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authorDavid Howells <dhowells@redhat.com>2017-07-05 16:24:34 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-06 03:31:46 -0400
commit349d743895e2371bda9a02a5b465b50cc24d2825 (patch)
tree5a9ff4a63bf70603842b00e079b4fe6f25451e01
parentd86efb0df98afe0acdda7ed94963684c3fa7cccd (diff)
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 <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>
-rw-r--r--fs/pstore/inode.c14
-rw-r--r--fs/pstore/internal.h3
-rw-r--r--fs/pstore/platform.c2
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 <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);
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)
{