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authorLuck, Tony <tony.luck@intel.com>2011-03-19 01:33:43 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-21 23:50:05 +0300
commit366f7e7a79b19bd8c4e8f55fdf12b81538d1a7a4 (patch)
tree0c43335ab9e91ca895fdec82d1327cec16dcb645 /fs
parent10effcb548c170d59ea1d2152f2ee0ad45ce4c9d (diff)
downloadlinux-366f7e7a79b19bd8c4e8f55fdf12b81538d1a7a4.tar.xz
pstore: use mount option instead sysfs to tweak kmsg_bytes
/sys/fs is a somewhat strange way to tweak what could more obviously be tuned with a mount option. Suggested-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/pstore/inode.c68
-rw-r--r--fs/pstore/internal.h3
-rw-r--r--fs/pstore/platform.c16
3 files changed, 50 insertions, 37 deletions
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index f777f2902c49..977ed2723845 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -27,6 +27,7 @@
#include <linux/string.h>
#include <linux/mount.h>
#include <linux/ramfs.h>
+#include <linux/parser.h>
#include <linux/sched.h>
#include <linux/magic.h>
#include <linux/pstore.h>
@@ -112,10 +113,52 @@ static struct inode *pstore_get_inode(struct super_block *sb,
return inode;
}
+enum {
+ Opt_kmsg_bytes, Opt_err
+};
+
+static const match_table_t tokens = {
+ {Opt_kmsg_bytes, "kmsg_bytes=%u"},
+ {Opt_err, NULL}
+};
+
+static void parse_options(char *options)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+
+ if (!options)
+ return;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+
+ if (!*p)
+ continue;
+
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_kmsg_bytes:
+ if (!match_int(&args[0], &option))
+ pstore_set_kmsg_bytes(option);
+ break;
+ }
+ }
+}
+
+static int pstore_remount(struct super_block *sb, int *flags, char *data)
+{
+ parse_options(data);
+
+ return 0;
+}
+
static const struct super_operations pstore_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
.evict_inode = pstore_evict_inode,
+ .remount_fs = pstore_remount,
.show_options = generic_show_options,
};
@@ -215,6 +258,8 @@ int pstore_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &pstore_ops;
sb->s_time_gran = 1;
+ parse_options(data);
+
inode = pstore_get_inode(sb, NULL, S_IFDIR | 0755, 0);
if (!inode) {
err = -ENOMEM;
@@ -258,28 +303,7 @@ static struct file_system_type pstore_fs_type = {
static int __init init_pstore_fs(void)
{
- int rc = 0;
- struct kobject *pstorefs_kobj;
-
- pstorefs_kobj = kobject_create_and_add("pstore", fs_kobj);
- if (!pstorefs_kobj) {
- rc = -ENOMEM;
- goto done;
- }
-
- rc = sysfs_create_file(pstorefs_kobj, &pstore_kmsg_bytes_attr.attr);
- if (rc)
- goto done1;
-
- rc = register_filesystem(&pstore_fs_type);
- if (rc == 0)
- goto done;
-
- sysfs_remove_file(pstorefs_kobj, &pstore_kmsg_bytes_attr.attr);
-done1:
- kobject_put(pstorefs_kobj);
-done:
- return rc;
+ return register_filesystem(&pstore_fs_type);
}
module_init(init_pstore_fs)
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 76c26d2fab29..8c9f23eb1645 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -1,7 +1,6 @@
+extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(void);
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
char *data, size_t size,
struct timespec time, int (*erase)(u64));
extern int pstore_is_mounted(void);
-
-extern struct kobj_attribute pstore_kmsg_bytes_attr;
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 705fdf8abf6e..ce9ad84d5dd9 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -37,24 +37,14 @@
static DEFINE_SPINLOCK(pstore_lock);
static struct pstore_info *psinfo;
-/* How much of the console log to snapshot. /sys/fs/pstore/kmsg_bytes */
+/* How much of the console log to snapshot */
static unsigned long kmsg_bytes = 10240;
-static ssize_t b_show(struct kobject *kobj,
- struct kobj_attribute *attr, char *buf)
+void pstore_set_kmsg_bytes(int bytes)
{
- return snprintf(buf, PAGE_SIZE, "%lu\n", kmsg_bytes);
+ kmsg_bytes = bytes;
}
-static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
- const char *buf, size_t count)
-{
- return (sscanf(buf, "%lu", &kmsg_bytes) > 0) ? count : 0;
-}
-
-struct kobj_attribute pstore_kmsg_bytes_attr =
- __ATTR(kmsg_bytes, S_IRUGO | S_IWUSR, b_show, b_store);
-
/* Tag each group of saved records with a sequence number */
static int oopscount;