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

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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