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dcache: d_obtain_alias callers don't all want DISCONNECTED

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There are a few d_obtain_alias callers that are using it to get the
root of a filesystem which may already have an alias somewhere else.

This is not the same as the filehandle-lookup case, and none of them
actually need DCACHE_DISCONNECTED set.

It isn't really a serious problem, but it would really be clearer if we
reserved DCACHE_DISCONNECTED for those cases where it's actually needed.

In the btrfs case this was causing a spurious printk from
nfsd/nfsfh.c:fh_verify when it found an unexpected DCACHE_DISCONNECTED
dentry.  Josef worked around this by unsetting DCACHE_DISCONNECTED
manually in 3a0dfa6a12 "Btrfs: unset DCACHE_DISCONNECTED when mounting
default subvol", and this replaces that workaround.

Cc: Josef Bacik <jbacik@fb.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
J. Bruce Fields
2014-02-14 17:35:37 -05:00
committed by Al Viro
parent da093a9b76
commit 1a0a397e41
6 changed files with 54 additions and 31 deletions
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9
fs/btrfs/super.c
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@@ -851,7 +851,6 @@ static struct dentry *get_default_root(struct super_block *sb,
struct btrfs_path *path;
struct btrfs_key location;
struct inode *inode;
struct dentry *dentry;
u64 dir_id;
int new = 0;
@@ -922,13 +921,7 @@ setup_root:
return dget(sb->s_root);
}
dentry = d_obtain_alias(inode);
if (!IS_ERR(dentry)) {
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_DISCONNECTED;
spin_unlock(&dentry->d_lock);
}
return dentry;
return d_obtain_root(inode);
}
static int btrfs_fill_super(struct super_block *sb,