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btrfs: allow read-only mount of 4K sector size fs on 64K page system 

This adds the basic RO mount ability for 4K sector size on 64K page
system.

Currently we only plan to support 4K and 64K page system.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-01-26 16:34:02 +08:00 committed by David Sterba
parent 92082d4097
commit 0bb3eb3ee8
2 changed files with 29 additions and 3 deletions
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25
fs/btrfs/disk-io.c
View File

@ -2483,13 +2483,21 @@ static int validate_super(struct btrfs_fs_info *fs_info,
btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
ret = -EINVAL;
}
/* Only PAGE SIZE is supported yet */
if (sectorsize != PAGE_SIZE) {
/*
* For 4K page size, we only support 4K sector size.
* For 64K page size, we support read-write for 64K sector size, and
* read-only for 4K sector size.
*/
if ((PAGE_SIZE == SZ_4K && sectorsize != PAGE_SIZE) ||
(PAGE_SIZE == SZ_64K && (sectorsize != SZ_4K &&
sectorsize != SZ_64K))) {
btrfs_err(fs_info,
"sectorsize %llu not supported yet, only support %lu",
"sectorsize %llu not yet supported for page size %lu",
sectorsize, PAGE_SIZE);
ret = -EINVAL;
}
if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
@ -3248,6 +3256,17 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
goto fail_alloc;
}
/* For 4K sector size support, it's only read-only */
if (PAGE_SIZE == SZ_64K && sectorsize == SZ_4K) {
if (!sb_rdonly(sb) || btrfs_super_log_root(disk_super)) {
btrfs_err(fs_info,
"subpage sectorsize %u only supported read-only for page size %lu",
sectorsize, PAGE_SIZE);
err = -EINVAL;
goto fail_alloc;
}
}
ret = btrfs_init_workqueues(fs_info, fs_devices);
if (ret) {
err = ret;

7
fs/btrfs/super.c
View File

@ -2027,6 +2027,13 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
ret = -EINVAL;
goto restore;
}
if (fs_info->sectorsize < PAGE_SIZE) {
btrfs_warn(fs_info,
"read-write mount is not yet allowed for sectorsize %u page size %lu",
fs_info->sectorsize, PAGE_SIZE);
ret = -EINVAL;
goto restore;
}
/*
* NOTE: when remounting with a change that does writes, don't