mount options: fix udf

Add a .show_options super operation to udf.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 72 insertions, 4 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 3afe7647f94a..f3ac4abfc946 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -53,6 +53,8 @@
 #include <linux/vfs.h>
 #include <linux/vmalloc.h>
 #include <linux/errno.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
 #include <asm/byteorder.h>
 
 #include <linux/udf_fs.h>
@@ -71,6 +73,8 @@
 #define VDS_POS_TERMINATING_DESC        6
 #define VDS_POS_LENGTH                  7
 
+#define UDF_DEFAULT_BLOCKSIZE 2048
+
 static char error_buf[1024];
 
 /* These are the "meat" - everything else is stuffing */
@@ -95,6 +99,7 @@ static void udf_open_lvid(struct super_block *);
 static void udf_close_lvid(struct super_block *);
 static unsigned int udf_count_free(struct super_block *);
 static int udf_statfs(struct dentry *, struct kstatfs *);
+static int udf_show_options(struct seq_file *, struct vfsmount *);
 
 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
 {
@@ -181,6 +186,7 @@ static const struct super_operations udf_sb_ops = {
         .write_super    = udf_write_super,
         .statfs         = udf_statfs,
         .remount_fs     = udf_remount_fs,
+        .show_options   = udf_show_options,
 };
 
 struct udf_options {
@@ -247,6 +253,61 @@ static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
         return 0;
 }
 
+static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
+{
+        struct super_block *sb = mnt->mnt_sb;
+        struct udf_sb_info *sbi = UDF_SB(sb);
+
+        if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
+                seq_puts(seq, ",nostrict");
+        if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
+                seq_printf(seq, ",bs=%lu", sb->s_blocksize);
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+                seq_puts(seq, ",unhide");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+                seq_puts(seq, ",undelete");
+        if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
+                seq_puts(seq, ",noadinicb");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
+                seq_puts(seq, ",shortad");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
+                seq_puts(seq, ",uid=forget");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
+                seq_puts(seq, ",uid=ignore");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
+                seq_puts(seq, ",gid=forget");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
+                seq_puts(seq, ",gid=ignore");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
+                seq_printf(seq, ",uid=%u", sbi->s_uid);
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
+                seq_printf(seq, ",gid=%u", sbi->s_gid);
+        if (sbi->s_umask != 0)
+                seq_printf(seq, ",umask=%o", sbi->s_umask);
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
+                seq_printf(seq, ",session=%u", sbi->s_session);
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
+                seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
+        /*
+         * s_anchor[2] could be zeroed out in case there is no anchor
+         * in the specified block, but then the "anchor=N" option
+         * originally given by the user wasn't effective, so it's OK
+         * if we don't show it.
+         */
+        if (sbi->s_anchor[2] != 0)
+                seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
+        /*
+         * volume, partition, fileset and rootdir seem to be ignored
+         * currently
+         */
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
+                seq_puts(seq, ",utf8");
+        if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
+                seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
+
+        return 0;
+}
+
 /*
  * udf_parse_options
  *
@@ -339,13 +400,14 @@ static match_table_t tokens = {
         {Opt_err,       NULL}
 };
 
-static int udf_parse_options(char *options, struct udf_options *uopt)
+static int udf_parse_options(char *options, struct udf_options *uopt,
+                             bool remount)
 {
         char *p;
         int option;
 
         uopt->novrs = 0;
-        uopt->blocksize = 2048;
+        uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
         uopt->partition = 0xFFFF;
         uopt->session = 0xFFFFFFFF;
         uopt->lastblock = 0;
@@ -415,11 +477,15 @@ static int udf_parse_options(char *options, struct udf_options *uopt)
                         if (match_int(args, &option))
                                 return 0;
                         uopt->session = option;
+                        if (!remount)
+                                uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
                         break;
                 case Opt_lastblock:
                         if (match_int(args, &option))
                                 return 0;
                         uopt->lastblock = option;
+                        if (!remount)
+                                uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
                         break;
                 case Opt_anchor:
                         if (match_int(args, &option))
@@ -497,7 +563,7 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
         uopt.gid   = sbi->s_gid;
         uopt.umask = sbi->s_umask;
 
-        if (!udf_parse_options(options, &uopt))
+        if (!udf_parse_options(options, &uopt, true))
                 return -EINVAL;
 
         sbi->s_flags = uopt.flags;
@@ -1679,7 +1745,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 
         mutex_init(&sbi->s_alloc_mutex);
 
-        if (!udf_parse_options((char *)options, &uopt))
+        if (!udf_parse_options((char *)options, &uopt, false))
                 goto error_out;
 
         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index d9adb0fff84c..737d1c604eea 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -26,6 +26,8 @@
 #define UDF_FLAG_GID_IGNORE     14
 #define UDF_FLAG_UID_SET        15
 #define UDF_FLAG_GID_SET        16
+#define UDF_FLAG_SESSION_SET    17
+#define UDF_FLAG_LASTBLOCK_SET  18
 
 #define UDF_PART_FLAG_UNALLOC_BITMAP    0x0001
 #define UDF_PART_FLAG_UNALLOC_TABLE     0x0002