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authorSunil Mushran <sunil.mushran@oracle.com>2007-12-20 14:58:11 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2008-01-25 15:05:43 -0800
commit2fbe8d1ebe004425b4f7b8bba345623d2280be82 (patch)
tree7620954c7a364c41306a3becc0046dd1e235158f
parentd147b3d630edef1d34de6ea819787a1ac1b8603b (diff)
ocfs2: Local alloc window size changeable via mount option
Local alloc is a performance optimization in ocfs2 in which a node takes a window of bits from the global bitmap and then uses that for all small local allocations. This window size is fixed to 8MB currently. This patch allows users to specify the window size in MB including disabling it by passing in 0. If the number specified is too large, the fs will use the default value of 8MB. mount -o localalloc=X /dev/sdX /mntpoint Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
-rw-r--r--Documentation/filesystems/ocfs2.txt3
-rw-r--r--fs/ocfs2/localalloc.c42
-rw-r--r--fs/ocfs2/ocfs2.h1
-rw-r--r--fs/ocfs2/ocfs2_fs.h8
-rw-r--r--fs/ocfs2/suballoc.c5
-rw-r--r--fs/ocfs2/super.c17
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;
}