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Date: Mon, 27 Sep 2021 18:10:00 +0300
From: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To: Kari Argillander <kari.argillander@...il.com>
CC: <ntfs3@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
<linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/3] fs/ntfs3: Remove locked argument in ntfs_set_ea
On 25.09.2021 11:49, Kari Argillander wrote:
> On Fri, Sep 24, 2021 at 07:15:50PM +0300, Konstantin Komarov wrote:
>> We always need to lock now, because locks became smaller
>> (see "Move ni_lock_dir and ni_unlock into ntfs_create_inode").
>
> So basically this actually fixes that commit?
>
> Fixes: d562e901f25d ("fs/ntfs3: Move ni_lock_dir and ni_unlock into ntfs_create_inode")
>
> Or if you do not use fixes atleast use
>
> d562e901f25d ("fs/ntfs3: Move ni_lock_dir and ni_unlock into ntfs_create_inode")
>
> You can add these to your gitconfig
>
> [core]
> abbrev = 12
> [pretty]
> fixes = Fixes: %h (\"%s\")
> fixed = Fixes: %h (\"%s\")
>
> And get this annotation with
> git show --pretty=fixes <sha>
>
> Have some comments below also.
>
>>
>> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
>> ---
>> fs/ntfs3/xattr.c | 28 +++++++++++++---------------
>> 1 file changed, 13 insertions(+), 15 deletions(-)
>>
>> diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
>> index 253a07d9aa7b..1ab109723b10 100644
>> --- a/fs/ntfs3/xattr.c
>> +++ b/fs/ntfs3/xattr.c
>> @@ -257,7 +257,7 @@ static int ntfs_get_ea(struct inode *inode, const char *name, size_t name_len,
>>
>> static noinline int ntfs_set_ea(struct inode *inode, const char *name,
>> size_t name_len, const void *value,
>> - size_t val_size, int flags, int locked)
>> + size_t val_size, int flags)
>> {
>> struct ntfs_inode *ni = ntfs_i(inode);
>> struct ntfs_sb_info *sbi = ni->mi.sbi;
>> @@ -276,8 +276,7 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name,
>> u64 new_sz;
>> void *p;
>>
>> - if (!locked)
>> - ni_lock(ni);
>> + ni_lock(ni);
>>
>> run_init(&ea_run);
>>
>> @@ -465,8 +464,7 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name,
>> mark_inode_dirty(&ni->vfs_inode);
>>
>> out:
>> - if (!locked)
>> - ni_unlock(ni);
>> + ni_unlock(ni);
>>
>> run_close(&ea_run);
>> kfree(ea_all);
>> @@ -537,7 +535,7 @@ struct posix_acl *ntfs_get_acl(struct inode *inode, int type)
>>
>> static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
>> struct inode *inode, struct posix_acl *acl,
>> - int type, int locked)
>> + int type)
>> {
>> const char *name;
>> size_t size, name_len;
>> @@ -594,7 +592,7 @@ static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
>> flags = 0;
>> }
>>
>> - err = ntfs_set_ea(inode, name, name_len, value, size, flags, locked);
>> + err = ntfs_set_ea(inode, name, name_len, value, size, flags);
>> if (err == -ENODATA && !size)
>> err = 0; /* Removing non existed xattr. */
>> if (!err)
>> @@ -612,7 +610,7 @@ static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
>> int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
>> struct posix_acl *acl, int type)
>> {
>> - return ntfs_set_acl_ex(mnt_userns, inode, acl, type, 0);
>> + return ntfs_set_acl_ex(mnt_userns, inode, acl, type);
>> }
>>
>> static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
>> @@ -693,7 +691,7 @@ int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
>>
>> if (default_acl) {
>> err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
>> - ACL_TYPE_DEFAULT, 1);
>> + ACL_TYPE_DEFAULT);
>> posix_acl_release(default_acl);
>> } else {
>> inode->i_default_acl = NULL;
>> @@ -704,7 +702,7 @@ int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
>> else {
>> if (!err)
>> err = ntfs_set_acl_ex(mnt_userns, inode, acl,
>> - ACL_TYPE_ACCESS, 1);
>> + ACL_TYPE_ACCESS);
>> posix_acl_release(acl);
>> }
>>
>> @@ -988,7 +986,7 @@ static noinline int ntfs_setxattr(const struct xattr_handler *handler,
>> }
>> #endif
>> /* Deal with NTFS extended attribute. */
>> - err = ntfs_set_ea(inode, name, name_len, value, size, flags, 0);
>> + err = ntfs_set_ea(inode, name, name_len, value, size, flags);
>>
>> out:
>> return err;
>> @@ -1006,26 +1004,26 @@ int ntfs_save_wsl_perm(struct inode *inode)
>>
>> value = cpu_to_le32(i_uid_read(inode));
>> err = ntfs_set_ea(inode, "$LXUID", sizeof("$LXUID") - 1, &value,
>> - sizeof(value), 0, 0);
>> + sizeof(value), 0);
>> if (err)
>> goto out;
>>
>> value = cpu_to_le32(i_gid_read(inode));
>> err = ntfs_set_ea(inode, "$LXGID", sizeof("$LXGID") - 1, &value,
>> - sizeof(value), 0, 0);
>> + sizeof(value), 0);
>> if (err)
>> goto out;
>>
>> value = cpu_to_le32(inode->i_mode);
>> err = ntfs_set_ea(inode, "$LXMOD", sizeof("$LXMOD") - 1, &value,
>> - sizeof(value), 0, 0);
>> + sizeof(value), 0);
>> if (err)
>> goto out;
>>
>> if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
>> value = cpu_to_le32(inode->i_rdev);
>> err = ntfs_set_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1, &value,
>> - sizeof(value), 0, 0);
>> + sizeof(value), 0);
>
> Is this really that we can lock/unlock same lock 4 times in a row in a
> ntfs_set_ea? This does not feel correct.
>
> Argillander
>
How it was working before d562e901f25d
"fs/ntfs3: Move ni_lock_dir and ni_unlock into ntfs_create_inode":
ntfs_create (lock mutex) =>
ntfs_create_inode =>
ntfs_save_wsl_perm (we are under lock here) =>
return to ntfs_create and unlock
How it works with d562e901f25d:
ntfs_create =>
ntfs_create_inode (lock in line 1201 file fs/ntfs3/inode.c
and unlock in line 1557) =>
ntfs_save_wsl_perm (we aren't under lock here in line 1605)
So we need to lock 4 times because there are 4 ntfs_set_ea calls.
But now there can be done more work between those calls
in other threads, locks became more granular.
>> if (err)
>> goto out;
>> }
>> --
>> 2.33.0
>>
>>
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