1 files changed, 33 insertions, 6 deletions

diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c
index 8057fe4e6574..f626114449e4 100644
--- a/fs/hpfs/buffer.c
+++ b/fs/hpfs/buffer.c
@@ -10,6 +10,30 @@
 #include <linux/blkdev.h>
 #include "hpfs_fn.h"
 
+secno hpfs_search_hotfix_map(struct super_block *s, secno sec)
+{
+        unsigned i;
+        struct hpfs_sb_info *sbi = hpfs_sb(s);
+        for (i = 0; unlikely(i < sbi->n_hotfixes); i++) {
+                if (sbi->hotfix_from[i] == sec) {
+                        return sbi->hotfix_to[i];
+                }
+        }
+        return sec;
+}
+
+unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n)
+{
+        unsigned i;
+        struct hpfs_sb_info *sbi = hpfs_sb(s);
+        for (i = 0; unlikely(i < sbi->n_hotfixes); i++) {
+                if (sbi->hotfix_from[i] >= sec && sbi->hotfix_from[i] < sec + n) {
+                        n = sbi->hotfix_from[i] - sec;
+                }
+        }
+        return n;
+}
+
 void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n)
 {
         struct buffer_head *bh;
@@ -18,6 +42,9 @@ void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n)
         if (n <= 0 || unlikely(secno >= hpfs_sb(s)->sb_fs_size))
                 return;
 
+        if (unlikely(hpfs_search_hotfix_map_for_range(s, secno, n) != n))
+                return;
+
         bh = sb_find_get_block(s, secno);
         if (bh) {
                 if (buffer_uptodate(bh)) {
@@ -51,7 +78,7 @@ void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head
 
         cond_resched();
 
-        *bhp = bh = sb_bread(s, secno);
+        *bhp = bh = sb_bread(s, hpfs_search_hotfix_map(s, secno));
         if (bh != NULL)
                 return bh->b_data;
         else {
@@ -71,7 +98,7 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head
 
         cond_resched();
 
-        if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
+        if ((*bhp = bh = sb_getblk(s, hpfs_search_hotfix_map(s, secno))) != NULL) {
                 if (!buffer_uptodate(bh)) wait_on_buffer(bh);
                 set_buffer_uptodate(bh);
                 return bh->b_data;
@@ -99,10 +126,10 @@ void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffe
 
         hpfs_prefetch_sectors(s, secno, 4 + ahead);
 
-        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;
+        if (!hpfs_map_sector(s, secno + 0, &qbh->bh[0], 0)) goto bail0;
+        if (!hpfs_map_sector(s, secno + 1, &qbh->bh[1], 0)) goto bail1;
+        if (!hpfs_map_sector(s, secno + 2, &qbh->bh[2], 0)) goto bail2;
+        if (!hpfs_map_sector(s, secno + 3, &qbh->bh[3], 0)) 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) &&