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Subject[PATCH 02/62] ocfs2: Make ocfs2_slot_info private.
Date
From: Joel Becker <joel.becker@oracle.com>

Just use osb_lock around the ocfs2_slot_info data. This allows us to
take the ocfs2_slot_info structure private in slot_info.c. All access
is now via accessors.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/journal.c | 24 +++++++-------
fs/ocfs2/ocfs2.h | 1 +
fs/ocfs2/slot_map.c | 81 ++++++++++++++++++++++++++++++++++++---------------
fs/ocfs2/slot_map.h | 25 ++-------------
4 files changed, 74 insertions(+), 57 deletions(-)
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index c2e654e..ed0c6d0 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -1079,7 +1079,6 @@ static int ocfs2_recover_node(struct ocfs2_super *osb,
{
int status = 0;
int slot_num;
- struct ocfs2_slot_info *si = osb->slot_info;
struct ocfs2_dinode *la_copy = NULL;
struct ocfs2_dinode *tl_copy = NULL;

@@ -1092,8 +1091,8 @@ static int ocfs2_recover_node(struct ocfs2_super *osb,
* case we should've called ocfs2_journal_load instead. */
BUG_ON(osb->node_num == node_num);

- slot_num = ocfs2_node_num_to_slot(si, node_num);
- if (slot_num == OCFS2_INVALID_SLOT) {
+ slot_num = ocfs2_node_num_to_slot(osb, node_num);
+ if (slot_num == -ENOENT) {
status = 0;
mlog(0, "no slot for this node, so no recovery required.\n");
goto done;
@@ -1183,23 +1182,24 @@ bail:
* slot info struct has been updated from disk. */
int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
{
- int status, i, node_num;
- struct ocfs2_slot_info *si = osb->slot_info;
+ unsigned int node_num;
+ int status, i;

/* This is called with the super block cluster lock, so we
* know that the slot map can't change underneath us. */

- spin_lock(&si->si_lock);
- for(i = 0; i < si->si_num_slots; i++) {
+ spin_lock(&osb->osb_lock);
+ for (i = 0; i < osb->max_slots; i++) {
if (i == osb->slot_num)
continue;
- if (ocfs2_is_empty_slot(si, i))
+
+ status = ocfs2_slot_to_node_num_locked(osb, i, &node_num);
+ if (status == -ENOENT)
continue;

- node_num = si->si_global_node_nums[i];
if (ocfs2_node_map_test_bit(osb, &osb->recovery_map, node_num))
continue;
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

/* Ok, we have a slot occupied by another node which
* is not in the recovery map. We trylock his journal
@@ -1215,9 +1215,9 @@ int ocfs2_mark_dead_nodes(struct ocfs2_super *osb)
goto bail;
}

- spin_lock(&si->si_lock);
+ spin_lock(&osb->osb_lock);
}
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

status = 0;
bail:
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 6546cef..ee3f675 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -179,6 +179,7 @@ enum ocfs2_mount_options
#define OCFS2_DEFAULT_ATIME_QUANTUM 60

struct ocfs2_journal;
+struct ocfs2_slot_info;
struct ocfs2_super
{
struct task_struct *commit_task;
diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index f5727b8..762360d 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -42,13 +42,25 @@

#include "buffer_head_io.h"

+struct ocfs2_slot_info {
+ struct inode *si_inode;
+ struct buffer_head *si_bh;
+ unsigned int si_num_slots;
+ unsigned int si_size;
+ s16 si_global_node_nums[OCFS2_MAX_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);

-/* post the slot information on disk into our slot_info struct. */
+/*
+ * Post the slot information on disk into our slot_info struct.
+ * Must be protected by osb_lock.
+ */
static void ocfs2_update_slot_info(struct ocfs2_slot_info *si)
{
int i;
@@ -56,13 +68,10 @@ static void ocfs2_update_slot_info(struct ocfs2_slot_info *si)

/* we don't read the slot block here as ocfs2_super_lock
* should've made sure we have the most recent copy. */
- spin_lock(&si->si_lock);
disk_info = (__le16 *) si->si_bh->b_data;

for (i = 0; i < si->si_size; i++)
si->si_global_node_nums[i] = le16_to_cpu(disk_info[i]);
-
- spin_unlock(&si->si_lock);
}

int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
@@ -76,8 +85,11 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb)

bh = si->si_bh;
ret = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, si->si_inode);
- if (ret == 0)
+ if (ret == 0) {
+ spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);
+ spin_unlock(&osb->osb_lock);
+ }

return ret;
}
@@ -90,10 +102,10 @@ static int ocfs2_update_disk_slots(struct ocfs2_super *osb,
int status, i;
__le16 *disk_info = (__le16 *) si->si_bh->b_data;

- spin_lock(&si->si_lock);
+ 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]);
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

status = ocfs2_write_block(osb, si->si_bh, si->si_inode);
if (status < 0)
@@ -119,7 +131,8 @@ static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
return ret;
}

-static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si, s16 preferred)
+static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si,
+ s16 preferred)
{
int i;
s16 ret = OCFS2_INVALID_SLOT;
@@ -141,15 +154,36 @@ out:
return ret;
}

-s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
- s16 global)
+int ocfs2_node_num_to_slot(struct ocfs2_super *osb, unsigned int node_num)
{
- s16 ret;
+ s16 slot;
+ struct ocfs2_slot_info *si = osb->slot_info;

- spin_lock(&si->si_lock);
- ret = __ocfs2_node_num_to_slot(si, global);
- spin_unlock(&si->si_lock);
- return ret;
+ 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;
+}
+
+int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
+ unsigned int *node_num)
+{
+ struct ocfs2_slot_info *si = osb->slot_info;
+
+ assert_spin_locked(&osb->osb_lock);
+
+ BUG_ON(slot_num < 0);
+ BUG_ON(slot_num > osb->max_slots);
+
+ if (si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT)
+ return -ENOENT;
+
+ *node_num = si->si_global_node_nums[slot_num];
+ return 0;
}

static void __ocfs2_free_slot_info(struct ocfs2_slot_info *si)
@@ -184,9 +218,9 @@ int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num)
if (si == NULL)
return 0;

- spin_lock(&si->si_lock);
+ spin_lock(&osb->osb_lock);
__ocfs2_fill_slot(si, slot_num, OCFS2_INVALID_SLOT);
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

return ocfs2_update_disk_slots(osb, osb->slot_info);
}
@@ -206,7 +240,6 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
goto bail;
}

- spin_lock_init(&si->si_lock);
si->si_num_slots = osb->max_slots;
si->si_size = OCFS2_MAX_SLOTS;

@@ -235,7 +268,7 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)

si->si_inode = inode;
si->si_bh = bh;
- osb->slot_info = si;
+ osb->slot_info = (struct ocfs2_slot_info *)si;
bail:
if (status < 0 && si)
__ocfs2_free_slot_info(si);
@@ -261,9 +294,9 @@ int ocfs2_find_slot(struct ocfs2_super *osb)

si = osb->slot_info;

+ spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);

- spin_lock(&si->si_lock);
/* search for ourselves first and take the slot if it already
* exists. Perhaps we need to mark this in a variable for our
* own journal recovery? Possibly not, though we certainly
@@ -274,7 +307,7 @@ int ocfs2_find_slot(struct ocfs2_super *osb)
* one. */
slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
if (slot == OCFS2_INVALID_SLOT) {
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);
mlog(ML_ERROR, "no free slots available!\n");
status = -EINVAL;
goto bail;
@@ -285,7 +318,7 @@ int ocfs2_find_slot(struct ocfs2_super *osb)

__ocfs2_fill_slot(si, slot, osb->node_num);
osb->slot_num = slot;
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

mlog(0, "taking node slot %d\n", osb->slot_num);

@@ -306,12 +339,12 @@ void ocfs2_put_slot(struct ocfs2_super *osb)
if (!si)
return;

+ spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);

- spin_lock(&si->si_lock);
__ocfs2_fill_slot(si, osb->slot_num, OCFS2_INVALID_SLOT);
osb->slot_num = OCFS2_INVALID_SLOT;
- spin_unlock(&si->si_lock);
+ spin_unlock(&osb->osb_lock);

status = ocfs2_update_disk_slots(osb, si);
if (status < 0) {
diff --git a/fs/ocfs2/slot_map.h b/fs/ocfs2/slot_map.h
index b029ffd..5118e89 100644
--- a/fs/ocfs2/slot_map.h
+++ b/fs/ocfs2/slot_map.h
@@ -27,16 +27,6 @@
#ifndef SLOTMAP_H
#define SLOTMAP_H

-struct ocfs2_slot_info {
- spinlock_t si_lock;
-
- struct inode *si_inode;
- struct buffer_head *si_bh;
- unsigned int si_num_slots;
- unsigned int si_size;
- s16 si_global_node_nums[OCFS2_MAX_SLOTS];
-};
-
int ocfs2_init_slot_info(struct ocfs2_super *osb);
void ocfs2_free_slot_info(struct ocfs2_super *osb);

@@ -45,17 +35,10 @@ void ocfs2_put_slot(struct ocfs2_super *osb);

int ocfs2_refresh_slot_info(struct ocfs2_super *osb);

-s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
- s16 global);
-int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num);
+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);

-static inline int ocfs2_is_empty_slot(struct ocfs2_slot_info *si,
- int slot_num)
-{
- BUG_ON(slot_num == OCFS2_INVALID_SLOT);
- assert_spin_locked(&si->si_lock);
-
- return si->si_global_node_nums[slot_num] == OCFS2_INVALID_SLOT;
-}
+int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num);

#endif
--
1.5.4.1


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