diff options
| author | Karel Zak <kzak@redhat.com> | 2022-05-25 14:01:52 +0200 |
|---|---|---|
| committer | Karel Zak <kzak@redhat.com> | 2023-01-03 12:53:12 +0100 |
| commit | b0a165dc76c024614a930325877a25555d4ff819 (patch) | |
| tree | 3aeb54c393c16da209ee34f012e63ef6f45403d9 /libmount/src/hooks.c | |
| parent | 17de67aa1d7dee8cb8ea3040867a989af44a8243 (diff) | |
| download | util-linux-b0a165dc76c024614a930325877a25555d4ff819.tar.gz | |
libmount: reimplement X-mount.subdir= by hooks
* "prepare-target hook" checks for X-mount.subdir= and define pre-mount hook
* "mount-pre hook" unshares temporary directory, redirect the next
mount(2) to this temporary directory
* "mount-post hook" binds subdirectory to the final target, umounts
temporary directory
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'libmount/src/hooks.c')
| -rw-r--r-- | libmount/src/hooks.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/libmount/src/hooks.c b/libmount/src/hooks.c index 5e6327c6e5..13a3185993 100644 --- a/libmount/src/hooks.c +++ b/libmount/src/hooks.c @@ -8,12 +8,14 @@ * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. - */ - -/** - * SECTION: hookset - * @title: Mount context hooks - * @short_description: extensions to mount process + * + * + * The "hookset" is set of callbacks (hooks) that implement some functionality. + * It supports two kinds of data: + * + * - global data : accessible for all callbacks, independent on defined hooks + * + * - per-hook data : usually used by the callback function */ #include "mountP.h" @@ -23,6 +25,7 @@ static const struct libmnt_hookset *hooksets[] = { #ifdef __linux__ &hookset_mkdir, + &hookset_subdir, &hookset_mount_legacy #endif }; @@ -151,6 +154,7 @@ int mnt_context_set_hookset_data(struct libmnt_context *cxt, /* deallocate old data */ if (data == NULL) { if (hd) { + DBG(CXT, ul_debugobj(cxt, " free '%s' data", hs->name)); list_del(&hd->datas); free(hd); } @@ -163,7 +167,7 @@ int mnt_context_set_hookset_data(struct libmnt_context *cxt, if (!hd) return -ENOMEM; - DBG(CXT, ul_debugobj(cxt, "alloc '%s' data", hs->name)); + DBG(CXT, ul_debugobj(cxt, " alloc '%s' data", hs->name)); INIT_LIST_HEAD(&hd->datas); hd->hookset = hs; list_add_tail(&hd->datas, &cxt->hooksets_datas); |