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authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-09 14:10:27 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-01-21 04:12:41 +0300
commitffc8df347e4934c8bad776f7bdacb4842620b0c7 (patch)
tree4fab33896fb83b3297a13f6d7d75e1ad2f8d7b00 /fs/adfs
parent016936b32131d0b33328d8c109f83fabb56618a3 (diff)
downloadlinux-ffc8df347e4934c8bad776f7bdacb4842620b0c7.tar.xz
fs/adfs: newdir: factor out directory format validation
We have two locations where we validate the new directory format, so factor this out to a helper. 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')
-rw-r--r--fs/adfs/dir_f.c48
1 files changed, 20 insertions, 28 deletions
diff --git a/fs/adfs/dir_f.c b/fs/adfs/dir_f.c
index 7e56fcc21303..196706d581bf 100644
--- a/fs/adfs/dir_f.c
+++ b/fs/adfs/dir_f.c
@@ -121,6 +121,21 @@ adfs_dir_checkbyte(const struct adfs_dir *dir)
return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
}
+static int adfs_f_validate(struct adfs_dir *dir)
+{
+ struct adfs_dirheader *head = dir->dirhead;
+ struct adfs_newdirtail *tail = dir->newtail;
+
+ if (head->startmasseq != tail->endmasseq ||
+ (memcmp(&head->startname, "Nick", 4) &&
+ memcmp(&head->startname, "Hugo", 4)) ||
+ memcmp(&head->startname, &tail->endname, 4) ||
+ adfs_dir_checkbyte(dir) != tail->dircheckbyte)
+ return -EIO;
+
+ return 0;
+}
+
/* Read and check that a directory is valid */
static int adfs_dir_read(struct super_block *sb, u32 indaddr,
unsigned int size, struct adfs_dir *dir)
@@ -142,15 +157,7 @@ static int adfs_dir_read(struct super_block *sb, u32 indaddr,
dir->dirhead = bufoff(dir->bh, 0);
dir->newtail = bufoff(dir->bh, 2007);
- if (dir->dirhead->startmasseq != dir->newtail->endmasseq ||
- memcmp(&dir->dirhead->startname, &dir->newtail->endname, 4))
- goto bad_dir;
-
- if (memcmp(&dir->dirhead->startname, "Nick", 4) &&
- memcmp(&dir->dirhead->startname, "Hugo", 4))
- goto bad_dir;
-
- if (adfs_dir_checkbyte(dir) != dir->newtail->dircheckbyte)
+ if (adfs_f_validate(dir))
goto bad_dir;
return 0;
@@ -327,7 +334,7 @@ adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
ret = adfs_dir_find_entry(dir, obj->indaddr);
if (ret < 0) {
adfs_error(dir->sb, "unable to locate entry to update");
- goto out;
+ return ret;
}
__adfs_dir_put(dir, ret, obj);
@@ -344,26 +351,11 @@ adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
*/
dir->newtail->dircheckbyte = ret;
-#if 1
- if (dir->dirhead->startmasseq != dir->newtail->endmasseq ||
- memcmp(&dir->dirhead->startname, &dir->newtail->endname, 4))
- goto bad_dir;
-
- if (memcmp(&dir->dirhead->startname, "Nick", 4) &&
- memcmp(&dir->dirhead->startname, "Hugo", 4))
- goto bad_dir;
+ ret = adfs_f_validate(dir);
+ if (ret)
+ adfs_error(dir->sb, "whoops! I broke a directory!");
- if (adfs_dir_checkbyte(dir) != dir->newtail->dircheckbyte)
- goto bad_dir;
-#endif
- ret = 0;
-out:
return ret;
-#if 1
-bad_dir:
- adfs_error(dir->sb, "whoops! I broke a directory!");
- return -EIO;
-#endif
}
const struct adfs_dir_ops adfs_f_dir_ops = {