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SubjectRe: - r-o-bind-mount-clean-up-ocfs2-nlink-handling.patch removed from -mm tree
On Tue, Sep 12, 2006 at 10:06:30PM -0700, akpm@osdl.org wrote:
> The patch titled
>
> r/o bind mounts: clean up OCFS2 nlink handling
>
> has been removed from the -mm tree. Its filename is
>
> r-o-bind-mount-clean-up-ocfs2-nlink-handling.patch
>
> This patch was dropped because git-ocfs2 changes broke it. New patch, please.
Yep, that was very likely due to my dentry vote removal changes.

Dave, how's this one look? I guess I'll leave the same description message
below...


Subject: r/o bind mounts: clean up OCFS2 nlink handling
From: Dave Hansen <haveblue@us.ibm.com>

OCFS2 does some operations on i_nlink, then reverts them if some of its
operations fail to complete. This does not fit in well with the drop_nlink()
logic where we expect i_nlink to stay at zero once it gets there.

So, delay all of the nlink operations until we're sure that the operations
have completed. Also, introduce a small helper to check whether an inode has
proper "unlinkable" i_nlink counts no matter whether it is a directory or
regular inode.

This patch is broken out from the others because it does contain some logical
changes.

Cleanups to apply against current git-ocfs2 changes by Mark Fasheh.

Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@osdl.org>

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 4cfc061..4f74cd9 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -797,11 +797,23 @@ static int ocfs2_remote_dentry_delete(st
return ret;
}

+static inline int inode_is_unlinkable(struct inode *inode)
+{
+ if (S_ISDIR(inode->i_mode)) {
+ if (inode->i_nlink == 2)
+ return 1;
+ return 0;
+ }
+
+ if (inode->i_nlink == 1)
+ return 1;
+ return 0;
+}
+
static int ocfs2_unlink(struct inode *dir,
struct dentry *dentry)
{
int status;
- unsigned int saved_nlink = 0;
struct inode *inode = dentry->d_inode;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
u64 blkno;
@@ -813,6 +825,7 @@ static int ocfs2_unlink(struct inode *di
struct buffer_head *dirent_bh = NULL;
char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
struct buffer_head *orphan_entry_bh = NULL;
+ unsigned int future_nlink;

mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
dentry->d_name.len, dentry->d_name.name);
@@ -876,15 +889,10 @@ static int ocfs2_unlink(struct inode *di
}
}

- /* There are still a few steps left until we can consider the
- * unlink to have succeeded. Save off nlink here before
- * modification so we can set it back in case we hit an issue
- * before commit. */
- saved_nlink = inode->i_nlink;
- if (S_ISDIR(inode->i_mode))
- inode->i_nlink = 0;
+ if (S_ISDIR(inode->i_mode) && (inode->i_nlink == 2))
+ future_nlink = 0;
else
- inode->i_nlink--;
+ future_nlink = inode->i_nlink - 1;

status = ocfs2_remote_dentry_delete(dentry);
if (status < 0) {
@@ -894,7 +902,7 @@ static int ocfs2_unlink(struct inode *di
goto leave;
}

- if (!inode->i_nlink) {
+ if (inode_is_unlinkable(inode)) {
status = ocfs2_prepare_orphan_dir(osb, handle, inode,
orphan_name,
&orphan_entry_bh);
@@ -921,7 +929,7 @@ static int ocfs2_unlink(struct inode *di

fe = (struct ocfs2_dinode *) fe_bh->b_data;

- if (!inode->i_nlink) {
+ if (inode_is_unlinkable(inode)) {
status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
orphan_entry_bh);
if (status < 0) {
@@ -937,10 +945,10 @@ static int ocfs2_unlink(struct inode *di
goto leave;
}

- /* We can set nlink on the dinode now. clear the saved version
- * so that it doesn't get set later. */
+ if (S_ISDIR(inode->i_mode))
+ drop_nlink(inode);
+ drop_nlink(inode);
fe->i_links_count = cpu_to_le16(inode->i_nlink);
- saved_nlink = 0;

status = ocfs2_journal_dirty(handle, fe_bh);
if (status < 0) {
@@ -949,7 +957,7 @@ static int ocfs2_unlink(struct inode *di
}

if (S_ISDIR(inode->i_mode)) {
- dir->i_nlink--;
+ drop_nlink(dir);
status = ocfs2_mark_inode_dirty(handle, dir,
parent_node_bh);
if (status < 0) {
@@ -959,9 +967,6 @@ static int ocfs2_unlink(struct inode *di
}

leave:
- if (status < 0 && saved_nlink)
- inode->i_nlink = saved_nlink;
-
if (handle)
ocfs2_commit_trans(handle);

-
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