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authorMikulas Patocka <mikulas@twibright.com>2015-09-02 22:50:12 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-03 11:55:30 -0700
commita64eefaac1c5cc8dbc6995228fe08a61b8e1d26b (patch)
tree0945e739dbe805c12f5d24170ae8486f6df79a43 /fs/hpfs/map.c
parent64291f7db5bd8150a74ad2036f1037e6a0428df2 (diff)
hpfs: support hotfixes
When the OS/2 driver hits a disk write error, it writes the sector to another location and adds the sector mapping to the hotfix map. This patch makes the hpfs driver understand the hotfix map and remap accesses accoring to it. Signed-off-by: Mikulas Patocka <mikulas@twibright.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hpfs/map.c')
-rw-r--r--fs/hpfs/map.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/hpfs/map.c b/fs/hpfs/map.c
index 442770edcdc7..a69bbc1e87f8 100644
--- a/fs/hpfs/map.c
+++ b/fs/hpfs/map.c
@@ -130,6 +130,32 @@ __le32 *hpfs_load_bitmap_directory(struct super_block *s, secno bmp)
return b;
}
+void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock)
+{
+ struct quad_buffer_head qbh;
+ u32 *directory;
+ u32 n_hotfixes, n_used_hotfixes;
+ unsigned i;
+
+ n_hotfixes = le32_to_cpu(spareblock->n_spares);
+ n_used_hotfixes = le32_to_cpu(spareblock->n_spares_used);
+
+ if (n_hotfixes > 256 || n_used_hotfixes > n_hotfixes) {
+ hpfs_error(s, "invalid number of hotfixes: %u, used: %u", n_hotfixes, n_used_hotfixes);
+ return;
+ }
+ if (!(directory = hpfs_map_4sectors(s, le32_to_cpu(spareblock->hotfix_map), &qbh, 0))) {
+ hpfs_error(s, "can't load hotfix map");
+ return;
+ }
+ for (i = 0; i < n_used_hotfixes; i++) {
+ hpfs_sb(s)->hotfix_from[i] = le32_to_cpu(directory[i]);
+ hpfs_sb(s)->hotfix_to[i] = le32_to_cpu(directory[n_hotfixes + i]);
+ }
+ hpfs_sb(s)->n_hotfixes = n_used_hotfixes;
+ hpfs_brelse4(&qbh);
+}
+
/*
* Load fnode to memory
*/

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