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Diffstat (limited to 'fs/hpfs/buffer.c')
-rw-r--r--fs/hpfs/buffer.c160
1 files changed, 94 insertions, 66 deletions
diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c
index 793cb9d943d..8057fe4e657 100644
--- a/fs/hpfs/buffer.c
+++ b/fs/hpfs/buffer.c
@@ -7,22 +7,35 @@
*/
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/blkdev.h>
#include "hpfs_fn.h"
-void hpfs_lock_creation(struct super_block *s)
+void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n)
{
-#ifdef DEBUG_LOCKS
- printk("lock creation\n");
-#endif
- mutex_lock(&hpfs_sb(s)->hpfs_creation_de);
-}
-
-void hpfs_unlock_creation(struct super_block *s)
-{
-#ifdef DEBUG_LOCKS
- printk("unlock creation\n");
-#endif
- mutex_unlock(&hpfs_sb(s)->hpfs_creation_de);
+ struct buffer_head *bh;
+ struct blk_plug plug;
+
+ if (n <= 0 || unlikely(secno >= hpfs_sb(s)->sb_fs_size))
+ return;
+
+ bh = sb_find_get_block(s, secno);
+ if (bh) {
+ if (buffer_uptodate(bh)) {
+ brelse(bh);
+ return;
+ }
+ brelse(bh);
+ };
+
+ blk_start_plug(&plug);
+ while (n > 0) {
+ if (unlikely(secno >= hpfs_sb(s)->sb_fs_size))
+ break;
+ sb_breadahead(s, secno);
+ secno++;
+ n--;
+ }
+ blk_finish_plug(&plug);
}
/* Map a sector into a buffer and return pointers to it and to the buffer. */
@@ -32,13 +45,17 @@ void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head
{
struct buffer_head *bh;
+ hpfs_lock_assert(s);
+
+ hpfs_prefetch_sectors(s, secno, ahead);
+
cond_resched();
*bhp = bh = sb_bread(s, secno);
if (bh != NULL)
return bh->b_data;
else {
- printk("HPFS: hpfs_map_sector: read error\n");
+ pr_err("%s(): read error\n", __func__);
return NULL;
}
}
@@ -50,6 +67,8 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head
struct buffer_head *bh;
/*return hpfs_map_sector(s, secno, bhp, 0);*/
+ hpfs_lock_assert(s);
+
cond_resched();
if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
@@ -57,7 +76,7 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head
set_buffer_uptodate(bh);
return bh->b_data;
} else {
- printk("HPFS: hpfs_get_sector: getblk failed\n");
+ pr_err("%s(): getblk failed\n", __func__);
return NULL;
}
}
@@ -67,44 +86,45 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head
void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffer_head *qbh,
int ahead)
{
- struct buffer_head *bh;
char *data;
+ hpfs_lock_assert(s);
+
cond_resched();
if (secno & 3) {
- printk("HPFS: hpfs_map_4sectors: unaligned read\n");
+ pr_err("%s(): unaligned read\n", __func__);
return NULL;
}
- qbh->data = data = kmalloc(2048, GFP_NOFS);
- if (!data) {
- printk("HPFS: hpfs_map_4sectors: out of memory\n");
- goto bail;
- }
+ hpfs_prefetch_sectors(s, secno, 4 + ahead);
- qbh->bh[0] = bh = sb_bread(s, secno);
- if (!bh)
- goto bail0;
- memcpy(data, bh->b_data, 512);
+ if (!(qbh->bh[0] = sb_bread(s, secno + 0))) goto bail0;
+ if (!(qbh->bh[1] = sb_bread(s, secno + 1))) goto bail1;
+ if (!(qbh->bh[2] = sb_bread(s, secno + 2))) goto bail2;
+ if (!(qbh->bh[3] = sb_bread(s, secno + 3))) goto bail3;
- qbh->bh[1] = bh = sb_bread(s, secno + 1);
- if (!bh)
- goto bail1;
- memcpy(data + 512, bh->b_data, 512);
+ if (likely(qbh->bh[1]->b_data == qbh->bh[0]->b_data + 1 * 512) &&
+ likely(qbh->bh[2]->b_data == qbh->bh[0]->b_data + 2 * 512) &&
+ likely(qbh->bh[3]->b_data == qbh->bh[0]->b_data + 3 * 512)) {
+ return qbh->data = qbh->bh[0]->b_data;
+ }
- qbh->bh[2] = bh = sb_bread(s, secno + 2);
- if (!bh)
- goto bail2;
- memcpy(data + 2 * 512, bh->b_data, 512);
+ qbh->data = data = kmalloc(2048, GFP_NOFS);
+ if (!data) {
+ pr_err("%s(): out of memory\n", __func__);
+ goto bail4;
+ }
- qbh->bh[3] = bh = sb_bread(s, secno + 3);
- if (!bh)
- goto bail3;
- memcpy(data + 3 * 512, bh->b_data, 512);
+ memcpy(data + 0 * 512, qbh->bh[0]->b_data, 512);
+ memcpy(data + 1 * 512, qbh->bh[1]->b_data, 512);
+ memcpy(data + 2 * 512, qbh->bh[2]->b_data, 512);
+ memcpy(data + 3 * 512, qbh->bh[3]->b_data, 512);
return data;
+ bail4:
+ brelse(qbh->bh[3]);
bail3:
brelse(qbh->bh[2]);
bail2:
@@ -112,9 +132,6 @@ void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffe
bail1:
brelse(qbh->bh[0]);
bail0:
- kfree(data);
- printk("HPFS: hpfs_map_4sectors: read error\n");
- bail:
return NULL;
}
@@ -125,50 +142,61 @@ void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
{
cond_resched();
+ hpfs_lock_assert(s);
+
if (secno & 3) {
- printk("HPFS: hpfs_get_4sectors: unaligned read\n");
+ pr_err("%s(): unaligned read\n", __func__);
return NULL;
}
- /*return hpfs_map_4sectors(s, secno, qbh, 0);*/
+ if (!hpfs_get_sector(s, secno + 0, &qbh->bh[0])) goto bail0;
+ if (!hpfs_get_sector(s, secno + 1, &qbh->bh[1])) goto bail1;
+ if (!hpfs_get_sector(s, secno + 2, &qbh->bh[2])) goto bail2;
+ if (!hpfs_get_sector(s, secno + 3, &qbh->bh[3])) goto bail3;
+
+ if (likely(qbh->bh[1]->b_data == qbh->bh[0]->b_data + 1 * 512) &&
+ likely(qbh->bh[2]->b_data == qbh->bh[0]->b_data + 2 * 512) &&
+ likely(qbh->bh[3]->b_data == qbh->bh[0]->b_data + 3 * 512)) {
+ return qbh->data = qbh->bh[0]->b_data;
+ }
+
if (!(qbh->data = kmalloc(2048, GFP_NOFS))) {
- printk("HPFS: hpfs_get_4sectors: out of memory\n");
- return NULL;
+ pr_err("%s(): out of memory\n", __func__);
+ goto bail4;
}
- if (!(hpfs_get_sector(s, secno, &qbh->bh[0]))) goto bail0;
- if (!(hpfs_get_sector(s, secno + 1, &qbh->bh[1]))) goto bail1;
- if (!(hpfs_get_sector(s, secno + 2, &qbh->bh[2]))) goto bail2;
- if (!(hpfs_get_sector(s, secno + 3, &qbh->bh[3]))) goto bail3;
- memcpy(qbh->data, qbh->bh[0]->b_data, 512);
- memcpy(qbh->data + 512, qbh->bh[1]->b_data, 512);
- memcpy(qbh->data + 2*512, qbh->bh[2]->b_data, 512);
- memcpy(qbh->data + 3*512, qbh->bh[3]->b_data, 512);
return qbh->data;
- bail3: brelse(qbh->bh[2]);
- bail2: brelse(qbh->bh[1]);
- bail1: brelse(qbh->bh[0]);
- bail0:
+bail4:
+ brelse(qbh->bh[3]);
+bail3:
+ brelse(qbh->bh[2]);
+bail2:
+ brelse(qbh->bh[1]);
+bail1:
+ brelse(qbh->bh[0]);
+bail0:
return NULL;
}
void hpfs_brelse4(struct quad_buffer_head *qbh)
{
- brelse(qbh->bh[3]);
- brelse(qbh->bh[2]);
- brelse(qbh->bh[1]);
+ if (unlikely(qbh->data != qbh->bh[0]->b_data))
+ kfree(qbh->data);
brelse(qbh->bh[0]);
- kfree(qbh->data);
+ brelse(qbh->bh[1]);
+ brelse(qbh->bh[2]);
+ brelse(qbh->bh[3]);
}
void hpfs_mark_4buffers_dirty(struct quad_buffer_head *qbh)
{
- PRINTK(("hpfs_mark_4buffers_dirty\n"));
- memcpy(qbh->bh[0]->b_data, qbh->data, 512);
- memcpy(qbh->bh[1]->b_data, qbh->data + 512, 512);
- memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
- memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
+ if (unlikely(qbh->data != qbh->bh[0]->b_data)) {
+ memcpy(qbh->bh[0]->b_data, qbh->data + 0 * 512, 512);
+ memcpy(qbh->bh[1]->b_data, qbh->data + 1 * 512, 512);
+ memcpy(qbh->bh[2]->b_data, qbh->data + 2 * 512, 512);
+ memcpy(qbh->bh[3]->b_data, qbh->data + 3 * 512, 512);
+ }
mark_buffer_dirty(qbh->bh[0]);
mark_buffer_dirty(qbh->bh[1]);
mark_buffer_dirty(qbh->bh[2]);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-05 00:11:18 +0000