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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-06-06 18:56:51 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-14 16:32:41 +0400
commitbc86256d2e80e6731a2055175d9a32cf96eb71f8 (patch)
tree0df8b5d31aa2ba7e8bbf83e1cdea8ca6a8c8f168 /fs/affs
parentfdb1335a82ef1ef9442ac9377796e4e7a69d1ae4 (diff)
downloadlinux-bc86256d2e80e6731a2055175d9a32cf96eb71f8.tar.gz
affs: stop setting bm_flags
AFFS stores values '1' and '2' in 'bm_flags', and I fail to see any logic when it prefers one or another. AFFS writes '1' only from '->put_super()', while '->sync_fs()' and '->write_super()' store value '2'. So on the first glance, it looks like we want to have '1' if we unmount. However, this does not really happen in these cases: 1. superblock is written via 'write_super()' then we unmount; 2. we re-mount R/O, then unmount. which are quite typical. I could not find good documentation describing this field, except of one random piece of documentation in the internet which says that -1 means that the root block is valid, which is not consistent with what we have in the Linux AFFS driver. Jan Kara commented on this: "I have some vague recollection that on Amiga boolean was usually encoded as: 0 == false, ~0 == -1 == true. But it has been ages..." Thus, my conclusion is that value of '1' is as good as value of '2' and we can just always use '2'. An Jan Kara suggested to go further: "generally bm_flags handling looks strange. If they are 0, we mount fs read only and thus cannot change them. If they are != 0, we write 2 there. So IMHO if you just removed bm_flags setting, nothing will really happen." So this patch removes the bm_flags setting completely. This makes the "clean" argument of the 'affs_commit_super()' function unneeded, so it is also removed. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/affs')
-rw-r--r--fs/affs/super.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 0782653a05a..1d42e468abd 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -25,13 +25,12 @@ static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int affs_remount (struct super_block *sb, int *flags, char *data);
static void
-affs_commit_super(struct super_block *sb, int wait, int clean)
+affs_commit_super(struct super_block *sb, int wait)
{
struct affs_sb_info *sbi = AFFS_SB(sb);
struct buffer_head *bh = sbi->s_root_bh;
struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
- tail->bm_flag = cpu_to_be32(clean);
secs_to_datestamp(get_seconds(), &tail->disk_change);
affs_fix_checksum(sb, bh);
mark_buffer_dirty(bh);
@@ -46,7 +45,7 @@ affs_put_super(struct super_block *sb)
pr_debug("AFFS: put_super()\n");
if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
- affs_commit_super(sb, 1, 1);
+ affs_commit_super(sb, 1);
kfree(sbi->s_prefix);
affs_free_bitmap(sb);
@@ -60,7 +59,7 @@ affs_write_super(struct super_block *sb)
{
lock_super(sb);
if (!(sb->s_flags & MS_RDONLY))
- affs_commit_super(sb, 1, 2);
+ affs_commit_super(sb, 1);
sb->s_dirt = 0;
unlock_super(sb);
@@ -71,7 +70,7 @@ static int
affs_sync_fs(struct super_block *sb, int wait)
{
lock_super(sb);
- affs_commit_super(sb, wait, 2);
+ affs_commit_super(sb, wait);
sb->s_dirt = 0;
unlock_super(sb);
return 0;