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ceph: simplify+fix atomic_open

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The initial ->atomic_open op was carried over from the old intent code,
which was incomplete and didn't really work.  Replace it with a fresh
method.  In particular:

 * always attempt to do an atomic open+lookup, both for the create case
   and for lookups of existing files.
 * fix symlink handling by returning 1 to the VFS so that we can follow
   the link to its destination. This fixes a longstanding ceph bug (#2392).

Signed-off-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Sage Weil
2012-07-31 11:27:36 -07:00
parent 1a9b4993b7
commit 5ef50c3bec
3 changed files with 40 additions and 66 deletions
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38
fs/ceph/dir.c
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@@ -633,44 +633,6 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
return dentry;
}
int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags, umode_t mode,
int *opened)
{
int err;
struct dentry *res = NULL;
if (!(flags & O_CREAT)) {
if (dentry->d_name.len > NAME_MAX)
return -ENAMETOOLONG;
err = ceph_init_dentry(dentry);
if (err < 0)
return err;
return ceph_lookup_open(dir, dentry, file, flags, mode, opened);
}
if (d_unhashed(dentry)) {
res = ceph_lookup(dir, dentry, 0);
if (IS_ERR(res))
return PTR_ERR(res);
if (res)
dentry = res;
}
/* We don't deal with positive dentries here */
if (dentry->d_inode)
return finish_no_open(file, res);
*opened |= FILE_CREATED;
err = ceph_lookup_open(dir, dentry, file, flags, mode, opened);
dput(res);
return err;
}
/*
* If we do a create but get no trace back from the MDS, follow up with
* a lookup (the VFS expects us to link up the provided dentry).