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Date: Tue, 12 Mar 2024 18:33:19 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] f2fs: support .shutdown in f2fs_sops
Will check this after merge window.
On 03/12, Chao Yu wrote:
> Ping,
>
> On 2024/2/29 22:38, Chao Yu wrote:
> > Support .shutdown callback in f2fs_sops, then, it can be called to
> > shut down the file system when underlying block device is marked dead.
> >
> > Signed-off-by: Chao Yu <chao@...nel.org>
> > ---
> > fs/f2fs/f2fs.h | 2 ++
> > fs/f2fs/file.c | 70 ++++++++++++++++++++++++++++++-------------------
> > fs/f2fs/super.c | 6 +++++
> > 3 files changed, 51 insertions(+), 27 deletions(-)
> >
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 85eb9a8a5ed3..80789255bf68 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -3506,6 +3506,8 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
> > struct iattr *attr);
> > int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
> > void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count);
> > +int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
> > + bool readonly);
> > int f2fs_precache_extents(struct inode *inode);
> > int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
> > int f2fs_fileattr_set(struct mnt_idmap *idmap,
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 4ca6c693b33a..d223175b3d5c 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -2226,34 +2226,13 @@ static int f2fs_ioc_abort_atomic_write(struct file *filp)
> > return ret;
> > }
> > -static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
> > +int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
> > + bool readonly)
> > {
> > - struct inode *inode = file_inode(filp);
> > - struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > struct super_block *sb = sbi->sb;
> > - __u32 in;
> > int ret = 0;
> > - if (!capable(CAP_SYS_ADMIN))
> > - return -EPERM;
> > -
> > - if (get_user(in, (__u32 __user *)arg))
> > - return -EFAULT;
> > -
> > - if (in != F2FS_GOING_DOWN_FULLSYNC) {
> > - ret = mnt_want_write_file(filp);
> > - if (ret) {
> > - if (ret == -EROFS) {
> > - ret = 0;
> > - f2fs_stop_checkpoint(sbi, false,
> > - STOP_CP_REASON_SHUTDOWN);
> > - trace_f2fs_shutdown(sbi, in, ret);
> > - }
> > - return ret;
> > - }
> > - }
> > -
> > - switch (in) {
> > + switch (flag) {
> > case F2FS_GOING_DOWN_FULLSYNC:
> > ret = bdev_freeze(sb->s_bdev);
> > if (ret)
> > @@ -2292,6 +2271,9 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
> > goto out;
> > }
> > + if (readonly)
> > + goto out;
> > +
> > f2fs_stop_gc_thread(sbi);
> > f2fs_stop_discard_thread(sbi);
> > @@ -2300,10 +2282,44 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
> > f2fs_update_time(sbi, REQ_TIME);
> > out:
> > - if (in != F2FS_GOING_DOWN_FULLSYNC)
> > - mnt_drop_write_file(filp);
> > - trace_f2fs_shutdown(sbi, in, ret);
> > + trace_f2fs_shutdown(sbi, flag, ret);
> > +
> > + return ret;
> > +}
> > +
> > +static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
> > +{
> > + struct inode *inode = file_inode(filp);
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > + __u32 in;
> > + int ret;
> > + bool need_drop = false, readonly = false;
> > +
> > + if (!capable(CAP_SYS_ADMIN))
> > + return -EPERM;
> > +
> > + if (get_user(in, (__u32 __user *)arg))
> > + return -EFAULT;
> > +
> > + if (in != F2FS_GOING_DOWN_FULLSYNC) {
> > + ret = mnt_want_write_file(filp);
> > + if (ret) {
> > + if (ret != -EROFS)
> > + return ret;
> > +
> > + /* fallback to nosync shutdown for readonly fs */
> > + in = F2FS_GOING_DOWN_NOSYNC;
> > + readonly = true;
> > + } else {
> > + need_drop = true;
> > + }
> > + }
> > +
> > + ret = f2fs_do_shutdown(sbi, in, readonly);
> > +
> > + if (need_drop)
> > + mnt_drop_write_file(filp);
> > return ret;
> > }
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index 78a76583a4aa..0676c2dcbbf7 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -2547,6 +2547,11 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
> > return err;
> > }
> > +static void f2fs_shutdown(struct super_block *sb)
> > +{
> > + f2fs_do_shutdown(F2FS_SB(sb), F2FS_GOING_DOWN_NOSYNC, false);
> > +}
> > +
> > #ifdef CONFIG_QUOTA
> > static bool f2fs_need_recovery(struct f2fs_sb_info *sbi)
> > {
> > @@ -3146,6 +3151,7 @@ static const struct super_operations f2fs_sops = {
> > .unfreeze_fs = f2fs_unfreeze,
> > .statfs = f2fs_statfs,
> > .remount_fs = f2fs_remount,
> > + .shutdown = f2fs_shutdown,
> > };
> > #ifdef CONFIG_FS_ENCRYPTION
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