summaryrefslogtreecommitdiff
path: root/fs/adfs/dir.c
diff options
context:
space:
mode:
authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-09 14:09:35 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-01-21 04:12:41 +0300
commit419a6e5e82ca0bdba0cc3624d969b65ae49d959b (patch)
tree2571e9fe0242dc1517f926097e52d17e67b280c6 /fs/adfs/dir.c
parenta317120bf7f8306b594ee650ee14f08a0e599602 (diff)
downloadlinux-419a6e5e82ca0bdba0cc3624d969b65ae49d959b.tar.xz
fs/adfs: dir: add generic directory reading
Both directory formats code the mechanics of fetching the directory buffers using their own implementations. Consolidate these into one implementation. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/adfs/dir.c')
-rw-r--r--fs/adfs/dir.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
index 3c303074aa5e..b8e2a909fa3f 100644
--- a/fs/adfs/dir.c
+++ b/fs/adfs/dir.c
@@ -78,6 +78,55 @@ void adfs_dir_relse(struct adfs_dir *dir)
dir->sb = NULL;
}
+int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr,
+ unsigned int size, struct adfs_dir *dir)
+{
+ struct buffer_head **bhs;
+ unsigned int i, num;
+ int block;
+
+ num = ALIGN(size, sb->s_blocksize) >> sb->s_blocksize_bits;
+ if (num > ARRAY_SIZE(dir->bh)) {
+ /* We only allow one extension */
+ if (dir->bhs != dir->bh)
+ return -EINVAL;
+
+ bhs = kcalloc(num, sizeof(*bhs), GFP_KERNEL);
+ if (!bhs)
+ return -ENOMEM;
+
+ if (dir->nr_buffers)
+ memcpy(bhs, dir->bhs, dir->nr_buffers * sizeof(*bhs));
+
+ dir->bhs = bhs;
+ }
+
+ for (i = dir->nr_buffers; i < num; i++) {
+ block = __adfs_block_map(sb, indaddr, i);
+ if (!block) {
+ adfs_error(sb, "dir %06x has a hole at offset %u",
+ indaddr, i);
+ goto error;
+ }
+
+ dir->bhs[i] = sb_bread(sb, block);
+ if (!dir->bhs[i]) {
+ adfs_error(sb,
+ "dir %06x failed read at offset %u, mapped block 0x%08x",
+ indaddr, i, block);
+ goto error;
+ }
+
+ dir->nr_buffers++;
+ }
+ return 0;
+
+error:
+ adfs_dir_relse(dir);
+
+ return -EIO;
+}
+
static int adfs_dir_read(struct super_block *sb, u32 indaddr,
unsigned int size, struct adfs_dir *dir)
{