6 files changed, 62 insertions, 14 deletions

diff --git a/Documentation/filesystems/ocfs2.txt b/Documentation/filesystems/ocfs2.txt
index b63bd2d7fcd..071fad137eb 100644
--- a/Documentation/filesystems/ocfs2.txt
+++ b/Documentation/filesystems/ocfs2.txt
@@ -72,3 +72,6 @@ commit=nrsec	(*)	Ocfs2 can be told to sync all its data and metadata
                         it at the default (5 seconds).
                         Setting it to very large values will improve
                         performance.
+localalloc=8(*)         Allows custom localalloc size in MB. If the value is too
+                        large, the fs will silently revert it to the default.
+                        Localalloc is not enabled for local mounts.
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 0de0792fce7..add1ffdc5c6 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -75,18 +75,12 @@ static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
 static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
                                           struct inode *local_alloc_inode);
 
-/*
- * Determine how large our local alloc window should be, in bits.
- *
- * These values (and the behavior in ocfs2_alloc_should_use_local) have
- * been chosen so that most allocations, including new block groups go
- * through local alloc.
- */
 static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
 {
-        BUG_ON(osb->s_clustersize_bits < 12);
+        BUG_ON(osb->s_clustersize_bits > 20);
 
-        return 2048 >> (osb->s_clustersize_bits - 12);
+        /* Size local alloc windows by the megabyte */
+        return osb->local_alloc_size << (20 - osb->s_clustersize_bits);
 }
 
 /*
@@ -96,18 +90,23 @@ static inline int ocfs2_local_alloc_window_bits(struct ocfs2_super *osb)
 int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
 {
         int la_bits = ocfs2_local_alloc_window_bits(osb);
+        int ret = 0;
 
         if (osb->local_alloc_state != OCFS2_LA_ENABLED)
-                return 0;
+                goto bail;
 
         /* la_bits should be at least twice the size (in clusters) of
          * a new block group. We want to be sure block group
          * allocations go through the local alloc, so allow an
          * allocation to take up to half the bitmap. */
         if (bits > (la_bits / 2))
-                return 0;
+                goto bail;
 
-        return 1;
+        ret = 1;
+bail:
+        mlog(0, "state=%d, bits=%llu, la_bits=%d, ret=%d\n",
+             osb->local_alloc_state, (unsigned long long)bits, la_bits, ret);
+        return ret;
 }
 
 int ocfs2_load_local_alloc(struct ocfs2_super *osb)
@@ -121,6 +120,19 @@ int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 
         mlog_entry_void();
 
+        if (ocfs2_mount_local(osb))
+                goto bail;
+
+        if (osb->local_alloc_size == 0)
+                goto bail;
+
+        if (ocfs2_local_alloc_window_bits(osb) >= osb->bitmap_cpg) {
+                mlog(ML_NOTICE, "Requested local alloc window %d is larger "
+                     "than max possible %u. Using defaults.\n",
+                     ocfs2_local_alloc_window_bits(osb), (osb->bitmap_cpg - 1));
+                osb->local_alloc_size = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
+        }
+
         /* read the alloc off disk */
         inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
                                             osb->slot_num);
@@ -181,6 +193,9 @@ bail:
         if (inode)
                 iput(inode);
 
+        mlog(0, "Local alloc window bits = %d\n",
+             ocfs2_local_alloc_window_bits(osb));
+
         mlog_exit(status);
         return status;
 }
@@ -521,6 +536,9 @@ bail:
                 iput(local_alloc_inode);
         }
 
+        mlog(0, "bits=%d, slot=%d, ret=%d\n", bits_wanted, osb->slot_num,
+             status);
+
         mlog_exit(status);
         return status;
 }
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 82802f5672a..d12bd7036da 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -231,6 +231,7 @@ struct ocfs2_super
         struct ocfs2_journal *journal;
         unsigned long osb_commit_interval;
 
+        int local_alloc_size;
         enum ocfs2_local_alloc_state local_alloc_state;
         struct buffer_head *local_alloc_bh;
         u64 la_last_gd;
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index 425551737f1..3633edd3982 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -270,6 +270,14 @@ struct ocfs2_new_group_input {
 /* Journal limits (in bytes) */
 #define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
 
+/*
+ * Default local alloc size (in megabytes)
+ *
+ * The value chosen should be such that most allocations, including new
+ * block groups, use local alloc.
+ */
+#define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE  8
+
 struct ocfs2_system_inode_info {
         char    *si_name;
         int     si_iflags;
diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 4391744e80f..7e397e2c25d 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1516,8 +1516,9 @@ int __ocfs2_claim_clusters(struct ocfs2_super *osb,
                 if (min_clusters > (osb->bitmap_cpg - 1)) {
                         /* The only paths asking for contiguousness
                          * should know about this already. */
-                        mlog(ML_ERROR, "minimum allocation requested exceeds "
-                                       "group bitmap size!");
+                        mlog(ML_ERROR, "minimum allocation requested %u exceeds "
+                             "group bitmap size %u!\n", min_clusters,
+                             osb->bitmap_cpg);
                         status = -ENOSPC;
                         goto bail;
                 }
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 8044ed97d36..1104f14c318 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -87,6 +87,7 @@ struct mount_options
         unsigned long   mount_opt;
         unsigned int    atime_quantum;
         signed short    slot;
+        unsigned int    localalloc_opt;
 };
 
 static int ocfs2_parse_options(struct super_block *sb, char *options,
@@ -151,6 +152,7 @@ enum {
         Opt_atime_quantum,
         Opt_slot,
         Opt_commit,
+        Opt_localalloc,
         Opt_err,
 };
 
@@ -167,6 +169,7 @@ static match_table_t tokens = {
         {Opt_atime_quantum, "atime_quantum=%u"},
         {Opt_slot, "preferred_slot=%u"},
         {Opt_commit, "commit=%u"},
+        {Opt_localalloc, "localalloc=%d"},
         {Opt_err, NULL}
 };
 
@@ -602,6 +605,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
         osb->s_atime_quantum = parsed_options.atime_quantum;
         osb->preferred_slot = parsed_options.slot;
         osb->osb_commit_interval = parsed_options.commit_interval;
+        osb->local_alloc_size = parsed_options.localalloc_opt;
 
         sb->s_magic = OCFS2_SUPER_MAGIC;
 
@@ -756,6 +760,7 @@ static int ocfs2_parse_options(struct super_block *sb,
         mopt->mount_opt = 0;
         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
         mopt->slot = OCFS2_INVALID_SLOT;
+        mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 
         if (!options) {
                 status = 1;
@@ -834,6 +839,15 @@ static int ocfs2_parse_options(struct super_block *sb,
                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
                         mopt->commit_interval = HZ * option;
                         break;
+                case Opt_localalloc:
+                        option = 0;
+                        if (match_int(&args[0], &option)) {
+                                status = 0;
+                                goto bail;
+                        }
+                        if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
+                                mopt->localalloc_opt = option;
+                        break;
                 default:
                         mlog(ML_ERROR,
                              "Unrecognized mount option \"%s\" "
@@ -886,6 +900,9 @@ static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
                 seq_printf(s, ",commit=%u",
                            (unsigned) (osb->osb_commit_interval / HZ));
 
+        if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
+                seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
+
         return 0;
 }