[PATCH 05/62] ocfs2: De-magic the in-memory slot map.
From: Mark Fasheh
Date: Wed Apr 02 2008 - 16:20:07 EST
From: Joel Becker <joel.becker@xxxxxxxxxx>
The in-memory slot map uses the same magic as the on-disk one. There is
a special value to mark a slot as invalid. It relies on the size of
certain types and so on.
Write a new in-memory map that keeps validity as a separate field. Outside
of the I/O functions, OCFS2_INVALID_SLOT now means what it is supposed to.
It also is no longer tied to the type size.
This also means that only the I/O functions refer to 16bit quantities.
Signed-off-by: Joel Becker <joel.becker@xxxxxxxxxx>
Signed-off-by: Mark Fasheh <mfasheh@xxxxxxxx>
---
fs/ocfs2/journal.c | 2 +-
fs/ocfs2/ocfs2.h | 6 +-
fs/ocfs2/slot_map.c | 130 ++++++++++++++++++++++++++++-----------------------
fs/ocfs2/slot_map.h | 2 +-
4 files changed, 77 insertions(+), 63 deletions(-)
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index ca4c0ea..bffd2d7 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -71,7 +71,7 @@ static int ocfs2_commit_thread(void *arg);
*/
struct ocfs2_recovery_map {
- int rm_used;
+ unsigned int rm_used;
unsigned int *rm_entries;
};
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index c6ed8c3..95f783d 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -216,10 +216,10 @@ struct ocfs2_super
unsigned long s_mount_opt;
unsigned int s_atime_quantum;
- u16 max_slots;
+ unsigned int max_slots;
s16 node_num;
- s16 slot_num;
- s16 preferred_slot;
+ int slot_num;
+ int preferred_slot;
int s_sectsize_bits;
int s_clustersize;
int s_clustersize_bits;
diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index 5bddee1..65a61bf 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -42,21 +42,41 @@
#include "buffer_head_io.h"
+
+struct ocfs2_slot {
+ int sl_valid;
+ unsigned int sl_node_num;
+};
+
struct ocfs2_slot_info {
struct inode *si_inode;
unsigned int si_blocks;
struct buffer_head **si_bh;
unsigned int si_num_slots;
- unsigned int si_size;
- s16 si_global_node_nums[OCFS2_MAX_SLOTS];
+ struct ocfs2_slot *si_slots;
};
-static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
- s16 global);
-static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
- s16 slot_num,
- s16 node_num);
+static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
+ unsigned int node_num);
+
+static void ocfs2_invalidate_slot(struct ocfs2_slot_info *si,
+ int slot_num)
+{
+ BUG_ON((slot_num < 0) || (slot_num >= si->si_num_slots));
+ si->si_slots[slot_num].sl_valid = 0;
+}
+
+static void ocfs2_set_slot(struct ocfs2_slot_info *si,
+ int slot_num, unsigned int node_num)
+{
+ BUG_ON((slot_num < 0) || (slot_num >= si->si_num_slots));
+ BUG_ON((node_num == O2NM_INVALID_NODE_NUM) ||
+ (node_num >= O2NM_MAX_NODES));
+
+ si->si_slots[slot_num].sl_valid = 1;
+ si->si_slots[slot_num].sl_node_num = node_num;
+}
/*
* Post the slot information on disk into our slot_info struct.
@@ -71,8 +91,12 @@ static void ocfs2_update_slot_info(struct ocfs2_slot_info *si)
* should've made sure we have the most recent copy. */
disk_info = (__le16 *) si->si_bh[0]->b_data;
- for (i = 0; i < si->si_size; i++)
- si->si_global_node_nums[i] = le16_to_cpu(disk_info[i]);
+ for (i = 0; i < si->si_num_slots; i++) {
+ if (le16_to_cpu(disk_info[i]) == (u16)OCFS2_INVALID_SLOT)
+ ocfs2_invalidate_slot(si, i);
+ else
+ ocfs2_set_slot(si, i, le16_to_cpu(disk_info[i]));
+ }
}
int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
@@ -114,8 +138,13 @@ static int ocfs2_update_disk_slots(struct ocfs2_super *osb,
__le16 *disk_info = (__le16 *) si->si_bh[0]->b_data;
spin_lock(&osb->osb_lock);
- for (i = 0; i < si->si_size; i++)
- disk_info[i] = cpu_to_le16(si->si_global_node_nums[i]);
+ for (i = 0; i < si->si_num_slots; i++) {
+ if (si->si_slots[i].sl_valid)
+ disk_info[i] =
+ cpu_to_le16(si->si_slots[i].sl_node_num);
+ else
+ disk_info[i] = cpu_to_le16(OCFS2_INVALID_SLOT);
+ }
spin_unlock(&osb->osb_lock);
status = ocfs2_write_block(osb, si->si_bh[0], si->si_inode);
@@ -147,39 +176,39 @@ static int ocfs2_slot_map_physical_size(struct ocfs2_super *osb,
return 0;
}
-/* try to find global node in the slot info. Returns
- * OCFS2_INVALID_SLOT if nothing is found. */
-static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
- s16 global)
+/* try to find global node in the slot info. Returns -ENOENT
+ * if nothing is found. */
+static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
+ unsigned int node_num)
{
- int i;
- s16 ret = OCFS2_INVALID_SLOT;
+ int i, ret = -ENOENT;
for(i = 0; i < si->si_num_slots; i++) {
- if (global == si->si_global_node_nums[i]) {
- ret = (s16) i;
+ if (si->si_slots[i].sl_valid &&
+ (node_num == si->si_slots[i].sl_node_num)) {
+ ret = i;
break;
}
}
+
return ret;
}
-static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si,
- s16 preferred)
+static int __ocfs2_find_empty_slot(struct ocfs2_slot_info *si,
+ int preferred)
{
- int i;
- s16 ret = OCFS2_INVALID_SLOT;
+ int i, ret = -ENOSPC;
- if (preferred >= 0 && preferred < si->si_num_slots) {
- if (OCFS2_INVALID_SLOT == si->si_global_node_nums[preferred]) {
+ if ((preferred >= 0) && (preferred < si->si_num_slots)) {
+ if (!si->si_slots[preferred].sl_valid) {
ret = preferred;
goto out;
}
}
for(i = 0; i < si->si_num_slots; i++) {
- if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) {
- ret = (s16) i;
+ if (!si->si_slots[i].sl_valid) {
+ ret = i;
break;
}
}
@@ -189,16 +218,13 @@ out:
int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num)
{
- s16 slot;
+ int slot;
struct ocfs2_slot_info *si = osb->slot_info;
spin_lock(&osb->osb_lock);
slot = __ocfs2_node_num_to_slot(si, node_num);
spin_unlock(&osb->osb_lock);
- if (slot == OCFS2_INVALID_SLOT)
- return -ENOENT;
-
return slot;
}
@@ -212,10 +238,10 @@ int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
BUG_ON(slot_num < 0);
BUG_ON(slot_num > osb->max_slots);
- if (si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT)
+ if (!si->si_slots[slot_num].sl_valid)
return -ENOENT;
- *node_num = si->si_global_node_nums[slot_num];
+ *node_num = si->si_slots[slot_num].sl_node_num;
return 0;
}
@@ -241,19 +267,7 @@ static void __ocfs2_free_slot_info(struct ocfs2_slot_info *si)
kfree(si);
}
-static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
- s16 slot_num,
- s16 node_num)
-{
- BUG_ON(slot_num == OCFS2_INVALID_SLOT);
- BUG_ON(slot_num >= si->si_num_slots);
- BUG_ON((node_num != O2NM_INVALID_NODE_NUM) &&
- (node_num >= O2NM_MAX_NODES));
-
- si->si_global_node_nums[slot_num] = node_num;
-}
-
-int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num)
+int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num)
{
struct ocfs2_slot_info *si = osb->slot_info;
@@ -261,7 +275,7 @@ int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num)
return 0;
spin_lock(&osb->osb_lock);
- __ocfs2_fill_slot(si, slot_num, OCFS2_INVALID_SLOT);
+ ocfs2_invalidate_slot(si, slot_num);
spin_unlock(&osb->osb_lock);
return ocfs2_update_disk_slots(osb, osb->slot_info);
@@ -324,11 +338,13 @@ bail:
int ocfs2_init_slot_info(struct ocfs2_super *osb)
{
- int status, i;
+ int status;
struct inode *inode = NULL;
struct ocfs2_slot_info *si;
- si = kzalloc(sizeof(struct ocfs2_slot_info), GFP_KERNEL);
+ si = kzalloc(sizeof(struct ocfs2_slot_info) +
+ (sizeof(struct ocfs2_slot) * osb->max_slots),
+ GFP_KERNEL);
if (!si) {
status = -ENOMEM;
mlog_errno(status);
@@ -336,10 +352,8 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
}
si->si_num_slots = osb->max_slots;
- si->si_size = OCFS2_MAX_SLOTS;
-
- for(i = 0; i < si->si_num_slots; i++)
- si->si_global_node_nums[i] = OCFS2_INVALID_SLOT;
+ si->si_slots = (struct ocfs2_slot *)((char *)si +
+ sizeof(struct ocfs2_slot_info));
inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
@@ -375,7 +389,7 @@ void ocfs2_free_slot_info(struct ocfs2_super *osb)
int ocfs2_find_slot(struct ocfs2_super *osb)
{
int status;
- s16 slot;
+ int slot;
struct ocfs2_slot_info *si;
mlog_entry_void();
@@ -390,11 +404,11 @@ int ocfs2_find_slot(struct ocfs2_super *osb)
* own journal recovery? Possibly not, though we certainly
* need to warn to the user */
slot = __ocfs2_node_num_to_slot(si, osb->node_num);
- if (slot == OCFS2_INVALID_SLOT) {
+ if (slot < 0) {
/* if no slot yet, then just take 1st available
* one. */
slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
- if (slot == OCFS2_INVALID_SLOT) {
+ if (slot < 0) {
spin_unlock(&osb->osb_lock);
mlog(ML_ERROR, "no free slots available!\n");
status = -EINVAL;
@@ -404,7 +418,7 @@ int ocfs2_find_slot(struct ocfs2_super *osb)
mlog(ML_NOTICE, "slot %d is already allocated to this node!\n",
slot);
- __ocfs2_fill_slot(si, slot, osb->node_num);
+ ocfs2_set_slot(si, slot, osb->node_num);
osb->slot_num = slot;
spin_unlock(&osb->osb_lock);
@@ -430,7 +444,7 @@ void ocfs2_put_slot(struct ocfs2_super *osb)
spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);
- __ocfs2_fill_slot(si, osb->slot_num, OCFS2_INVALID_SLOT);
+ ocfs2_invalidate_slot(si, osb->slot_num);
osb->slot_num = OCFS2_INVALID_SLOT;
spin_unlock(&osb->osb_lock);
diff --git a/fs/ocfs2/slot_map.h b/fs/ocfs2/slot_map.h
index 5118e89..601c95f 100644
--- a/fs/ocfs2/slot_map.h
+++ b/fs/ocfs2/slot_map.h
@@ -39,6 +39,6 @@ int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num);
int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
unsigned int *node_num);
-int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num);
+int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num);
#endif
--
1.5.4.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/