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Date: Mon, 29 May 2017 11:24:44 +0900 From: Hyunchul Lee <hyc.lee@...il.com> To: Richard Weinberger <richard@....at> Cc: Artem Bityutskiy <dedekind1@...il.com>, adrian.hunter@...el.com, linux-kernel@...r.kernel.org, kernel-team@....com, linux-mtd@...ts.infradead.org, linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@...radead.org> Subject: Re: [PATCH] ubifs: Add freeze support Hi, Richard. On Mon, May 29, 2017 at 09:43:46AM +0900, Hyunchul Lee wrote: > On Sat, May 27, 2017 at 01:23:38AM -0700, Christoph Hellwig wrote: > > > +static int ubifs_freeze_super(struct super_block *sb) > > > +{ > > > + struct ubifs_info *c = sb->s_fs_info; > > > + int err; > > > + > > > + dbg_gen("starting"); > > > + /* freeze_super always succeeds if file system is in read-only. > > > + * however if there are errors, UBIFS is switched to read-only mode. > > > + * so @ro_error should be checked. > > > + */ > > > + err = freeze_super(sb); > > > + if (!err && c->ro_error) { > > > + thaw_super(sb); > > > + return -EIO; > > > + } > > > + return err; > > > > This is just broken. First ubifs should still properly propagate > > the errors, and second freezing/unfreezing read only file systems is > > perfectly valid, > > it is right. if updating TNC is failed, ubifs might become inconsistant and be switched to read-only mode. for example, when ubifs_jnl_update is called to create a file, if inserting a znode for new inode is failed, TNC has only a znode for new dentry. and this can be only recoverd by replay. is it required to fix this? > > > and third the freeze_super method is a special > > hack for gfs2 that should not gain additional users. > > I thought that it was ok. because commit 48b6bca says "every filesystem > that implements this hooks must call the vfs freeze_super ..." > > Thank you for comment. > > > > ______________________________________________________ > > Linux MTD discussion mailing list > > http://lists.infradead.org/mailman/listinfo/linux-mtd/ > > -- > > Thanks, > Hyunchul -- Thanks, Hyunchul
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