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Date: Thu, 6 Jul 2017 16:36:20 +0800
From: Miao Xie <miaoxie@...wei.com>
To: Andreas Dilger <adilger@...ger.ca>
CC: Wang Shilong <wangshilong1991@...il.com>,
linux-ext4 <linux-ext4@...r.kernel.org>,
"Theodore Ts'o" <tytso@....edu>, Li Xi <lixi@....com>,
"zhangyi (F)" <yi.zhang@...wei.com>, <wshilong@....com>,
Shuichi Ihara <sihara@....com>
Subject: Re: [PATCH v2 1/2] ext4, project: expand inode extra size if possible
on 2017/7/6 at 15:34, Andreas Dilger wrote:
> On Jul 5, 2017, at 9:51 PM, Miao Xie <miaoxie@...wei.com> wrote:
>>
>> Sorry, I reply late.
>>
>> on 2017/7/6 at 0:31, Andreas Dilger wrote:
>>>>
>>>> + if (need_expand) {
>>>> + err = ext4_expand_extra_isize(inode,
>>>> + EXT4_SB(sb)->s_want_extra_isize,
>>>> + iloc, handle);
>>>> + if (err)
>>>> + goto out_stop;
>>>> + }
>>>> +
>>
>> I found ext4_expand_extra_isize just tried to expand extra isize,
>> it would give up and return 0 if someone was holding attr lock.
>> so though it return 0, extra isize may not be expanded successfully.
>> So ...
>>
>> How about the following patches?
>
> Can you please resubmit the patches, one per email, and in their own thread
> (not a reply to an existing discussion).
No problem.
Thanks
Miao
> Cheers, Andreas
>
>>
>> From 6e3362e9e9ee81f7184036ff0df7d010c368bac8 Mon Sep 17 00:00:00 2001
>> From: Miao Xie <miaoxie@...wei.com>
>> Date: Wed, 5 Jul 2017 18:29:53 +0800
>> Subject: [PATCH 1/4] ext4: fix forgetten xattr lock protection in
>> ext4_expand_extra_isize
>>
>> We should avoid the contention between the i_extra_isize update and
>> the inline data insertion, so move the xattr trylock in front of
>> i_extra_isize update.
>>
>> Signed-off-by: Miao Xie <miaoxie@...wei.com>
>> ---
>> fs/ext4/inode.c | 18 ++++++++++++++++--
>> fs/ext4/xattr.c | 10 ----------
>> 2 files changed, 16 insertions(+), 12 deletions(-)
>>
>> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
>> index 5cf82d0..4af3edc 100644
>> --- a/fs/ext4/inode.c
>> +++ b/fs/ext4/inode.c
>> @@ -5639,10 +5639,15 @@ static int ext4_expand_extra_isize(struct inode *inode,
>> {
>> struct ext4_inode *raw_inode;
>> struct ext4_xattr_ibody_header *header;
>> + int no_expand;
>> + int error;
>>
>> if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
>> return 0;
>>
>> + if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
>> + return 0;
>> +
>> raw_inode = ext4_raw_inode(&iloc);
>>
>> header = IHDR(inode, raw_inode);
>> @@ -5654,12 +5659,21 @@ static int ext4_expand_extra_isize(struct inode *inode,
>> EXT4_I(inode)->i_extra_isize, 0,
>> new_extra_isize - EXT4_I(inode)->i_extra_isize);
>> EXT4_I(inode)->i_extra_isize = new_extra_isize;
>> + ext4_write_unlock_xattr(inode, &no_expand);
>> return 0;
>> }
>>
>> /* try to expand with EAs present */
>> - return ext4_expand_extra_isize_ea(inode, new_extra_isize,
>> - raw_inode, handle);
>> + error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
>> + raw_inode, handle);
>> + if (error) {
>> + /*
>> + * Inode size expansion failed; don't try again
>> + */
>> + no_expand = 1;
>> + }
>> + ext4_write_unlock_xattr(inode, &no_expand);
>> + return error;
>> }
>>
>> /*
>> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
>> index 5d3c253..12ee5fb 100644
>> --- a/fs/ext4/xattr.c
>> +++ b/fs/ext4/xattr.c
>> @@ -1472,10 +1472,6 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> int error = 0, tried_min_extra_isize = 0;
>> int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
>> int isize_diff; /* How much do we need to grow i_extra_isize */
>> - int no_expand;
>> -
>> - if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
>> - return 0;
>>
>> retry:
>> isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize;
>> @@ -1558,16 +1554,10 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> EXT4_I(inode)->i_extra_isize = new_extra_isize;
>> brelse(bh);
>> out:
>> - ext4_write_unlock_xattr(inode, &no_expand);
>> return 0;
>>
>> cleanup:
>> brelse(bh);
>> - /*
>> - * Inode size expansion failed; don't try again
>> - */
>> - no_expand = 1;
>> - ext4_write_unlock_xattr(inode, &no_expand);
>> return error;
>> }
>>
>> --
>> 2.5.0
>>
>>
>> From 6ea3ddf433a28032764d0b200a61805ccf85c07a Mon Sep 17 00:00:00 2001
>> From: Miao Xie <miaoxie@...wei.com>
>> Date: Wed, 5 Jul 2017 19:30:14 +0800
>> Subject: [PATCH 2/4] ext4: restructure ext4_expand_extra_isize
>>
>> Current ext4_expand_extra_isize just tries to expand extra isize, if
>> someone is holding xattr lock or some check fails, it will give up.
>> So rename its name to ext4_try_to_expand_extra_isize.
>>
>> Besides that, we clean up unnecessary check and move some relative checks
>> into it.
>>
>> Signed-off-by: Miao Xie <miaoxie@...wei.com>
>> ---
>> fs/ext4/inode.c | 67 ++++++++++++++++++++++++---------------------------------
>> fs/ext4/xattr.c | 11 +++++++++-
>> 2 files changed, 38 insertions(+), 40 deletions(-)
>>
>> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
>> index 4af3edc..01a9340 100644
>> --- a/fs/ext4/inode.c
>> +++ b/fs/ext4/inode.c
>> @@ -5632,21 +5632,35 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
>> * Expand an inode by new_extra_isize bytes.
>> * Returns 0 on success or negative error number on failure.
>> */
>> -static int ext4_expand_extra_isize(struct inode *inode,
>> - unsigned int new_extra_isize,
>> - struct ext4_iloc iloc,
>> - handle_t *handle)
>> +static int ext4_try_to_expand_extra_isize(struct inode *inode,
>> + unsigned int new_extra_isize,
>> + struct ext4_iloc iloc,
>> + handle_t *handle)
>> {
>> struct ext4_inode *raw_inode;
>> struct ext4_xattr_ibody_header *header;
>> int no_expand;
>> int error;
>>
>> - if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
>> - return 0;
>> + if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND))
>> + return -EOVERFLOW;
>> +
>> + /*
>> + * In nojournal mode, we can immediately attempt to expand
>> + * the inode. When journaled, we first need to obtain extra
>> + * buffer credits since we may write into the EA block
>> + * with this same handle. If journal_extend fails, then it will
>> + * only result in a minor loss of functionality for that inode.
>> + * If this is felt to be critical, then e2fsck should be run to
>> + * force a large enough s_min_extra_isize.
>> + */
>> + if (ext4_handle_valid(handle) &&
>> + jbd2_journal_extend(handle,
>> + EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) != 0)
>> + return -ENOSPC;
>>
>> if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
>> - return 0;
>> + return -EBUSY;
>>
>> raw_inode = ext4_raw_inode(&iloc);
>>
>> @@ -5673,6 +5687,7 @@ static int ext4_expand_extra_isize(struct inode *inode,
>> no_expand = 1;
>> }
>> ext4_write_unlock_xattr(inode, &no_expand);
>> +
>> return error;
>> }
>>
>> @@ -5693,44 +5708,18 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
>> {
>> struct ext4_iloc iloc;
>> struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
>> - static unsigned int mnt_count;
>> - int err, ret;
>> + int err;
>>
>> might_sleep();
>> trace_ext4_mark_inode_dirty(inode, _RET_IP_);
>> err = ext4_reserve_inode_write(handle, inode, &iloc);
>> if (err)
>> return err;
>> - if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize &&
>> - !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) {
>> - /*
>> - * In nojournal mode, we can immediately attempt to expand
>> - * the inode. When journaled, we first need to obtain extra
>> - * buffer credits since we may write into the EA block
>> - * with this same handle. If journal_extend fails, then it will
>> - * only result in a minor loss of functionality for that inode.
>> - * If this is felt to be critical, then e2fsck should be run to
>> - * force a large enough s_min_extra_isize.
>> - */
>> - if (!ext4_handle_valid(handle) ||
>> - jbd2_journal_extend(handle,
>> - EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) == 0) {
>> - ret = ext4_expand_extra_isize(inode,
>> - sbi->s_want_extra_isize,
>> - iloc, handle);
>> - if (ret) {
>> - if (mnt_count !=
>> - le16_to_cpu(sbi->s_es->s_mnt_count)) {
>> - ext4_warning(inode->i_sb,
>> - "Unable to expand inode %lu. Delete"
>> - " some EAs or run e2fsck.",
>> - inode->i_ino);
>> - mnt_count =
>> - le16_to_cpu(sbi->s_es->s_mnt_count);
>> - }
>> - }
>> - }
>> - }
>> +
>> + if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize)
>> + ext4_try_to_expand_extra_isize(inode, sbi->s_want_extra_isize,
>> + iloc, handle);
>> +
>> return ext4_mark_iloc_dirty(handle, inode, &iloc);
>> }
>>
>> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
>> index 12ee5fb..3c6c225 100644
>> --- a/fs/ext4/xattr.c
>> +++ b/fs/ext4/xattr.c
>> @@ -1465,12 +1465,14 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> {
>> struct ext4_xattr_ibody_header *header;
>> struct buffer_head *bh = NULL;
>> + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
>> + static unsigned int mnt_count;
>> size_t min_offs;
>> size_t ifree, bfree;
>> int total_ino;
>> void *base, *end;
>> int error = 0, tried_min_extra_isize = 0;
>> - int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
>> + int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize);
>> int isize_diff; /* How much do we need to grow i_extra_isize */
>>
>> retry:
>> @@ -1558,6 +1560,13 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>>
>> cleanup:
>> brelse(bh);
>> +
>> + if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) {
>> + ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
>> + inode->i_ino);
>> + mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
>> + }
>> +
>> return error;
>> }
>>
>> --
>> 2.5.0
>>
>> From c6cb954d91be4af11271480004c8873971123502 Mon Sep 17 00:00:00 2001
>> From: Miao Xie <miaoxie@...wei.com>
>> Date: Wed, 5 Jul 2017 19:43:55 +0800
>> Subject: [PATCH 3/4] ext4: cleanup ext4_expand_extra_isize_ea()
>>
>> Clean up some goto statement, make ext4_expand_extra_isize_ea() clearer.
>>
>> Signed-off-by: Miao Xie <miaoxie@...wei.com>
>> ---
>> fs/ext4/xattr.c | 15 +++++----------
>> 1 file changed, 5 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
>> index 3c6c225..73fbe4a 100644
>> --- a/fs/ext4/xattr.c
>> +++ b/fs/ext4/xattr.c
>> @@ -1464,7 +1464,7 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> struct ext4_inode *raw_inode, handle_t *handle)
>> {
>> struct ext4_xattr_ibody_header *header;
>> - struct buffer_head *bh = NULL;
>> + struct buffer_head *bh;
>> struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
>> static unsigned int mnt_count;
>> size_t min_offs;
>> @@ -1478,7 +1478,7 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> retry:
>> isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize;
>> if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
>> - goto out;
>> + return 0;
>>
>> header = IHDR(inode, raw_inode);
>>
>> @@ -1513,6 +1513,7 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> EXT4_ERROR_INODE(inode, "bad block %llu",
>> EXT4_I(inode)->i_file_acl);
>> error = -EFSCORRUPTED;
>> + brelse(bh);
>> goto cleanup;
>> }
>> base = BHDR(bh);
>> @@ -1520,11 +1521,11 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> min_offs = end - base;
>> bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base,
>> NULL);
>> + brelse(bh);
>> if (bfree + ifree < isize_diff) {
>> if (!tried_min_extra_isize && s_min_extra_isize) {
>> tried_min_extra_isize++;
>> new_extra_isize = s_min_extra_isize;
>> - brelse(bh);
>> goto retry;
>> }
>> error = -ENOSPC;
>> @@ -1542,7 +1543,6 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> s_min_extra_isize) {
>> tried_min_extra_isize++;
>> new_extra_isize = s_min_extra_isize;
>> - brelse(bh);
>> goto retry;
>> }
>> goto cleanup;
>> @@ -1554,14 +1554,9 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
>> EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
>> (void *)header, total_ino);
>> EXT4_I(inode)->i_extra_isize = new_extra_isize;
>> - brelse(bh);
>> -out:
>> - return 0;
>>
>> cleanup:
>> - brelse(bh);
>> -
>> - if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) {
>> + if (error && mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) {
>> ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
>> inode->i_ino);
>> mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
>> --
>> 2.5.0
>>
>> From e2ff4a302588e9d564734219b38c7dddb13f3c1e Mon Sep 17 00:00:00 2001
>> From: Miao Xie <miaoxie@...wei.com>
>> Date: Wed, 5 Jul 2017 21:01:26 +0800
>> Subject: [PATCH 4/4] ext4, project: expand inode extra size if possible
>>
>> when upgrading from old format, try to set project id
>> to old file first time, it will return EOVERFLOW, but if
>> that file is dirtied(touch etc), changing project id will
>> be allowed, this might be confusing for users, we could
>> try to expand @i_extra_iszie here too.
>>
>> Reported-by: Zhang Yi <yi.zhang@...wei.com>
>> Signed-off-by: Miao Xie <miaoxie@...wei.com>
>> Signed-off-by: Wang Shilong <wshilong@....com>
>> ---
>> fs/ext4/ext4_jbd2.h | 3 ++
>> fs/ext4/inode.c | 97 +++++++++++++++++++++++++++++++++++++++++------------
>> fs/ext4/ioctl.c | 9 +++--
>> 3 files changed, 85 insertions(+), 24 deletions(-)
>>
>> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
>> index f976111..3149fdd 100644
>> --- a/fs/ext4/ext4_jbd2.h
>> +++ b/fs/ext4/ext4_jbd2.h
>> @@ -234,6 +234,9 @@ int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
>>
>> int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
>>
>> +int ext4_expand_extra_isize(struct inode *inode,
>> + unsigned int new_extra_isize,
>> + struct ext4_iloc *iloc);
>> /*
>> * Wrapper functions with which ext4 calls into JBD.
>> */
>> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
>> index 01a9340..41a353f 100644
>> --- a/fs/ext4/inode.c
>> +++ b/fs/ext4/inode.c
>> @@ -5628,6 +5628,42 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
>> return err;
>> }
>>
>> +static int __ext4_expand_extra_isize(struct inode *inode,
>> + unsigned int new_extra_isize,
>> + struct ext4_iloc *iloc,
>> + handle_t *handle, int *no_expand)
>> +{
>> + struct ext4_inode *raw_inode;
>> + struct ext4_xattr_ibody_header *header;
>> + int error;
>> +
>> + raw_inode = ext4_raw_inode(iloc);
>> +
>> + header = IHDR(inode, raw_inode);
>> +
>> + /* No extended attributes present */
>> + if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
>> + header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
>> + memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
>> + EXT4_I(inode)->i_extra_isize, 0,
>> + new_extra_isize - EXT4_I(inode)->i_extra_isize);
>> + EXT4_I(inode)->i_extra_isize = new_extra_isize;
>> + return 0;
>> + }
>> +
>> + /* try to expand with EAs present */
>> + error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
>> + raw_inode, handle);
>> + if (error) {
>> + /*
>> + * Inode size expansion failed; don't try again
>> + */
>> + *no_expand = 1;
>> + }
>> +
>> + return error;
>> +}
>> +
>> /*
>> * Expand an inode by new_extra_isize bytes.
>> * Returns 0 on success or negative error number on failure.
>> @@ -5637,8 +5673,6 @@ static int ext4_try_to_expand_extra_isize(struct inode *inode,
>> struct ext4_iloc iloc,
>> handle_t *handle)
>> {
>> - struct ext4_inode *raw_inode;
>> - struct ext4_xattr_ibody_header *header;
>> int no_expand;
>> int error;
>>
>> @@ -5662,32 +5696,53 @@ static int ext4_try_to_expand_extra_isize(struct inode *inode,
>> if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
>> return -EBUSY;
>>
>> - raw_inode = ext4_raw_inode(&iloc);
>> + error = __ext4_expand_extra_isize(inode, new_extra_isize, &iloc,
>> + handle, &no_expand);
>> + ext4_write_unlock_xattr(inode, &no_expand);
>>
>> - header = IHDR(inode, raw_inode);
>> + return error;
>> +}
>>
>> - /* No extended attributes present */
>> - if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
>> - header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
>> - memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
>> - EXT4_I(inode)->i_extra_isize, 0,
>> - new_extra_isize - EXT4_I(inode)->i_extra_isize);
>> - EXT4_I(inode)->i_extra_isize = new_extra_isize;
>> - ext4_write_unlock_xattr(inode, &no_expand);
>> - return 0;
>> +int ext4_expand_extra_isize(struct inode *inode,
>> + unsigned int new_extra_isize,
>> + struct ext4_iloc *iloc)
>> +{
>> + handle_t *handle;
>> + int no_expand;
>> + int error, rc;
>> +
>> + if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) {
>> + brelse(iloc->bh);
>> + return -EOVERFLOW;
>> }
>>
>> - /* try to expand with EAs present */
>> - error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
>> - raw_inode, handle);
>> + handle = ext4_journal_start(inode, EXT4_HT_INODE,
>> + EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
>> + if (IS_ERR(handle)) {
>> + error = PTR_ERR(handle);
>> + brelse(iloc->bh);
>> + return error;
>> + }
>> +
>> + ext4_write_lock_xattr(inode, &no_expand);
>> +
>> + BUFFER_TRACE(iloc.bh, "get_write_access");
>> + error = ext4_journal_get_write_access(handle, iloc->bh);
>> if (error) {
>> - /*
>> - * Inode size expansion failed; don't try again
>> - */
>> - no_expand = 1;
>> + brelse(iloc->bh);
>> + goto out_stop;
>> }
>> - ext4_write_unlock_xattr(inode, &no_expand);
>>
>> + error = __ext4_expand_extra_isize(inode, new_extra_isize, iloc,
>> + handle, &no_expand);
>> +
>> + rc = ext4_mark_iloc_dirty(handle, inode, iloc);
>> + if (!error)
>> + error = rc;
>> +
>> + ext4_write_unlock_xattr(inode, &no_expand);
>> +out_stop:
>> + ext4_journal_stop(handle);
>> return error;
>> }
>>
>> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
>> index 0c21e22..0120207 100644
>> --- a/fs/ext4/ioctl.c
>> +++ b/fs/ext4/ioctl.c
>> @@ -351,11 +351,14 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
>>
>> raw_inode = ext4_raw_inode(&iloc);
>> if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
>> - err = -EOVERFLOW;
>> + err = ext4_expand_extra_isize(inode,
>> + EXT4_SB(sb)->s_want_extra_isize,
>> + &iloc);
>> + if (err)
>> + goto out_unlock;
>> + } else {
>> brelse(iloc.bh);
>> - goto out_unlock;
>> }
>> - brelse(iloc.bh);
>>
>> dquot_initialize(inode);
>>
>> --
>> 2.5.0
>>
>
>
> Cheers, Andreas
>
>
>
>
>
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