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ocfs2: slot_map I/O based on max_slots.

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The slot map code assumed a slot_map file has one block allocated.
This changes the code to I/O as many blocks as will cover max_slots.

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 11:59:07 -08:00 committed by Mark Fasheh
parent 553abd046a
commit 1c8d9a6a33
1 changed files with 112 additions and 24 deletions
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136
fs/ocfs2/slot_map.c
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@ -44,7 +44,8 @@
struct ocfs2_slot_info {
struct inode *si_inode;
struct buffer_head *si_bh;
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];
@ -68,7 +69,7 @@ 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. */
disk_info = (__le16 *) si->si_bh->b_data;
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]);
@ -78,13 +79,23 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb)
{
int ret;
struct ocfs2_slot_info *si = osb->slot_info;
struct buffer_head *bh;
if (si == NULL)
return 0;
bh = si->si_bh;
ret = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, si->si_inode);
BUG_ON(si->si_blocks == 0);
BUG_ON(si->si_bh == NULL);
mlog(0, "Refreshing slot map, reading %u block(s)\n",
si->si_blocks);
/*
* We pass -1 as blocknr because we expect all of si->si_bh to
* be !NULL. Thus, ocfs2_read_blocks() will ignore blocknr. If
* this is not true, the read of -1 (UINT64_MAX) will fail.
*/
ret = ocfs2_read_blocks(osb, -1, si->si_blocks, si->si_bh, 0,
si->si_inode);
if (ret == 0) {
spin_lock(&osb->osb_lock);
ocfs2_update_slot_info(si);
@ -100,20 +111,42 @@ static int ocfs2_update_disk_slots(struct ocfs2_super *osb,
struct ocfs2_slot_info *si)
{
int status, i;
__le16 *disk_info = (__le16 *) si->si_bh->b_data;
__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]);
spin_unlock(&osb->osb_lock);
status = ocfs2_write_block(osb, si->si_bh, si->si_inode);
status = ocfs2_write_block(osb, si->si_bh[0], si->si_inode);
if (status < 0)
mlog_errno(status);
return status;
}
/*
* Calculate how many bytes are needed by the slot map. Returns
* an error if the slot map file is too small.
*/
static int ocfs2_slot_map_physical_size(struct ocfs2_super *osb,
struct inode *inode,
unsigned long long *bytes)
{
unsigned long long bytes_needed;
bytes_needed = osb->max_slots * sizeof(__le16);
if (bytes_needed > i_size_read(inode)) {
mlog(ML_ERROR,
"Slot map file is too small! (size %llu, needed %llu)\n",
i_size_read(inode), bytes_needed);
return -ENOSPC;
}
*bytes = bytes_needed;
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,
@ -188,13 +221,22 @@ int ocfs2_slot_to_node_num_locked(struct ocfs2_super *osb, int slot_num,
static void __ocfs2_free_slot_info(struct ocfs2_slot_info *si)
{
unsigned int i;
if (si == NULL)
return;
if (si->si_inode)
iput(si->si_inode);
if (si->si_bh)
brelse(si->si_bh);
if (si->si_bh) {
for (i = 0; i < si->si_blocks; i++) {
if (si->si_bh[i]) {
brelse(si->si_bh[i]);
si->si_bh[i] = NULL;
}
}
kfree(si->si_bh);
}
kfree(si);
}
@ -225,12 +267,65 @@ int ocfs2_clear_slot(struct ocfs2_super *osb, s16 slot_num)
return ocfs2_update_disk_slots(osb, osb->slot_info);
}
static int ocfs2_map_slot_buffers(struct ocfs2_super *osb,
struct ocfs2_slot_info *si)
{
int status = 0;
u64 blkno;
unsigned long long blocks, bytes;
unsigned int i;
struct buffer_head *bh;
status = ocfs2_slot_map_physical_size(osb, si->si_inode, &bytes);
if (status)
goto bail;
blocks = ocfs2_blocks_for_bytes(si->si_inode->i_sb, bytes);
BUG_ON(blocks > UINT_MAX);
si->si_blocks = blocks;
if (!si->si_blocks)
goto bail;
mlog(0, "Slot map needs %u buffers for %llu bytes\n",
si->si_blocks, bytes);
si->si_bh = kzalloc(sizeof(struct buffer_head *) * si->si_blocks,
GFP_KERNEL);
if (!si->si_bh) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
for (i = 0; i < si->si_blocks; i++) {
status = ocfs2_extent_map_get_blocks(si->si_inode, i,
&blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;
}
mlog(0, "Reading slot map block %u at %llu\n", i,
(unsigned long long)blkno);
bh = NULL; /* Acquire a fresh bh */
status = ocfs2_read_block(osb, blkno, &bh, 0, si->si_inode);
if (status < 0) {
mlog_errno(status);
goto bail;
}
si->si_bh[i] = bh;
}
bail:
return status;
}
int ocfs2_init_slot_info(struct ocfs2_super *osb)
{
int status, i;
u64 blkno;
struct inode *inode = NULL;
struct buffer_head *bh = NULL;
struct ocfs2_slot_info *si;
si = kzalloc(sizeof(struct ocfs2_slot_info), GFP_KERNEL);
@ -254,20 +349,13 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
goto bail;
}
status = ocfs2_extent_map_get_blocks(inode, 0ULL, &blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = ocfs2_read_block(osb, blkno, &bh, 0, inode);
if (status < 0) {
mlog_errno(status);
goto bail;
}
si->si_inode = inode;
si->si_bh = bh;
status = ocfs2_map_slot_buffers(osb, si);
if (status < 0) {
mlog_errno(status);
goto bail;
}
osb->slot_info = (struct ocfs2_slot_info *)si;
bail:
if (status < 0 && si)