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vfs_fileid: add "fsname_norootdir_ext" option

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This can be used to deliberately break lock coherency between all smbd processes
in the whole cluster for the root directory of a share.

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>

Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Sep 25 00:48:45 UTC 2019 on sn-devel-184
This commit is contained in:
Ralph Boehme 2019-09-03 15:33:42 +02:00
parent 929555b7c8
commit 517ec63004
2 changed files with 25 additions and 0 deletions
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8
docs-xml/manpages/vfs_fileid.8.xml
View File

@ -87,6 +87,14 @@
algorithm. This can be used to deliberately break lock coherency
in a cluster for the root directory of a share.
</para>
<para>The <command>fsname_norootdir_ext</command> algorithm
generates device ids by hashing the kernel device name, except
for the root directory of shares where it will use the hostname
algorithm. Additionally it generates an extid based on the
process pid. This can be used to deliberately break lock
coherency between all smbd processes in the whole cluster for
the root directory of a share.
</para>
</listitem>
</varlistentry>

17
source3/modules/vfs_fileid.c
View File

@ -288,6 +288,12 @@ static uint64_t fileid_extid_mapping_zero(struct fileid_handle_data *data,
return 0;
}
static uint64_t fileid_extid_mapping_pid(struct fileid_handle_data *data,
const SMB_STRUCT_STAT *sbuf)
{
return getpid();
}
static int get_connectpath_ino(struct vfs_handle_struct *handle,
ino_t *ino)
{
@ -370,6 +376,17 @@ static int fileid_connect(struct vfs_handle_struct *handle,
data->device_mapping_fn = fileid_device_mapping_fsname;
data->extid_mapping_fn = fileid_extid_mapping_zero;
ret = get_connectpath_ino(handle, &data->nolockinode);
if (ret != 0) {
saved_errno = errno;
SMB_VFS_NEXT_DISCONNECT(handle);
errno = saved_errno;
return -1;
}
} else if (strcmp("fsname_norootdir_ext", algorithm) == 0) {
data->device_mapping_fn = fileid_device_mapping_fsname;
data->extid_mapping_fn = fileid_extid_mapping_pid;
ret = get_connectpath_ino(handle, &data->nolockinode);
if (ret != 0) {
saved_errno = errno;