ocfs2: Add dir_resv_level mount option

The default behavior for directory reservations stays the same, but we add a
mount option so people can tweak the size of directory reservations
according to their workloads.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 5745682eb1c0..79d7d4cf45b1 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -96,6 +96,7 @@ struct mount_options
         signed short    slot;
         int             localalloc_opt;
         unsigned int    resv_level;
+        int             dir_resv_level;
         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 };
 
@@ -178,6 +179,7 @@ enum {
         Opt_usrquota,
         Opt_grpquota,
         Opt_resv_level,
+        Opt_dir_resv_level,
         Opt_err,
 };
 
@@ -205,6 +207,7 @@ static const match_table_t tokens = {
         {Opt_usrquota, "usrquota"},
         {Opt_grpquota, "grpquota"},
         {Opt_resv_level, "resv_level=%u"},
+        {Opt_dir_resv_level, "dir_resv_level=%u"},
         {Opt_err, NULL}
 };
 
@@ -1034,6 +1037,11 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 
         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
         osb->osb_resv_level = parsed_options.resv_level;
+        osb->osb_dir_resv_level = parsed_options.resv_level;
+        if (parsed_options.dir_resv_level == -1)
+                osb->osb_dir_resv_level = parsed_options.resv_level;
+        else
+                osb->osb_dir_resv_level = parsed_options.dir_resv_level;
 
         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
         if (status)
@@ -1295,6 +1303,7 @@ static int ocfs2_parse_options(struct super_block *sb,
         mopt->localalloc_opt = -1;
         mopt->cluster_stack[0] = '\0';
         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
+        mopt->dir_resv_level = -1;
 
         if (!options) {
                 status = 1;
@@ -1449,6 +1458,17 @@ static int ocfs2_parse_options(struct super_block *sb,
                             option < OCFS2_MAX_RESV_LEVEL)
                                 mopt->resv_level = option;
                         break;
+                case Opt_dir_resv_level:
+                        if (is_remount)
+                                break;
+                        if (match_int(&args[0], &option)) {
+                                status = 0;
+                                goto bail;
+                        }
+                        if (option >= OCFS2_MIN_RESV_LEVEL &&
+                            option < OCFS2_MAX_RESV_LEVEL)
+                                mopt->dir_resv_level = option;
+                        break;
                 default:
                         mlog(ML_ERROR,
                              "Unrecognized mount option \"%s\" "
@@ -1533,6 +1553,9 @@ static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
 
+        if (osb->osb_dir_resv_level != osb->osb_resv_level)
+                seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
+
         return 0;
 }