,7 +134,8 @@ int clean_tree_block(struct btrfs_trans_handle *trans,
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr);
int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable);
int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
unsigned int flags);
int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
unsigned flags);
void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);