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| author | Joel Becker <joel.becker@oracle.com> | 2008-11-25 19:00:15 -0800 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2009-01-05 08:40:27 -0800 |
| commit | 2b656c1d6fc5ba7791a360766780a212faed5705 (patch) | |
| tree | ea1ec010e7c3af013f3fe2cbbbed180ad20b73b8 /fs/ocfs2 | |
| parent | 15d609293d1954465a4788b9b182214323c6a2a1 (diff) | |
| download | linux-2b656c1d6fc5ba7791a360766780a212faed5705.tar.bz2 | |
ocfs2: Explain t_is_new in ocfs2_cp_xattr_cluster().
I was unsure of the JOURNAL_ACCESS parameters in
ocfs2_cp_xattr_cluster(). They're based on the function argument
't_is_new', but I couldn't quite figure out how t_is_new mapped to
allocation. ocfs2_cp_xattr_cluster() actually overwrites the target,
regardless of t_is_new.
Well, I just figured it out. So I'm adding a big fat comment for those
who come after me. ocfs2_divide_xattr_cluster() has the same behavior.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | fs/ocfs2/xattr.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index 4dba34758827..5efcf4e85d7c 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -3747,6 +3747,11 @@ static int ocfs2_divide_xattr_bucket(struct inode *inode, goto out; } + /* + * Hey, if we're overwriting t_bucket, what difference does + * ACCESS_CREATE vs ACCESS_WRITE make? See the comment in the + * same part of ocfs2_cp_xattr_bucket(). + */ ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket, new_bucket_head ? OCFS2_JOURNAL_ACCESS_CREATE : @@ -3918,6 +3923,18 @@ static int ocfs2_cp_xattr_bucket(struct inode *inode, if (ret) goto out; + /* + * Hey, if we're overwriting t_bucket, what difference does + * ACCESS_CREATE vs ACCESS_WRITE make? Well, if we allocated a new + * cluster to fill, we came here from ocfs2_cp_xattr_cluster(), and + * it is really new - ACCESS_CREATE is required. But we also + * might have moved data out of t_bucket before extending back + * into it. ocfs2_add_new_xattr_bucket() can do this - its call + * to ocfs2_add_new_xattr_cluster() may have created a new extent + * and copied out the end of the old extent. Then it re-extends + * the old extent back to create space for new xattrs. That's + * how we get here, and the bucket isn't really new. + */ ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket, t_is_new ? OCFS2_JOURNAL_ACCESS_CREATE : |