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Date: Sun, 5 Nov 2017 16:49:07 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: Chao Yu <yuchao0@...wei.com>, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: stop all the operations by cp_error
flag
On 11/05, Chao Yu wrote:
> Hi Jaegeuk,
>
> On 2017/10/24 17:51, Chao Yu wrote:
> > On 2017/10/24 6:14, Jaegeuk Kim wrote:
> >> This patch replaces to use cp_error flag instead of RDONLY for quota off.
>
> We should convert error number with block_page_mkwrite_return in .page_mkwrite,
> otherwise generic/019 will cause a deadlock issue with below kernel message
> printed:
Fixed. :)
Thanks,
>
> ============================================
> WARNING: possible recursive locking detected
> 4.14.0-rc1 #35 Tainted: G W O
> --------------------------------------------
> fio/5845 is trying to acquire lock:
> (&mm->mmap_sem){++++}, at: [<c104be02>] __do_page_fault+0x482/0x510
>
> but task is already holding lock:
> (&mm->mmap_sem){++++}, at: [<c104ba9e>] __do_page_fault+0x11e/0x510
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(&mm->mmap_sem);
> lock(&mm->mmap_sem);
>
> *** DEADLOCK ***
>
> May be due to missing lock nesting notation
>
> 1 lock held by fio/5845:
> #0: (&mm->mmap_sem){++++}, at: [<c104ba9e>] __do_page_fault+0x11e/0x510
>
> stack backtrace:
> CPU: 3 PID: 5845 Comm: fio Tainted: G W O 4.14.0-rc1 #35
> Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
> Call Trace:
> dump_stack+0x5f/0x92
> __lock_acquire+0x1019/0x12c0
> lock_acquire+0xae/0x220
> down_read+0x38/0x60
> __do_page_fault+0x482/0x510
> do_page_fault+0x26/0x290
> common_exception+0x64/0x6a
>
>
> ---
> fs/f2fs/file.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index e67f03546391..0ce1e82591d1 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -53,8 +53,10 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> struct dnode_of_data dn;
> int err;
>
> - if (unlikely(f2fs_cp_error(sbi)))
> - return -EIO;
> + if (unlikely(f2fs_cp_error(sbi))) {
> + err = -EIO;
> + goto out;
> + }
>
> sb_start_pagefault(inode->i_sb);
>
> @@ -66,7 +68,7 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> err = f2fs_reserve_block(&dn, page->index);
> if (err) {
> f2fs_unlock_op(sbi);
> - goto out;
> + goto out_end;
> }
> f2fs_put_dnode(&dn);
> f2fs_unlock_op(sbi);
> @@ -114,9 +116,10 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
>
> out_sem:
> up_read(&F2FS_I(inode)->i_mmap_sem);
> -out:
> +out_end:
> sb_end_pagefault(inode->i_sb);
> f2fs_update_time(sbi, REQ_TIME);
> +out:
> return block_page_mkwrite_return(err);
> }
>
> --
>
>
> Thanks,
>
> >>
> >> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> >
> > Reviewed-by: Chao Yu <yuchao0@...wei.com>
> >
> > Thanks,
> >
> >> ---
> >> fs/f2fs/acl.c | 3 +++
> >> fs/f2fs/checkpoint.c | 1 -
> >> fs/f2fs/file.c | 23 +++++++++++++++++++++++
> >> fs/f2fs/namei.c | 30 ++++++++++++++++++++++++++++++
> >> fs/f2fs/super.c | 3 +++
> >> 5 files changed, 59 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
> >> index f6471f9d707e..a9bf5151e7c2 100644
> >> --- a/fs/f2fs/acl.c
> >> +++ b/fs/f2fs/acl.c
> >> @@ -254,6 +254,9 @@ static int __f2fs_set_acl(struct inode *inode, int type,
> >>
> >> int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> >> {
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> return __f2fs_set_acl(inode, type, acl, NULL);
> >> }
> >>
> >> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> >> index 201608281681..6b52d4b66c7b 100644
> >> --- a/fs/f2fs/checkpoint.c
> >> +++ b/fs/f2fs/checkpoint.c
> >> @@ -29,7 +29,6 @@ struct kmem_cache *inode_entry_slab;
> >> void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi, bool end_io)
> >> {
> >> set_ckpt_flags(sbi, CP_ERROR_FLAG);
> >> - sbi->sb->s_flags |= MS_RDONLY;
> >> if (!end_io)
> >> f2fs_flush_merged_writes(sbi);
> >> }
> >> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> >> index 56232a72d2a3..0e09b9f02dc5 100644
> >> --- a/fs/f2fs/file.c
> >> +++ b/fs/f2fs/file.c
> >> @@ -53,6 +53,9 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> >> struct dnode_of_data dn;
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> sb_start_pagefault(inode->i_sb);
> >>
> >> f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
> >> @@ -310,6 +313,8 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
> >>
> >> int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
> >> {
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(file)))))
> >> + return -EIO;
> >> return f2fs_do_sync_file(file, start, end, datasync, false);
> >> }
> >>
> >> @@ -446,6 +451,9 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
> >> struct inode *inode = file_inode(file);
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> /* we don't need to use inline_data strictly */
> >> err = f2fs_convert_inline_inode(inode);
> >> if (err)
> >> @@ -632,6 +640,9 @@ int f2fs_truncate(struct inode *inode)
> >> {
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
> >> S_ISLNK(inode->i_mode)))
> >> return 0;
> >> @@ -731,6 +742,9 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
> >> int err;
> >> bool size_changed = false;
> >>
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> err = setattr_prepare(dentry, attr);
> >> if (err)
> >> return err;
> >> @@ -1459,6 +1473,9 @@ static long f2fs_fallocate(struct file *file, int mode,
> >> struct inode *inode = file_inode(file);
> >> long ret = 0;
> >>
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> /* f2fs only support ->fallocate for regular file */
> >> if (!S_ISREG(inode->i_mode))
> >> return -EINVAL;
> >> @@ -2637,6 +2654,9 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
> >>
> >> long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> >> {
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
> >> + return -EIO;
> >> +
> >> switch (cmd) {
> >> case F2FS_IOC_GETFLAGS:
> >> return f2fs_ioc_getflags(filp, arg);
> >> @@ -2694,6 +2714,9 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
> >> struct blk_plug plug;
> >> ssize_t ret;
> >>
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> >> + return -EIO;
> >> +
> >> inode_lock(inode);
> >> ret = generic_write_checks(iocb, from);
> >> if (ret > 0) {
> >> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> >> index e6f86d5d97b9..944f7a6940b6 100644
> >> --- a/fs/f2fs/namei.c
> >> +++ b/fs/f2fs/namei.c
> >> @@ -183,6 +183,9 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> >> nid_t ino = 0;
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> err = dquot_initialize(dir);
> >> if (err)
> >> return err;
> >> @@ -227,6 +230,9 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
> >> struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> if (f2fs_encrypted_inode(dir) &&
> >> !fscrypt_has_permitted_context(dir, inode))
> >> return -EPERM;
> >> @@ -426,6 +432,9 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
> >>
> >> trace_f2fs_unlink_enter(dir, dentry);
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> err = dquot_initialize(dir);
> >> if (err)
> >> return err;
> >> @@ -481,6 +490,9 @@ static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
> >> struct fscrypt_symlink_data *sd = NULL;
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> if (f2fs_encrypted_inode(dir)) {
> >> err = fscrypt_get_encryption_info(dir);
> >> if (err)
> >> @@ -587,6 +599,9 @@ static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
> >> struct inode *inode;
> >> int err;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> err = dquot_initialize(dir);
> >> if (err)
> >> return err;
> >> @@ -639,6 +654,9 @@ static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
> >> struct inode *inode;
> >> int err = 0;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> err = dquot_initialize(dir);
> >> if (err)
> >> return err;
> >> @@ -733,6 +751,9 @@ static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
> >>
> >> static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
> >> {
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
> >> + return -EIO;
> >> +
> >> if (f2fs_encrypted_inode(dir)) {
> >> int err = fscrypt_get_encryption_info(dir);
> >> if (err)
> >> @@ -744,6 +765,9 @@ static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
> >>
> >> static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
> >> {
> >> + if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
> >> + return -EIO;
> >> +
> >> return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
> >> }
> >>
> >> @@ -763,6 +787,9 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
> >> bool is_old_inline = f2fs_has_inline_dentry(old_dir);
> >> int err = -ENOENT;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> if ((f2fs_encrypted_inode(old_dir) &&
> >> !fscrypt_has_encryption_key(old_dir)) ||
> >> (f2fs_encrypted_inode(new_dir) &&
> >> @@ -956,6 +983,9 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
> >> int old_nlink = 0, new_nlink = 0;
> >> int err = -ENOENT;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return -EIO;
> >> +
> >> if ((f2fs_encrypted_inode(old_dir) &&
> >> !fscrypt_has_encryption_key(old_dir)) ||
> >> (f2fs_encrypted_inode(new_dir) &&
> >> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> >> index 7659b348582a..213d2c1e5759 100644
> >> --- a/fs/f2fs/super.c
> >> +++ b/fs/f2fs/super.c
> >> @@ -885,6 +885,9 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
> >> struct f2fs_sb_info *sbi = F2FS_SB(sb);
> >> int err = 0;
> >>
> >> + if (unlikely(f2fs_cp_error(sbi)))
> >> + return 0;
> >> +
> >> trace_f2fs_sync_fs(sb, sync);
> >>
> >> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> >>
> >
> >
> > ------------------------------------------------------------------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > _______________________________________________
> > Linux-f2fs-devel mailing list
> > Linux-f2fs-devel@...ts.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >
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