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| author | Baokun Li <libaokun1@huawei.com> | 2025-11-21 17:06:54 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2025-11-28 22:35:28 -0500 |
| commit | cab8cbcb923a89cb583c9088fa50431eb2feded5 (patch) | |
| tree | 2725cd3381f99aca1f0114898bbdbc2f88564a7e | |
| parent | 709f0f1f1bf5ca62a000084e5446ca6b57c8678c (diff) | |
ext4: enable block size larger than page size
Since block device (See commit 3c20917120ce ("block/bdev: enable large
folio support for large logical block sizes")) and page cache (See commit
ab95d23bab220ef8 ("filemap: allocate mapping_min_order folios in the page
cache")) has the ability to have a minimum order when allocating folio,
and ext4 has supported large folio in commit 7ac67301e82f ("ext4: enable
large folio for regular file"), now add support for block_size > PAGE_SIZE
in ext4.
set_blocksize() -> bdev_validate_blocksize() already validates the block
size, so ext4_load_super() does not need to perform additional checks.
Here we only need to add the FS_LBS bit to fs_flags.
In addition, block sizes larger than the page size are currently supported
only when CONFIG_TRANSPARENT_HUGEPAGE is enabled. To make this explicit,
a blocksize_gt_pagesize entry has been added under /sys/fs/ext4/feature/,
indicating whether bs > ps is supported. This allows mke2fs to check the
interface and determine whether a warning should be issued when formatting
a filesystem with block size larger than the page size.
Suggested-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Message-ID: <20251121090654.631996-25-libaokun@huaweicloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/super.c | 3 | ||||
| -rw-r--r-- | fs/ext4/sysfs.c | 6 |
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 3d03a6eb0ea0..87205660c5d0 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -7453,7 +7453,8 @@ static struct file_system_type ext4_fs_type = { .init_fs_context = ext4_init_fs_context, .parameters = ext4_param_specs, .kill_sb = ext4_kill_sb, - .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_MGTIME | + FS_LBS, }; MODULE_ALIAS_FS("ext4"); diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index 987bd00f916a..0018e09b867e 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -332,6 +332,9 @@ EXT4_ATTR_FEATURE(fast_commit); #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) EXT4_ATTR_FEATURE(encrypted_casefold); #endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +EXT4_ATTR_FEATURE(blocksize_gt_pagesize); +#endif static struct attribute *ext4_feat_attrs[] = { ATTR_LIST(lazy_itable_init), @@ -352,6 +355,9 @@ static struct attribute *ext4_feat_attrs[] = { #if IS_ENABLED(CONFIG_UNICODE) && defined(CONFIG_FS_ENCRYPTION) ATTR_LIST(encrypted_casefold), #endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + ATTR_LIST(blocksize_gt_pagesize), +#endif NULL, }; ATTRIBUTE_GROUPS(ext4_feat); |