ocfs2: Make ocfs2_slot_info private.
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>
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 @@
/* 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
* 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 @@
__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 @@
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) {