From 349d743895e2371bda9a02a5b465b50cc24d2825 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 5 Jul 2017 16:24:34 +0100 Subject: [PATCH] pstore: Implement show_options Implement the show_options superblock op for pstore as part of a bid to get rid of s_options and generic_show_options() to make it easier to implement a context-based mount where the mount options can be passed individually over a file descriptor. Signed-off-by: David Howells cc: Kees Cook cc: Anton Vorontsov cc: Colin Cross cc: Tony Luck Signed-off-by: Al Viro --- fs/pstore/inode.c | 14 +++++++++++--- fs/pstore/internal.h | 3 +++ fs/pstore/platform.c | 2 +- 3 files changed, 15 insertions(+), 4 deletions(-) diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c index 792a4e5f9226..913e839ac1f5 100644 --- a/fs/pstore/inode.c +++ b/fs/pstore/inode.c @@ -283,6 +283,16 @@ static void parse_options(char *options) } } +/* + * Display the mount options in /proc/mounts. + */ +static int pstore_show_options(struct seq_file *m, struct dentry *root) +{ + if (kmsg_bytes != PSTORE_DEFAULT_KMSG_BYTES) + seq_printf(m, ",kmsg_bytes=%lu", kmsg_bytes); + return 0; +} + static int pstore_remount(struct super_block *sb, int *flags, char *data) { sync_filesystem(sb); @@ -296,7 +306,7 @@ static const struct super_operations pstore_ops = { .drop_inode = generic_delete_inode, .evict_inode = pstore_evict_inode, .remount_fs = pstore_remount, - .show_options = generic_show_options, + .show_options = pstore_show_options, }; static struct super_block *pstore_sb; @@ -448,8 +458,6 @@ static int pstore_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; - save_mount_options(sb, data); - pstore_sb = sb; sb->s_maxbytes = MAX_LFS_FILESIZE; diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h index c416e653dc4f..4d5913130580 100644 --- a/fs/pstore/internal.h +++ b/fs/pstore/internal.h @@ -5,6 +5,9 @@ #include #include +#define PSTORE_DEFAULT_KMSG_BYTES 10240 +extern unsigned long kmsg_bytes; + #ifdef CONFIG_PSTORE_FTRACE extern void pstore_register_ftrace(void); extern void pstore_unregister_ftrace(void); diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index d468eec9b8a6..6640df40908d 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -99,7 +99,7 @@ static char *big_oops_buf; static size_t big_oops_buf_sz; /* How much of the console log to snapshot */ -static unsigned long kmsg_bytes = 10240; +unsigned long kmsg_bytes = PSTORE_DEFAULT_KMSG_BYTES; void pstore_set_kmsg_bytes(int bytes) { -- 2.20.1