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authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-09 14:11:13 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-01-21 04:12:42 +0300
commita464152f2e6dfd6d8be45c5e591cb8be20a97bdb (patch)
treee588af1ee453c1100335035c1566a82b459becde
parentd79288b4f61b40976182786ba2cb05ed5f2b6945 (diff)
downloadlinux-a464152f2e6dfd6d8be45c5e591cb8be20a97bdb.tar.xz
fs/adfs: bigdir: implement directory update support
Implement big directory entry update support in the same way that we do for new directories. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/adfs/dir_fplus.c54
1 files changed, 53 insertions, 1 deletions
diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
index 4ab8987962f0..48ea299b6ece 100644
--- a/fs/adfs/dir_fplus.c
+++ b/fs/adfs/dir_fplus.c
@@ -120,7 +120,7 @@ static int adfs_fplus_read(struct super_block *sb, u32 indaddr,
}
dirsize = le32_to_cpu(h->bigdirsize);
- if (dirsize != size) {
+ if (size && dirsize != size) {
adfs_msg(sb, KERN_WARNING,
"dir %06x header size %X does not match directory size %X",
indaddr, dirsize, size);
@@ -226,9 +226,61 @@ static int adfs_fplus_iterate(struct adfs_dir *dir, struct dir_context *ctx)
return 0;
}
+static int adfs_fplus_update(struct adfs_dir *dir, struct object_info *obj)
+{
+ struct adfs_bigdirheader *h = dir->bighead;
+ struct adfs_bigdirentry bde;
+ int offset, end, ret;
+
+ offset = adfs_fplus_offset(h, 0) - sizeof(bde);
+ end = adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries));
+
+ do {
+ offset += sizeof(bde);
+ if (offset >= end) {
+ adfs_error(dir->sb, "unable to locate entry to update");
+ return -ENOENT;
+ }
+ ret = adfs_dir_copyfrom(&bde, dir, offset, sizeof(bde));
+ if (ret) {
+ adfs_error(dir->sb, "error reading directory entry");
+ return -ENOENT;
+ }
+ } while (le32_to_cpu(bde.bigdirindaddr) != obj->indaddr);
+
+ bde.bigdirload = cpu_to_le32(obj->loadaddr);
+ bde.bigdirexec = cpu_to_le32(obj->execaddr);
+ bde.bigdirlen = cpu_to_le32(obj->size);
+ bde.bigdirindaddr = cpu_to_le32(obj->indaddr);
+ bde.bigdirattr = cpu_to_le32(obj->attr);
+
+ return adfs_dir_copyto(dir, offset, &bde, sizeof(bde));
+}
+
+static int adfs_fplus_commit(struct adfs_dir *dir)
+{
+ int ret;
+
+ /* Increment directory sequence number */
+ dir->bighead->startmasseq += 1;
+ dir->bigtail->bigdirendmasseq += 1;
+
+ /* Update directory check byte */
+ dir->bigtail->bigdircheckbyte = adfs_fplus_checkbyte(dir);
+
+ /* Make sure the directory still validates correctly */
+ ret = adfs_fplus_validate_header(dir->bighead);
+ if (ret == 0)
+ ret = adfs_fplus_validate_tail(dir->bighead, dir->bigtail);
+
+ return ret;
+}
+
const struct adfs_dir_ops adfs_fplus_dir_ops = {
.read = adfs_fplus_read,
.iterate = adfs_fplus_iterate,
.setpos = adfs_fplus_setpos,
.getnext = adfs_fplus_getnext,
+ .update = adfs_fplus_update,
+ .commit = adfs_fplus_commit,
};