From: David Howells dhowells@redhat.com
commit b98f0ec91c42d87a70da42726b852ac8d78a3257 upstream.
The afs_deliver_fs_rename() and yfs_deliver_fs_rename() functions both only decode the second file status returned unless the parent directories are different - unfortunately, this means that the xdr pointer isn't advanced and the volsync record will be read incorrectly in such an instance.
Fix this by always decoding the second status into the second status/callback block which wasn't being used if the dirs were the same.
The afs_update_dentry_version() calls that update the directory data version numbers on the dentries can then unconditionally use the second status record as this will always reflect the state of the destination dir (the two records will be identical if the destination dir is the same as the source dir)
Fixes: 260a980317da ("[AFS]: Add "directory write" support.") Fixes: 30062bd13e36 ("afs: Implement YFS support in the fs client") Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/afs/dir.c | 13 +++---------- fs/afs/fsclient.c | 12 ++++++------ fs/afs/yfsclient.c | 8 +++----- 3 files changed, 12 insertions(+), 21 deletions(-)
--- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -1892,7 +1892,6 @@ static int afs_rename(struct inode *old_ if (afs_begin_vnode_operation(&fc, orig_dvnode, key, true)) { afs_dataversion_t orig_data_version; afs_dataversion_t new_data_version; - struct afs_status_cb *new_scb = &scb[1];
orig_data_version = orig_dvnode->status.data_version + 1;
@@ -1904,7 +1903,6 @@ static int afs_rename(struct inode *old_ new_data_version = new_dvnode->status.data_version + 1; } else { new_data_version = orig_data_version; - new_scb = &scb[0]; }
while (afs_select_fileserver(&fc)) { @@ -1912,7 +1910,7 @@ static int afs_rename(struct inode *old_ fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode); afs_fs_rename(&fc, old_dentry->d_name.name, new_dvnode, new_dentry->d_name.name, - &scb[0], new_scb); + &scb[0], &scb[1]); }
afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break, @@ -1957,13 +1955,8 @@ static int afs_rename(struct inode *old_ * Note that if we ever implement RENAME_EXCHANGE, we'll have * to update both dentries with opposing dir versions. */ - if (new_dvnode != orig_dvnode) { - afs_update_dentry_version(&fc, old_dentry, &scb[1]); - afs_update_dentry_version(&fc, new_dentry, &scb[1]); - } else { - afs_update_dentry_version(&fc, old_dentry, &scb[0]); - afs_update_dentry_version(&fc, new_dentry, &scb[0]); - } + afs_update_dentry_version(&fc, old_dentry, &scb[1]); + afs_update_dentry_version(&fc, new_dentry, &scb[1]); d_move(old_dentry, new_dentry); goto error_tmp; } --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -988,16 +988,16 @@ static int afs_deliver_fs_rename(struct if (ret < 0) return ret;
- /* unmarshall the reply once we've received all of it */ + /* If the two dirs are the same, we have two copies of the same status + * report, so we just decode it twice. + */ bp = call->buffer; ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_dir_scb); if (ret < 0) return ret; - if (call->out_dir_scb != call->out_scb) { - ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb); - if (ret < 0) - return ret; - } + ret = xdr_decode_AFSFetchStatus(&bp, call, call->out_scb); + if (ret < 0) + return ret; xdr_decode_AFSVolSync(&bp, call->out_volsync);
_leave(" = 0 [done]"); --- a/fs/afs/yfsclient.c +++ b/fs/afs/yfsclient.c @@ -1158,11 +1158,9 @@ static int yfs_deliver_fs_rename(struct ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_dir_scb); if (ret < 0) return ret; - if (call->out_dir_scb != call->out_scb) { - ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb); - if (ret < 0) - return ret; - } + ret = xdr_decode_YFSFetchStatus(&bp, call, call->out_scb); + if (ret < 0) + return ret;
xdr_decode_YFSVolSync(&bp, call->out_volsync); _leave(" = 0 [done]");