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pstore: Implement show_options

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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 <dhowells@redhat.com>
cc: Kees Cook <keescook@chromium.org>
cc: Anton Vorontsov <anton@enomsg.org>
cc: Colin Cross <ccross@android.com>
cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2017-07-05 16:24:34 +01:00 committed by Al Viro
parent d86efb0df9
commit 349d743895
3 changed files with 15 additions and 4 deletions
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14
fs/pstore/inode.c
View File

@ -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;

3
fs/pstore/internal.h
View File

@ -5,6 +5,9 @@
#include <linux/time.h>
#include <linux/pstore.h>
#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);

2
fs/pstore/platform.c
View File

@ -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)
{