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Message-Id: <FECC22CA-3112-4C4F-ABE6-9609753559B7@dilger.ca>
Date: Tue, 5 Dec 2017 14:26:58 -0700
From: Andreas Dilger <adilger@...ger.ca>
To: Artem Blagodarenko <artem.blagodarenko@...il.com>
Cc: linux-ext4 <linux-ext4@...r.kernel.org>,
Artem Blagodarenko <artem.blagodarenko@...gle.com>
Subject: Re: [PATCH v3 3/3] ext4: Add 64-bit inode number support
On Nov 30, 2017, at 8:17 AM, Artem Blagodarenko <artem.blagodarenko@...il.com> wrote:
>
> Use dirdata to store high bits of 64bit inode
> number.
>
> Signed-off-by: Artem Blagodarenko <artem.blagodarenko@...gle.com>
> ---
> fs/ext4/dir.c | 4 +--
> fs/ext4/ext4.h | 85 ++++++++++++++++++++++++++++++++++++++++++++++----------
> fs/ext4/ialloc.c | 19 ++++++++-----
> fs/ext4/inode.c | 5 ++++
> fs/ext4/namei.c | 53 ++++++++++++++++++++++++++++-------
> fs/ext4/resize.c | 8 +++---
> fs/ext4/super.c | 14 +++++++---
> 7 files changed, 147 insertions(+), 41 deletions(-)
>
> diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
> index 0c4dddb0f07a..d971bc68903c 100644
> --- a/fs/ext4/dir.c
> +++ b/fs/ext4/dir.c
> @@ -76,7 +76,7 @@ int __ext4_check_dir_entry(const char *function, unsigned int line,
> else if (unlikely(((char *) de - buf) + rlen > size))
> error_msg = "directory entry across range";
> else if (unlikely(le32_to_cpu(de->inode) >
> - le32_to_cpu(EXT4_SB(dir->i_sb)->s_es->s_inodes_count)))
> + ext4_get_inodes_count(dir->i_sb)))
> @@ -382,7 +382,7 @@ struct fname {
> __u32 minor_hash;
> struct rb_node rb_hash;
> struct fname *next;
> - __u32 inode;
> + __u64 inode;
> __u8 name_len;
> __u8 file_type;
> char name[0];
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 3678657d8e47..18e30589b704 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1331,7 +1331,10 @@ struct ext4_super_block {
> __le32 s_lpf_ino; /* Location of the lost+found inode */
> __le32 s_prj_quota_inum; /* inode for tracking project quota */
> __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
> - __le32 s_reserved[98]; /* Padding to the end of the block */
> + __le32 s_inodes_count_hi; /* higth part of inode count */
> + __le32 s_free_inodes_count_hi; /* Free inodes count */
> + __le32 s_prj_quota_inum_hi; /* high part of project quota inode */
> + __le32 s_reserved[95]; /* Padding to the end of the block */
What about s_last_orphan, s_first_error_ino, and s_last_error_ino?
> __le32 s_checksum; /* crc32c(superblock) */
> };
>
> @@ -1539,18 +1542,6 @@ static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
> return container_of(inode, struct ext4_inode_info, vfs_inode);
> }
>
> -static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
> -{
> - return ino == EXT4_ROOT_INO ||
> - ino == EXT4_USR_QUOTA_INO ||
> - ino == EXT4_GRP_QUOTA_INO ||
> - ino == EXT4_BOOT_LOADER_INO ||
> - ino == EXT4_JOURNAL_INO ||
> - ino == EXT4_RESIZE_INO ||
> - (ino >= EXT4_FIRST_INO(sb) &&
> - ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
> -}
> -
> /*
> * Inode dynamic state flags
> */
> @@ -1689,6 +1680,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
> #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
> #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
> #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
> +#define EXT4_FEATURE_INCOMPAT_INODE64 0x20000
>
> #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
> static inline bool ext4_has_feature_##name(struct super_block *sb) \
> @@ -1777,6 +1769,8 @@ EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
> EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
> EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
> EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
> +EXT4_FEATURE_INCOMPAT_FUNCS(inode64, INODE64)
> +
>
> #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
> #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
> @@ -1805,6 +1799,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
> EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
> EXT4_FEATURE_INCOMPAT_ENCRYPT | \
> EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
> + EXT4_FEATURE_INCOMPAT_INODE64 | \
> EXT4_FEATURE_INCOMPAT_LARGEDIR | \
> EXT4_FEATURE_INCOMPAT_DIRDATA)
> #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
> @@ -2000,6 +1995,11 @@ struct ext4_dirent_lufid {
> __u8 dl_data[0];
> } __packed;
>
> +struct ext4_dirent_inohi {
> + struct ext4_dirent_data_header di_header; /* 1 + 4 */
> + __le32 di_inohi;
> +} __packed;
It would be better to keep the struct name "ext4_dirent_inode64" to match
the feature name?
I also notice that you need to update "s_inode_goal" to be "unsigned long",
so that you can easily test inode allocations beyond 2^32. You also need
to fix the ext4_ext_migrate() function to have a __u64 goal.
There is an interaction with the xattr_inode feature that needs to be fixed.
The e_value_inum field is only a __u32, and there doesn't appear to be any
space to hold the high 32 bits of the inode number therein. One option (not
sure what you think of this) is to always use the same __u32 i_ino_hi for the
xattr inode as for the regular inode that references it? That is OK for
unshared xattrs, and for shared inodes it would mean one shared inode per 2^32
inodes by changing ext4_xattr_inode_cache_find() to only find an existing cached
entry if they have the same high 32 bits in the inode number.
There also looks to be some interaction with inline.c::htree_inlinedir_to_tree()
storing the inode number into the "fake" dirent, but it isn't handling 64-bit
inodes. Similarly, ext4_try_create_inline_dir() and ext4_add_dirent_to_inline()
need some attention.
> @@ -2476,7 +2476,7 @@ extern int ext4fs_dirhash(const char *name, int len, struct
>
> /* ialloc.c */
> extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
> - const struct qstr *qstr, __u32 goal,
> + const struct qstr *qstr, __u64 goal,
> uid_t *owner, __u32 i_flags,
> int handle_type, unsigned int line_no,
> int nblocks);
> @@ -2903,6 +2903,63 @@ static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
> return 1 << sbi->s_log_groups_per_flex;
> }
>
> +static inline unsigned long ext4_get_inodes_count(struct super_block *sb)
> +{
> + struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> + unsigned long inodes_count = le32_to_cpu(es->s_inodes_count);
> +
> + if (ext4_has_feature_inode64(sb))
> + inodes_count |=
> + (unsigned long)le32_to_cpu(es->s_inodes_count_hi)
> + << 32;
> + return inodes_count;
> +}
> +
> +static inline void ext4_set_inodes_count(struct super_block *sb,
> + unsigned long val)
> +{
> + struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> +
> + if (ext4_has_feature_inode64(sb))
> + es->s_inodes_count_hi = cpu_to_le32(val >> 32);
> +
> + es->s_inodes_count = cpu_to_le32(val);
> +}
> +
> +static inline unsigned long ext4_get_free_inodes_count(struct super_block *sb)
> +{
> + struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> + unsigned long inodes_count = le32_to_cpu(es->s_free_inodes_count);
> +
> + if (ext4_has_feature_inode64(sb))
> + inodes_count |=
> + (unsigned long)le32_to_cpu(es->s_free_inodes_count_hi)
> + << 32;
> + return inodes_count;
> +}
> +
> +static inline void ext4_set_free_inodes_count(struct super_block *sb,
> + unsigned long val)
> +{
> + struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> +
> + if (ext4_has_feature_inode64(sb))
> + es->s_free_inodes_count_hi = cpu_to_le32(val >> 32);
> +
> + es->s_free_inodes_count = cpu_to_le32(val);
> +}
> +
> +static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
> +{
> + return ino == EXT4_ROOT_INO ||
> + ino == EXT4_USR_QUOTA_INO ||
> + ino == EXT4_GRP_QUOTA_INO ||
> + ino == EXT4_JOURNAL_INO ||
> + ino == EXT4_RESIZE_INO ||
> + (ino >= EXT4_FIRST_INO(sb) &&
> + ino <= ext4_get_inodes_count(sb));
> +}
> +
> #define ext4_std_error(sb, errno) \
> do { \
> if ((errno)) \
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index ee823022aa34..e23dc4133e84 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -303,7 +303,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
> ext4_clear_inode(inode);
>
> es = EXT4_SB(sb)->s_es;
> - if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
> + if (ino < EXT4_FIRST_INO(sb) || ino > ext4_get_inodes_count(sb)) {
> ext4_error(sb, "reserved or nonexistent inode %lu", ino);
> goto error_return;
> }
> @@ -770,7 +770,7 @@ static int find_inode_bit(struct super_block *sb, ext4_group_t group,
> */
> struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> umode_t mode, const struct qstr *qstr,
> - __u32 goal, uid_t *owner, __u32 i_flags,
> + __u64 goal, uid_t *owner, __u32 i_flags,
> int handle_type, unsigned int line_no,
> int nblocks)
> {
> @@ -887,7 +887,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> if (!goal)
> goal = sbi->s_inode_goal;
>
> - if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) {
> + if (goal && goal <= ext4_get_inodes_count(sb)) {
> group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
> ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
> ret2 = 0;
> @@ -1149,6 +1149,11 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> __le32 gen = cpu_to_le32(inode->i_generation);
> csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
> sizeof(inum));
> + if (inode->i_ino >> 32) {
> + inum = cpu_to_le32(inode->i_ino >> 32);
> + csum = ext4_chksum(sbi, sbi->s_csum_seed,
> + (__u8 *)&inum, sizeof(inum));
> + }
> ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
> sizeof(gen));
> }
> @@ -1226,7 +1231,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
> /* Verify that we are loading a valid orphan from disk */
> struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
> {
> - unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
> + unsigned long max_ino = ext4_get_inodes_count(sb);
> ext4_group_t block_group;
> int bit;
> struct buffer_head *bitmap_bh = NULL;
> @@ -1330,9 +1335,9 @@ unsigned long ext4_count_free_inodes(struct super_block *sb)
> bitmap_count += x;
> }
> brelse(bitmap_bh);
> - printk(KERN_DEBUG "ext4_count_free_inodes: "
> - "stored = %u, computed = %lu, %lu\n",
> - le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
> + printk(KERN_DEBUG "ext4_count_free_inodes:\n"
This should be kept on a single line.
> + "stored = %lu, computed = %lu, %lu\n",
> + ext4_get_inodes_count(sb), desc_count, bitmap_count);
> return desc_count;
> #else
> desc_count = 0;
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 31db875bc7a1..9caefee1bce9 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4691,6 +4691,11 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
> __le32 gen = raw_inode->i_generation;
> csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
> sizeof(inum));
> + if (inode->i_ino >> 32) {
> + inum = cpu_to_le32(inode->i_ino >> 32);
> + csum = ext4_chksum(sbi, sbi->s_csum_seed,
> + (__u8 *)&inum, sizeof(inum));
> + }
> ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
> sizeof(gen));
> }
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 67edab5572d8..0ef33556c51d 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1573,11 +1573,45 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
> return (struct dentry *) bh;
> inode = NULL;
> if (bh) {
> - __u32 ino = le32_to_cpu(de->inode);
> + unsigned long ino;
> +
> + ino = le32_to_cpu(de->inode);
> + if (ext4_has_feature_inode64(dir->i_sb) &&
> + (de->file_type & EXT4_DIRENT_INODE)) {
> + struct ext4_dirent_data_header *ddh =
> + (struct ext4_dirent_data_header *)
> + &de->name[de->name_len];
This should always skip the NUL separator after the name, and not make it
part of EXT4_DIRENT_LUFID:
struct ext4_dirent_data_header *ddh =
(struct ext4_dirent_data_header *)
(&de->name[de->name_len] + 1);
Otherwise, it isn't clear whether EXT4_DIRENT_INODE64 handling should
skip the NUL byte if there is no EXT4_DIRENT_LUFID record.
Should we also be checking "if ((char *)ddh > &de->name[de->rec_len])" here?
> +
> + if (de->file_type & EXT4_DIRENT_LUFID) {
> + /* skip LUFID record if present */
> + ddh = (struct ext4_dirent_data_header *)
> + &de->name[de->name_len + 1 +
> + ddh->ddh_length];
Having a "ext4_dirdata_next()" helper would be convenient here, or at least
avoid recomputing the offset:
ddh = (struct ext4_dirent_data_header *)
((char *)ddh + ddh->ddh_length);
> + }
> +
> + if ((char *)ddh > &de->name[de->rec_len]) {
> + EXT4_ERROR_INODE(dir,
> + "corrupted dirdata entry\n");
> + return ERR_PTR(-EFSCORRUPTED);
> + }
> +
> + if (ddh->ddh_length == (sizeof(__u32) + 1)) {
(defect) this should check for EXT4_DIRENT_INODE64 before checking the size,
otherwise this would accidentally catch 1/256 inodes that happen to have "05"
in the low byte.
> + __le32 ino_hi;
> + struct ext4_dirent_lufid *dlf =
> + (struct ext4_dirent_lufid *)ddh;
(defect) this should be struct ext4_dirent_inohi *di?
> +
> + memcpy(&ino_hi, dlf->dl_data, sizeof(__u32));
Then here it would be:
memcpy(&ino_hi, di->di_inohi, sizeof(ino_hi));
> + ino |= (__u64)le32_to_cpu(ino_hi) << 32;
> + } else {
> + EXT4_ERROR_INODE(dir,
> + "corrupted dirdata inode number\n");
> + return ERR_PTR(-EFSCORRUPTED);
> + }
> + }
I also saw that ext4_rename_dir_prepare(), ext4_rename_dir_finish(),
ext4_rename_delete(), ext4_cross_rename(), ext4_empty_dir(), ext4_rmdir(),
ext4_rename(), ext4_unlink(), and ext4_setent() need to be updated to
handle 64-bit inodes, since they are comparing i_ino to de->inode when
handling the directory entry. It looks like it would be useful to have
a helper function like ext4_dirent_ino(de) that extracts the 64-bit inode
from the dirent, which could be used in ext4_lookup() (it would be the whole
block of code added above that is checking for ext4_has_feature_inode64()).
It makes sense to add the ext4_dirent_ino() and ext4_{get,set}_inodes_count()
helper functions in a preliminary patch (with only 32-bit inodes) and then
add the code handling 64-bit inodes in a second patch? That would move all
the boring changes out of this patch, so it can focus on the important changes.
> @@ -1588,7 +1622,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
> inode = ext4_iget_normal(dir->i_sb, ino);
> if (inode == ERR_PTR(-ESTALE)) {
> EXT4_ERROR_INODE(dir,
> - "deleted inode referenced: %u",
> + "deleted inode referenced: %lu",
> ino);
> return ERR_PTR(-EFSCORRUPTED);
> }
> @@ -1892,7 +1926,7 @@ static int add_dirent_to_buf(handle_t *handle,
> unsigned int blocksize = dir->i_sb->s_blocksize;
> int csum_size = 0;
> unsigned short reclen, dotdot_reclen = 0;
> - int err, dlen = 0;
> + int err, dlen = 0, data_offset = 0;
> bool is_dotdot = false, write_short_dotdot = false;
> struct ext4_dirent_data_header *ddh;
> int namelen = dentry->d_name.len;
> @@ -1944,13 +1978,12 @@ static int add_dirent_to_buf(handle_t *handle,
> }
>
> if (inode) {
> - __u32 *i_ino_hi;
> -
> - de->name[namelen + 1 + data_offset] = 5;
> - i_ino_hi = (__u32 *)&de->name[namelen + 1 + data_offset + 1];
> - *i_ino_hi = cpu_to_le32((__u32)(inode->i_ino >> 32));
> - de->file_type |= EXT4_DIRENT_INODE;
> + struct ext4_dirent_inohi *di = (struct ext4_dirent_inohi *)
> + &de->name[namelen + 1 + data_offset];
> + di->di_header.ddh_length = sizeof(*di);
> + di->di_inohi = cpu_to_le32(inode->i_ino >> 32);
> de->inode = cpu_to_le32(inode->i_ino & 0xFFFFFFFF);
> + de->file_type |= EXT4_DIRENT_INODE;
> }
Since "i_ino_hi" may not be 4-byte aligned, using it directly as a pointer
may cause problems on some architectures. This should instead use memcpy()
like above:
struct ext4_dirent_inohi {
struct ext4_dirent_data_header di_header; /* 1 + 4 */
__le32 di_inohi;
} __packed;
if (inode) {
struct ext4_dirent_inohi *di;
__u32 i_ino_hi;
i_ino_hi = cpu_to_le32((__u32)(inode->i_ino >> 32));
di = (void *)&de->name[namelen + 1 + data_offset];
di->di_header.ddh_length = sizeof(*di);
memcpy(di->di_inohi, &i_ino_hi, sizeof(i_ino_hi));
> + de->file_type |= EXT4_DIRENT_INODE;
> + de->inode = cpu_to_le32(inode->i_ino & 0xFFFFFFFF);
Setting "de->inode" isn't needed, it was set in ext4_insert_dentry() above.
For consistency, this should also increment data_offset so it will be
correct if/when the next dirdata field is added.
data_offset += di->di_header.ddh_length;
}
> diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> index 035cd3f4785e..d0d5acd1a70d 100644
> --- a/fs/ext4/resize.c
> +++ b/fs/ext4/resize.c
> @@ -1337,10 +1337,10 @@ static void ext4_update_super(struct super_block *sb,
>
> ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
> ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
> - le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
> - flex_gd->count);
> - le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
> - flex_gd->count);
> + ext4_set_inodes_count(sb, ext4_get_inodes_count(sb) +
> + EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
> + ext4_set_free_inodes_count(sb, ext4_get_free_inodes_count(sb) +
> + EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
>
> ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
> /*
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index ead9406d9cff..a06252f9aada 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3489,6 +3489,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> goto cantfind_ext4;
> }
>
> + if (ext4_has_feature_inode64(sb) &&
> + (sizeof(u64) != sizeof(unsigned long))) {
> + ext4_msg(sb, KERN_ERR, "64 bit inodes need 64 bit kernel.");
"64-bit"
> + goto failed_mount;
> + }
> +
> /* Load the checksum driver */
> if (ext4_has_feature_metadata_csum(sb) ||
> ext4_has_feature_ea_inode(sb)) {
> @@ -4248,7 +4254,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> GFP_KERNEL);
> if (!err) {
> unsigned long freei = ext4_count_free_inodes(sb);
> - sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
> + ext4_set_free_inodes_count(sb, freei);
> err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
> GFP_KERNEL);
> }
> @@ -4705,9 +4711,9 @@ static int ext4_commit_super(struct super_block *sb, int sync)
> EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
> &EXT4_SB(sb)->s_freeclusters_counter)));
> if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
> - es->s_free_inodes_count =
> - cpu_to_le32(percpu_counter_sum_positive(
> - &EXT4_SB(sb)->s_freeinodes_counter));
> + ext4_set_free_inodes_count(sb,
> + cpu_to_le32(percpu_counter_sum_positive(
> + &EXT4_SB(sb)->s_freeinodes_counter)));
> BUFFER_TRACE(sbh, "marking dirty");
> ext4_superblock_csum_set(sb);
> if (sync)
> --
> 2.13.6 (Apple Git-96)
>
Cheers, Andreas
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