[{"id":3644717,"web_url":"http://patchwork.ozlabs.org/comment/3644717/","msgid":"","list_archive_url":null,"date":"2026-02-02T16:40:45","subject":"Re: [PATCH 1/3] jbd2: use READ_ONCE for lockless jinode reads","submitter":{"id":363,"url":"http://patchwork.ozlabs.org/api/people/363/","name":"Jan Kara","email":"jack@suse.cz"},"content":"On Fri 30-01-26 11:12:30, Li Chen wrote:\n> jbd2_inode fields are updated under journal->j_list_lock, but some\n> paths read them without holding the lock (e.g. fast commit\n> helpers and the ordered truncate fast path).\n> \n> Use READ_ONCE() for these lockless reads to correct the\n> concurrency assumptions.\n> \n> Suggested-by: Jan Kara \n> Signed-off-by: Li Chen \n\nJust one nit below. With that fixed feel free to add:\n\nReviewed-by: Jan Kara \n\n> @@ -191,12 +197,30 @@ EXPORT_SYMBOL(jbd2_submit_inode_data);\n> \n> int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode)\n> {\n> -\tif (!jinode || !(jinode->i_flags & JI_WAIT_DATA) ||\n> -\t\t!jinode->i_vfs_inode || !jinode->i_vfs_inode->i_mapping)\n> +\tstruct address_space *mapping;\n> +\tstruct inode *inode;\n> +\tunsigned long flags;\n> +\tloff_t start, end;\n> +\n> +\tif (!jinode)\n> +\t\treturn 0;\n> +\n> +\tflags = READ_ONCE(jinode->i_flags);\n> +\tif (!(flags & JI_WAIT_DATA))\n> +\t\treturn 0;\n> +\n> +\tinode = READ_ONCE(jinode->i_vfs_inode);\n\ni_vfs_inode never changes so READ_ONCE is pointless here.\n\n\t\t\t\t\t\t\t\tHonza","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=G+EKVc0S;\n\tdkim=pass header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=qoN0Xq5n;\n\tdkim=pass (1024-bit key) header.d=suse.cz header.i=@suse.cz\n header.a=rsa-sha256 header.s=susede2_rsa header.b=v6qU8fZ4;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=6z6fR6kH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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With that fixed feel free to add:\n> \n> Reviewed-by: Jan Kara \n> \n> > @@ -191,12 +197,30 @@ EXPORT_SYMBOL(jbd2_submit_inode_data);\n> > \n> > int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode)\n> > {\n> > -\tif (!jinode || !(jinode->i_flags & JI_WAIT_DATA) ||\n> > -\t\t!jinode->i_vfs_inode || !jinode->i_vfs_inode->i_mapping)\n> > +\tstruct address_space *mapping;\n> > +\tstruct inode *inode;\n> > +\tunsigned long flags;\n> > +\tloff_t start, end;\n> > +\n> > +\tif (!jinode)\n> > +\t\treturn 0;\n> > +\n> > +\tflags = READ_ONCE(jinode->i_flags);\n> > +\tif (!(flags & JI_WAIT_DATA))\n> > +\t\treturn 0;\n> > +\n> > +\tinode = READ_ONCE(jinode->i_vfs_inode);\n> \n> i_vfs_inode never changes so READ_ONCE is pointless here.\n\nOne more note: I've realized that for this to work you also need to make\njbd2_journal_file_inode() use WRITE_ONCE() when updating i_dirty_start,\ni_dirty_end and i_flags.\n\n\t\t\t\t\t\t\t\tHonza","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=1/CDKOvJ;\n\tdkim=pass header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=SjihoiF4;\n\tdkim=pass (1024-bit key) header.d=suse.cz header.i=@suse.cz\n header.a=rsa-sha256 header.s=susede2_rsa header.b=bI/nppYE;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=Yx/TCFoJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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