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ocfs2: De-magic the in-memory slot map.

Browse source 
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@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker 2008-02-01 12:04:48 -08:00 committed by Mark Fasheh
parent 1c8d9a6a33
commit fc881fa0d5
4 changed files with 77 additions and 63 deletions
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2
fs/ocfs2/journal.c
View file

@ -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;
};

6
fs/ocfs2/ocfs2.h
View file

@ -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;

130
fs/ocfs2/slot_map.c
View file

@ -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);

2
fs/ocfs2/slot_map.h
View file

@ -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