2 files changed, 66 insertions, 9 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f6bca05a4b4c..8829f8099851 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2964,13 +2964,21 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 /* super.c */
 int btrfs_parse_options(struct btrfs_root *root, char *options);
 int btrfs_sync_fs(struct super_block *sb, int wait);
+void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
-                     unsigned int line, int errno);
+                     unsigned int line, int errno, const char *fmt, ...);
 
 #define btrfs_std_error(fs_info, errno)                         \
 do {                                                            \
         if ((errno))                                            \
-                __btrfs_std_error((fs_info), __func__, __LINE__, (errno));\
+                __btrfs_std_error((fs_info), __func__,          \
+                                   __LINE__, (errno), NULL);    \
+} while (0)
+
+#define btrfs_error(fs_info, errno, fmt, args...)               \
+do {                                                            \
+        __btrfs_std_error((fs_info), __func__, __LINE__,        \
+                          (errno), fmt, ##args);                \
 } while (0)
 
 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index ae7963b2d527..7fe69eef7607 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -127,25 +127,74 @@ static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
  * invokes the approciate error response.
  */
 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
-                     unsigned int line, int errno)
+                       unsigned int line, int errno, const char *fmt, ...)
 {
         struct super_block *sb = fs_info->sb;
         char nbuf[16];
         const char *errstr;
+        va_list args;
+        va_start(args, fmt);
 
         /*
          * Special case: if the error is EROFS, and we're already
          * under MS_RDONLY, then it is safe here.
          */
         if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
-                return;
+                return;
 
-        errstr = btrfs_decode_error(fs_info, errno, nbuf);
-        printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n",
-                sb->s_id, function, line, errstr);
-        save_error_info(fs_info);
+        errstr = btrfs_decode_error(fs_info, errno, nbuf);
+        if (fmt) {
+                struct va_format vaf = {
+                        .fmt = fmt,
+                        .va = &args,
+                };
+
+                printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s (%pV)\n",
+                        sb->s_id, function, line, errstr, &vaf);
+        } else {
+                printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n",
+                        sb->s_id, function, line, errstr);
+        }
+
+        /* Don't go through full error handling during mount */
+        if (sb->s_flags & MS_BORN) {
+                save_error_info(fs_info);
+                btrfs_handle_error(fs_info);
+        }
+        va_end(args);
+}
 
-        btrfs_handle_error(fs_info);
+const char *logtypes[] = {
+        "emergency",
+        "alert",
+        "critical",
+        "error",
+        "warning",
+        "notice",
+        "info",
+        "debug",
+};
+
+void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
+{
+        struct super_block *sb = fs_info->sb;
+        char lvl[4];
+        struct va_format vaf;
+        va_list args;
+        const char *type = logtypes[4];
+
+        va_start(args, fmt);
+
+        if (fmt[0] == '<' && isdigit(fmt[1]) && fmt[2] == '>') {
+                strncpy(lvl, fmt, 3);
+                fmt += 3;
+                type = logtypes[fmt[1] - '0'];
+        } else
+                *lvl = '\0';
+
+        vaf.fmt = fmt;
+        vaf.va = &args;
+        printk("%sBTRFS %s (device %s): %pV", lvl, type, sb->s_id, &vaf);
 }
 
 /*