Messages in this thread | | | Date | Mon, 11 May 2009 17:37:18 -0500 | From | "Serge E. Hallyn" <> | Subject | Re: [v3][PATCH 5/5] Merge code for singleandmultiple-instancemounts |
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Quoting Sukadev Bhattiprolu (sukadev@linux.vnet.ibm.com): ...
> >From 2f7746f4df78ff57125c4714f0cd64e739ccf804 Mon Sep 17 00:00:00 2001 > From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> > Date: Mon, 11 May 2009 13:11:11 -0700 > Subject: [PATCH] devpts: Correctly set default options > > devpts_get_sb() calls memset(0) to clear mount options and calls > parse_mount_options() if user specified any mount options. The memset(0) is > bogus since the 'mode' and 'ptmxmode' options are non-zero by default. > parse_mount_options() restores options to default anyway and can properly deal > with NULL mount options. > > So in devpts_get_sb() remove memset(0) and call parse_mount_options() even for > NULL mount options. > > Bug reported by Eric Paris: http://lkml.org/lkml/2009/5/7/448.
Would you almost say... Reported-by: ? :) > > Signed-off-by: Sukadev Bhattiprolu (sukadev@us.ibm.com)
Looks good.
Acked-by: Serge Hallyn <serue@us.ibm.com>
> --- > fs/devpts/inode.c | 18 ++++++++++++------ > 1 files changed, 12 insertions(+), 6 deletions(-) > > diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c > index 63a4a59..b7a954e 100644 > --- a/fs/devpts/inode.c > +++ b/fs/devpts/inode.c > @@ -90,6 +90,15 @@ static inline struct super_block *pts_sb_from_inode(struct inode *inode) > #define PARSE_MOUNT 0 > #define PARSE_REMOUNT 1 > > +/* > + * parse_mount_options(): > + * Set @opts to mount options specified in @data. If an option is not > + * specified in @data, set it to its default value. The exception is > + * 'newinstance' option which can only be set/cleared on a mount (i.e. > + * cannot be changed during remount). > + * > + * Note: @data may be NULL (in which case all options are set to default). > + */ > static int parse_mount_options(char *data, int op, struct pts_mount_opts *opts) > { > char *p; > @@ -355,12 +364,9 @@ static int devpts_get_sb(struct file_system_type *fs_type, > struct pts_mount_opts opts; > struct super_block *s; > > - memset(&opts, 0, sizeof(opts)); > - if (data) { > - error = parse_mount_options(data, PARSE_MOUNT, &opts); > - if (error) > - return error; > - } > + error = parse_mount_options(data, PARSE_MOUNT, &opts); > + if (error) > + return error; > > if (opts.newinstance) > s = sget(fs_type, NULL, set_anon_super, NULL);
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