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Message-ID: <20210630155438.GD13743@locust>
Date: Wed, 30 Jun 2021 08:54:38 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: Jan Kara <jack@...e.cz>
Cc: Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/4] ext4: Speedup ext4 orphan inode handling
On Wed, Jun 16, 2021 at 12:56:54PM +0200, Jan Kara wrote:
> Ext4 orphan inode handling is a bottleneck for workloads which heavily
> truncate / unlink small files since it contends on the global
> s_orphan_mutex lock (and generally it's difficult to improve scalability
> of the ondisk linked list of orphaned inodes).
>
> This patch implements new way of handling orphan inodes. Instead of
> linking orphaned inode into a linked list, we store it's inode number in
> a new special file which we call "orphan file". Currently we still
> protect the orphan file with a spinlock for simplicity but even in this
> setting we can substantially reduce the length of the critical section
> and thus speedup some workloads.
>
> Note that the change is backwards compatible when the filesystem is
> clean - the existence of the orphan file is a compat feature, we set
> another ro-compat feature indicating orphan file needs scanning for
> orphaned inodes when mounting filesystem read-write. This ro-compat
> feature gets cleared on unmount / remount read-only.
>
> Some performance data from 80 CPU Xeon Server with 512 GB of RAM,
> filesystem located on SSD, average of 5 runs:
>
> stress-orphan (microbenchmark truncating files byte-by-byte from N
> processes in parallel)
>
> Threads Time Time
> Vanilla Patched
> 1 1.057200 0.945600
> 2 1.680400 1.331800
> 4 2.547000 1.995000
> 8 7.049400 6.424200
> 16 14.827800 14.937600
> 32 40.948200 33.038200
> 64 87.787400 60.823600
> 128 206.504000 122.941400
>
> So we can see significant wins all over the board.
>
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> fs/ext4/ext4.h | 70 +++++++++--
> fs/ext4/orphan.c | 319 ++++++++++++++++++++++++++++++++++++++++++-----
> fs/ext4/super.c | 34 ++++-
> 3 files changed, 379 insertions(+), 44 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 33508487516f..83298c0b6dae 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1025,7 +1025,14 @@ struct ext4_inode_info {
> */
> struct rw_semaphore xattr_sem;
>
> - struct list_head i_orphan; /* unlinked but open inodes */
> + /*
> + * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
> + * i_orphan is used.
> + */
> + union {
> + struct list_head i_orphan; /* unlinked but open inodes */
> + unsigned int i_orphan_idx; /* Index in orphan file */
> + };
>
> /* Fast commit related info */
>
> @@ -1419,7 +1426,8 @@ struct ext4_super_block {
> __u8 s_last_error_errcode;
> __le16 s_encoding; /* Filename charset encoding */
> __le16 s_encoding_flags; /* Filename charset encoding flags */
> - __le32 s_reserved[95]; /* Padding to the end of the block */
> + __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
> + __le32 s_reserved[94]; /* Padding to the end of the block */
> __le32 s_checksum; /* crc32c(superblock) */
> };
>
> @@ -1440,6 +1448,7 @@ struct ext4_super_block {
>
> /* Types of ext4 journal triggers */
> enum ext4_journal_trigger_type {
> + EXT4_JTR_ORPHAN_FILE,
> EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
> };
>
> @@ -1456,6 +1465,36 @@ static inline struct ext4_journal_trigger *EXT4_TRIGGER(
> return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
> }
>
> +#define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
> +
> +/* Structure at the tail of orphan block */
> +struct ext4_orphan_block_tail {
> + __le32 ob_magic;
> + __le32 ob_checksum;
> +};
Can you add the ondisk format changes to the appropriate place in
Documentation/filesystems/ext4/ please?
--D
> +
> +static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
> +{
> + return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
> + sizeof(u32);
> +}
> +
> +struct ext4_orphan_block {
> + int ob_free_entries; /* Number of free orphan entries in block */
> + struct buffer_head *ob_bh; /* Buffer for orphan block */
> +};
> +
> +/*
> + * Info about orphan file.
> + */
> +struct ext4_orphan_info {
> + spinlock_t of_lock;
> + int of_blocks; /* Number of orphan blocks in a file */
> + __u32 of_csum_seed; /* Checksum seed for orphan file */
> + struct ext4_orphan_block *of_binfo; /* Array with info about orphan
> + * file blocks */
> +};
> +
> /*
> * fourth extended-fs super-block data in memory
> */
> @@ -1509,9 +1548,11 @@ struct ext4_sb_info {
>
> /* Journaling */
> struct journal_s *s_journal;
> - struct list_head s_orphan;
> - struct mutex s_orphan_lock;
> unsigned long s_ext4_flags; /* Ext4 superblock flags */
> + struct mutex s_orphan_lock; /* Protects on disk list changes */
> + struct list_head s_orphan; /* List of orphaned inodes in on disk
> + list */
> + struct ext4_orphan_info s_orphan_info;
> unsigned long s_commit_interval;
> u32 s_max_batch_time;
> u32 s_min_batch_time;
> @@ -1846,6 +1887,7 @@ enum {
> EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
> EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
> EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
> + EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
> };
>
> #define EXT4_INODE_BIT_FNS(name, field, offset) \
> @@ -1947,6 +1989,7 @@ static inline bool ext4_verity_in_progress(struct inode *inode)
> */
> #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
> #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
> +#define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
>
> #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
> #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
> @@ -1955,6 +1998,8 @@ static inline bool ext4_verity_in_progress(struct inode *inode)
> #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
> #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
> #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
> +#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x0080 /* Orphan file may be
> + non-empty */
> #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
> #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
> /*
> @@ -1964,6 +2009,7 @@ static inline bool ext4_verity_in_progress(struct inode *inode)
> * GDT_CSUM bits are mutually exclusive.
> */
> #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
> +/* 0x0800 Reserved for EXT4_FEATURE_RO_COMPAT_REPLICA */
> #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
> #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
> #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
> @@ -2050,6 +2096,7 @@ EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
> EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
> EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
> EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
> +EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
>
> EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
> EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
> @@ -2064,6 +2111,7 @@ EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
> EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
> EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
> EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
> +EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
>
> EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
> EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
> @@ -2097,7 +2145,8 @@ EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
> EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
> EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
>
> -#define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
> +#define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
> + EXT4_FEATURE_COMPAT_ORPHAN_FILE)
> #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
> EXT4_FEATURE_INCOMPAT_RECOVER| \
> EXT4_FEATURE_INCOMPAT_META_BG| \
> @@ -2122,7 +2171,8 @@ EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
> EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
> EXT4_FEATURE_RO_COMPAT_QUOTA |\
> EXT4_FEATURE_RO_COMPAT_PROJECT |\
> - EXT4_FEATURE_RO_COMPAT_VERITY)
> + EXT4_FEATURE_RO_COMPAT_VERITY |\
> + EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
>
> #define EXTN_FEATURE_FUNCS(ver) \
> static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
> @@ -2172,7 +2222,6 @@ static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
> return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
> }
>
> -
> /*
> * Default values for user and/or group using reserved blocks
> */
> @@ -3751,6 +3800,13 @@ extern int ext4_orphan_add(handle_t *, struct inode *);
> extern int ext4_orphan_del(handle_t *, struct inode *);
> extern void ext4_orphan_cleanup(struct super_block *sb,
> struct ext4_super_block *es);
> +extern void ext4_release_orphan_info(struct super_block *sb);
> +extern int ext4_init_orphan_info(struct super_block *sb);
> +extern int ext4_orphan_file_empty(struct super_block *sb);
> +extern void ext4_orphan_file_block_trigger(
> + struct jbd2_buffer_trigger_type *triggers,
> + struct buffer_head *bh,
> + void *data, size_t size);
>
> /*
> * Add new method to test whether block and inode bitmaps are properly
> diff --git a/fs/ext4/orphan.c b/fs/ext4/orphan.c
> index 732b16ef655b..ac22667b7fd5 100644
> --- a/fs/ext4/orphan.c
> +++ b/fs/ext4/orphan.c
> @@ -8,6 +8,52 @@
> #include "ext4.h"
> #include "ext4_jbd2.h"
>
> +static int ext4_orphan_file_add(handle_t *handle, struct inode *inode)
> +{
> + int i, j;
> + struct ext4_orphan_info *oi = &EXT4_SB(inode->i_sb)->s_orphan_info;
> + int ret = 0;
> + __le32 *bdata;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(inode->i_sb);
> +
> + spin_lock(&oi->of_lock);
> + for (i = 0; i < oi->of_blocks && !oi->of_binfo[i].ob_free_entries; i++);
> + if (i == oi->of_blocks) {
> + spin_unlock(&oi->of_lock);
> + /*
> + * For now we don't grow or shrink orphan file. We just use
> + * whatever was allocated at mke2fs time. The additional
> + * credits we would have to reserve for each orphan inode
> + * operation just don't seem worth it.
> + */
> + return -ENOSPC;
> + }
> + oi->of_binfo[i].ob_free_entries--;
> + spin_unlock(&oi->of_lock);
> +
> + /*
> + * Get access to orphan block. We have dropped of_lock but since we
> + * have decremented number of free entries we are guaranteed free entry
> + * in our block.
> + */
> + ret = ext4_journal_get_write_access(handle, inode->i_sb,
> + oi->of_binfo[i].ob_bh, EXT4_JTR_ORPHAN_FILE);
> + if (ret)
> + return ret;
> +
> + bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
> + spin_lock(&oi->of_lock);
> + /* Find empty slot in a block */
> + for (j = 0; j < inodes_per_ob && bdata[j]; j++);
> + BUG_ON(j == inodes_per_ob);
> + bdata[j] = cpu_to_le32(inode->i_ino);
> + EXT4_I(inode)->i_orphan_idx = i * inodes_per_ob + j;
> + ext4_set_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
> + spin_unlock(&oi->of_lock);
> +
> + return ext4_handle_dirty_metadata(handle, NULL, oi->of_binfo[i].ob_bh);
> +}
> +
> /*
> * ext4_orphan_add() links an unlinked or truncated inode into a list of
> * such inodes, starting at the superblock, in case we crash before the
> @@ -34,10 +80,10 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
> WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
> !inode_is_locked(inode));
> /*
> - * Exit early if inode already is on orphan list. This is a big speedup
> - * since we don't have to contend on the global s_orphan_lock.
> + * Inode orphaned in orphan file or in orphan list?
> */
> - if (!list_empty(&EXT4_I(inode)->i_orphan))
> + if (ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE) ||
> + !list_empty(&EXT4_I(inode)->i_orphan))
> return 0;
>
> /*
> @@ -49,6 +95,16 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
> ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
> S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
>
> + if (sbi->s_orphan_info.of_blocks) {
> + err = ext4_orphan_file_add(handle, inode);
> + /*
> + * Fallback to normal orphan list of orphan file is
> + * out of space
> + */
> + if (err != -ENOSPC)
> + return err;
> + }
> +
> BUFFER_TRACE(sbi->s_sbh, "get_write_access");
> err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh,
> EXT4_JTR_NONE);
> @@ -103,6 +159,37 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
> return err;
> }
>
> +static int ext4_orphan_file_del(handle_t *handle, struct inode *inode)
> +{
> + struct ext4_orphan_info *oi = &EXT4_SB(inode->i_sb)->s_orphan_info;
> + __le32 *bdata;
> + int blk, off;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(inode->i_sb);
> + int ret = 0;
> +
> + if (!handle)
> + goto out;
> + blk = EXT4_I(inode)->i_orphan_idx / inodes_per_ob;
> + off = EXT4_I(inode)->i_orphan_idx % inodes_per_ob;
> +
> + ret = ext4_journal_get_write_access(handle, inode->i_sb,
> + oi->of_binfo[blk].ob_bh, EXT4_JTR_ORPHAN_FILE);
> + if (ret)
> + goto out;
> +
> + bdata = (__le32 *)(oi->of_binfo[blk].ob_bh->b_data);
> + spin_lock(&oi->of_lock);
> + bdata[off] = 0;
> + oi->of_binfo[blk].ob_free_entries++;
> + spin_unlock(&oi->of_lock);
> + ret = ext4_handle_dirty_metadata(handle, NULL, oi->of_binfo[blk].ob_bh);
> +out:
> + ext4_clear_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
> + INIT_LIST_HEAD(&EXT4_I(inode)->i_orphan);
> +
> + return ret;
> +}
> +
> /*
> * ext4_orphan_del() removes an unlinked or truncated inode from the list
> * of such inodes stored on disk, because it is finally being cleaned up.
> @@ -121,6 +208,9 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
>
> WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
> !inode_is_locked(inode));
> + if (ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE))
> + return ext4_orphan_file_del(handle, inode);
> +
> /* Do this quick check before taking global s_orphan_lock. */
> if (list_empty(&ei->i_orphan))
> return 0;
> @@ -196,6 +286,39 @@ static int ext4_quota_on_mount(struct super_block *sb, int type)
> EXT4_SB(sb)->s_jquota_fmt, type);
> }
>
> +static void ext4_process_orphan(struct inode *inode,
> + int *nr_truncates, int *nr_orphans)
> +{
> + struct super_block *sb = inode->i_sb;
> + int ret;
> +
> + dquot_initialize(inode);
> + if (inode->i_nlink) {
> + if (test_opt(sb, DEBUG))
> + ext4_msg(sb, KERN_DEBUG,
> + "%s: truncating inode %lu to %lld bytes",
> + __func__, inode->i_ino, inode->i_size);
> + jbd_debug(2, "truncating inode %lu to %lld bytes\n",
> + inode->i_ino, inode->i_size);
> + inode_lock(inode);
> + truncate_inode_pages(inode->i_mapping, inode->i_size);
> + ret = ext4_truncate(inode);
> + if (ret)
> + ext4_std_error(inode->i_sb, ret);
> + inode_unlock(inode);
> + (*nr_truncates)++;
> + } else {
> + if (test_opt(sb, DEBUG))
> + ext4_msg(sb, KERN_DEBUG,
> + "%s: deleting unreferenced inode %lu",
> + __func__, inode->i_ino);
> + jbd_debug(2, "deleting unreferenced inode %lu\n",
> + inode->i_ino);
> + (*nr_orphans)++;
> + }
> + iput(inode); /* The delete magic happens here! */
> +}
> +
> /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
> * the superblock) which were deleted from all directories, but held open by
> * a process at the time of a crash. We walk the list and try to delete these
> @@ -216,12 +339,17 @@ static int ext4_quota_on_mount(struct super_block *sb, int type)
> void ext4_orphan_cleanup(struct super_block *sb, struct ext4_super_block *es)
> {
> unsigned int s_flags = sb->s_flags;
> - int ret, nr_orphans = 0, nr_truncates = 0;
> + int nr_orphans = 0, nr_truncates = 0;
> + struct inode *inode;
> + int i, j;
> #ifdef CONFIG_QUOTA
> int quota_update = 0;
> - int i;
> #endif
> - if (!es->s_last_orphan) {
> + __le32 *bdata;
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
> +
> + if (!es->s_last_orphan && !oi->of_blocks) {
> jbd_debug(4, "no orphan inodes to clean up\n");
> return;
> }
> @@ -285,8 +413,6 @@ void ext4_orphan_cleanup(struct super_block *sb, struct ext4_super_block *es)
> #endif
>
> while (es->s_last_orphan) {
> - struct inode *inode;
> -
> /*
> * We may have encountered an error during cleanup; if
> * so, skip the rest.
> @@ -304,31 +430,21 @@ void ext4_orphan_cleanup(struct super_block *sb, struct ext4_super_block *es)
> }
>
> list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
> - dquot_initialize(inode);
> - if (inode->i_nlink) {
> - if (test_opt(sb, DEBUG))
> - ext4_msg(sb, KERN_DEBUG,
> - "%s: truncating inode %lu to %lld bytes",
> - __func__, inode->i_ino, inode->i_size);
> - jbd_debug(2, "truncating inode %lu to %lld bytes\n",
> - inode->i_ino, inode->i_size);
> - inode_lock(inode);
> - truncate_inode_pages(inode->i_mapping, inode->i_size);
> - ret = ext4_truncate(inode);
> - if (ret)
> - ext4_std_error(inode->i_sb, ret);
> - inode_unlock(inode);
> - nr_truncates++;
> - } else {
> - if (test_opt(sb, DEBUG))
> - ext4_msg(sb, KERN_DEBUG,
> - "%s: deleting unreferenced inode %lu",
> - __func__, inode->i_ino);
> - jbd_debug(2, "deleting unreferenced inode %lu\n",
> - inode->i_ino);
> - nr_orphans++;
> + ext4_process_orphan(inode, &nr_truncates, &nr_orphans);
> + }
> +
> + for (i = 0; i < oi->of_blocks; i++) {
> + bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
> + for (j = 0; j < inodes_per_ob; j++) {
> + if (!bdata[j])
> + continue;
> + inode = ext4_orphan_get(sb, le32_to_cpu(bdata[j]));
> + if (IS_ERR(inode))
> + continue;
> + ext4_set_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
> + EXT4_I(inode)->i_orphan_idx = i * inodes_per_ob + j;
> + ext4_process_orphan(inode, &nr_truncates, &nr_orphans);
> }
> - iput(inode); /* The delete magic happens here! */
> }
>
> #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
> @@ -350,3 +466,142 @@ void ext4_orphan_cleanup(struct super_block *sb, struct ext4_super_block *es)
> #endif
> sb->s_flags = s_flags; /* Restore SB_RDONLY status */
> }
> +
> +void ext4_release_orphan_info(struct super_block *sb)
> +{
> + int i;
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> +
> + if (!oi->of_blocks)
> + return;
> + for (i = 0; i < oi->of_blocks; i++)
> + brelse(oi->of_binfo[i].ob_bh);
> + kfree(oi->of_binfo);
> +}
> +
> +static struct ext4_orphan_block_tail *ext4_orphan_block_tail(
> + struct super_block *sb,
> + struct buffer_head *bh)
> +{
> + return (struct ext4_orphan_block_tail *)(bh->b_data + sb->s_blocksize -
> + sizeof(struct ext4_orphan_block_tail));
> +}
> +
> +static int ext4_orphan_file_block_csum_verify(struct super_block *sb,
> + struct buffer_head *bh)
> +{
> + __u32 calculated;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> + struct ext4_orphan_block_tail *ot;
> +
> + if (!ext4_has_metadata_csum(sb))
> + return 1;
> +
> + ot = ext4_orphan_block_tail(sb, bh);
> + calculated = ext4_chksum(EXT4_SB(sb), oi->of_csum_seed,
> + (__u8 *)bh->b_data,
> + inodes_per_ob * sizeof(__u32));
> + return le32_to_cpu(ot->ob_checksum) == calculated;
> +}
> +
> +/* This gets called only when checksumming is enabled */
> +void ext4_orphan_file_block_trigger(struct jbd2_buffer_trigger_type *triggers,
> + struct buffer_head *bh,
> + void *data, size_t size)
> +{
> + struct super_block *sb = EXT4_TRIGGER(triggers)->sb;
> + __u32 csum;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> + struct ext4_orphan_block_tail *ot;
> +
> + csum = ext4_chksum(EXT4_SB(sb), oi->of_csum_seed, (__u8 *)data,
> + inodes_per_ob * sizeof(__u32));
> + ot = ext4_orphan_block_tail(sb, bh);
> + ot->ob_checksum = cpu_to_le32(csum);
> +}
> +
> +int ext4_init_orphan_info(struct super_block *sb)
> +{
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> + struct inode *inode;
> + int i, j;
> + int ret;
> + int free;
> + __le32 *bdata;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
> + struct ext4_orphan_block_tail *ot;
> + ino_t orphan_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_orphan_file_inum);
> +
> + spin_lock_init(&oi->of_lock);
> +
> + if (!ext4_has_feature_orphan_file(sb))
> + return 0;
> +
> + inode = ext4_iget(sb, orphan_ino, EXT4_IGET_NORMAL);
> + if (IS_ERR(inode)) {
> + ext4_msg(sb, KERN_ERR, "get orphan inode failed");
> + return PTR_ERR(inode);
> + }
> + oi->of_blocks = inode->i_size >> sb->s_blocksize_bits;
> + oi->of_csum_seed = EXT4_I(inode)->i_csum_seed;
> + oi->of_binfo = kmalloc(oi->of_blocks*sizeof(struct ext4_orphan_block),
> + GFP_KERNEL);
> + if (!oi->of_binfo) {
> + ret = -ENOMEM;
> + goto out_put;
> + }
> + for (i = 0; i < oi->of_blocks; i++) {
> + oi->of_binfo[i].ob_bh = ext4_bread(NULL, inode, i, 0);
> + if (IS_ERR(oi->of_binfo[i].ob_bh)) {
> + ret = PTR_ERR(oi->of_binfo[i].ob_bh);
> + goto out_free;
> + }
> + if (!oi->of_binfo[i].ob_bh) {
> + ret = -EIO;
> + goto out_free;
> + }
> + ot = ext4_orphan_block_tail(sb, oi->of_binfo[i].ob_bh);
> + if (le32_to_cpu(ot->ob_magic) != EXT4_ORPHAN_BLOCK_MAGIC) {
> + ext4_error(sb, "orphan file block %d: bad magic", i);
> + ret = -EIO;
> + goto out_free;
> + }
> + if (!ext4_orphan_file_block_csum_verify(sb,
> + oi->of_binfo[i].ob_bh)) {
> + ext4_error(sb, "orphan file block %d: bad checksum", i);
> + ret = -EIO;
> + goto out_free;
> + }
> + bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
> + free = 0;
> + for (j = 0; j < inodes_per_ob; j++)
> + if (bdata[j] == 0)
> + free++;
> + oi->of_binfo[i].ob_free_entries = free;
> + }
> + iput(inode);
> + return 0;
> +out_free:
> + for (i--; i >= 0; i--)
> + brelse(oi->of_binfo[i].ob_bh);
> + kfree(oi->of_binfo);
> +out_put:
> + iput(inode);
> + return ret;
> +}
> +
> +int ext4_orphan_file_empty(struct super_block *sb)
> +{
> + struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
> + int i;
> + int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
> +
> + if (!ext4_has_feature_orphan_file(sb))
> + return 1;
> + for (i = 0; i < oi->of_blocks; i++)
> + if (oi->of_binfo[i].ob_free_entries != inodes_per_ob)
> + return 0;
> + return 1;
> +}
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 6e43c8546dc5..06f63b0cd988 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1164,6 +1164,7 @@ static void ext4_put_super(struct super_block *sb)
>
> flush_work(&sbi->s_error_work);
> destroy_workqueue(sbi->rsv_conversion_wq);
> + ext4_release_orphan_info(sb);
>
> /*
> * Unregister sysfs before destroying jbd2 journal.
> @@ -1189,6 +1190,7 @@ static void ext4_put_super(struct super_block *sb)
>
> if (!sb_rdonly(sb) && !aborted) {
> ext4_clear_feature_journal_needs_recovery(sb);
> + ext4_clear_feature_orphan_present(sb);
> es->s_state = cpu_to_le16(sbi->s_mount_state);
> }
> if (!sb_rdonly(sb))
> @@ -2695,8 +2697,11 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
> es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
> le16_add_cpu(&es->s_mnt_count, 1);
> ext4_update_tstamp(es, s_mtime);
> - if (sbi->s_journal)
> + if (sbi->s_journal) {
> ext4_set_feature_journal_needs_recovery(sb);
> + if (ext4_has_feature_orphan_file(sb))
> + ext4_set_feature_orphan_present(sb);
> + }
>
> err = ext4_commit_super(sb);
> done:
> @@ -3971,6 +3976,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> silent = 1;
> goto cantfind_ext4;
> }
> + ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
> + ext4_orphan_file_block_trigger);
>
> /* Load the checksum driver */
> sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
> @@ -4635,6 +4642,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> sb->s_root = NULL;
>
> needs_recovery = (es->s_last_orphan != 0 ||
> + ext4_has_feature_orphan_present(sb) ||
> ext4_has_feature_journal_needs_recovery(sb));
>
> if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
> @@ -4924,12 +4932,15 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> if (err)
> goto failed_mount7;
>
> + err = ext4_init_orphan_info(sb);
> + if (err)
> + goto failed_mount8;
> #ifdef CONFIG_QUOTA
> /* Enable quota usage during mount. */
> if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
> err = ext4_enable_quotas(sb);
> if (err)
> - goto failed_mount8;
> + goto failed_mount9;
> }
> #endif /* CONFIG_QUOTA */
>
> @@ -4948,7 +4959,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> ext4_msg(sb, KERN_INFO, "recovery complete");
> err = ext4_mark_recovery_complete(sb, es);
> if (err)
> - goto failed_mount8;
> + goto failed_mount9;
> }
> if (EXT4_SB(sb)->s_journal) {
> if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
> @@ -4994,6 +5005,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
> goto failed_mount;
>
> +failed_mount9:
> + ext4_release_orphan_info(sb);
> failed_mount8:
> ext4_unregister_sysfs(sb);
> kobject_put(&sbi->s_kobj);
> @@ -5505,8 +5518,15 @@ static int ext4_mark_recovery_complete(struct super_block *sb,
> if (err < 0)
> goto out;
>
> - if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
> + if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
> + ext4_has_feature_orphan_present(sb))) {
> + if (!ext4_orphan_file_empty(sb)) {
> + ext4_error(sb, "Orphan file not empty on read-only fs.");
> + err = -EFSCORRUPTED;
> + goto out;
> + }
> ext4_clear_feature_journal_needs_recovery(sb);
> + ext4_clear_feature_orphan_present(sb);
> ext4_commit_super(sb);
> }
> out:
> @@ -5649,6 +5669,8 @@ static int ext4_freeze(struct super_block *sb)
>
> /* Journal blocked and flushed, clear needs_recovery flag. */
> ext4_clear_feature_journal_needs_recovery(sb);
> + if (ext4_orphan_file_empty(sb))
> + ext4_clear_feature_orphan_present(sb);
> }
>
> error = ext4_commit_super(sb);
> @@ -5671,6 +5693,8 @@ static int ext4_unfreeze(struct super_block *sb)
> if (EXT4_SB(sb)->s_journal) {
> /* Reset the needs_recovery flag before the fs is unlocked. */
> ext4_set_feature_journal_needs_recovery(sb);
> + if (ext4_has_feature_orphan_file(sb))
> + ext4_set_feature_orphan_present(sb);
> }
>
> ext4_commit_super(sb);
> @@ -5876,7 +5900,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
> * around from a previously readonly bdev mount,
> * require a full umount/remount for now.
> */
> - if (es->s_last_orphan) {
> + if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
> ext4_msg(sb, KERN_WARNING, "Couldn't "
> "remount RDWR because of unprocessed "
> "orphan inode list. Please "
> --
> 2.26.2
>
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