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-rw-r--r--libmount/src/tab_update.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/libmount/src/tab_update.c b/libmount/src/tab_update.c
index 13f6f6ebe..bbe0cb2d7 100644
--- a/libmount/src/tab_update.c
+++ b/libmount/src/tab_update.c
@@ -286,6 +286,7 @@ int mnt_update_force_rdonly(struct libmnt_update *upd, int rdonly)
return rc;
}
+
/*
* Allocates an utab entry (upd->fs) for mount/remount. This function should be
* called *before* mount(2) syscall. The @fs is used as a read-only template.
@@ -873,6 +874,67 @@ int mnt_update_table(struct libmnt_update *upd, struct libmnt_lock *lc)
return rc;
}
+int mnt_update_already_done(struct libmnt_update *upd, struct libmnt_lock *lc)
+{
+ struct libmnt_table *tb = NULL;
+ struct libmnt_lock *lc0 = lc;
+ int rc = 0;
+
+ if (!upd || !upd->filename || (!upd->fs && !upd->target))
+ return -EINVAL;
+
+ DBG(UPDATE, mnt_debug_h(upd, "%s: checking for previous update", upd->filename));
+
+ if (!lc) {
+ lc = mnt_new_lock(upd->filename, 0);
+ if (lc)
+ mnt_lock_block_signals(lc, TRUE);
+ }
+ if (lc && upd->userspace_only)
+ mnt_lock_use_simplelock(lc, TRUE); /* use flock */
+ if (lc)
+ rc = mnt_lock_file(lc);
+ if (rc)
+ goto done;
+
+ tb = __mnt_new_table_from_file(upd->filename,
+ upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB);
+ if (lc)
+ mnt_unlock_file(lc);
+ if (!tb)
+ goto done;
+
+ if (upd->fs) {
+ /* mount */
+ const char *tgt = mnt_fs_get_target(upd->fs);
+ const char *src = mnt_fs_get_bindsrc(upd->fs) ?
+ mnt_fs_get_bindsrc(upd->fs) :
+ mnt_fs_get_source(upd->fs);
+
+ if (mnt_table_find_pair(tb, src, tgt, MNT_ITER_BACKWARD)) {
+ DBG(UPDATE, mnt_debug_h(upd, "%s: found %s %s",
+ upd->filename, src, tgt));
+ rc = 1;
+ }
+ } else if (upd->target) {
+ /* umount */
+ if (!mnt_table_find_target(tb, upd->target, MNT_ITER_BACKWARD)) {
+ DBG(UPDATE, mnt_debug_h(upd, "%s: not-found (umounted) %s",
+ upd->filename, upd->target));
+ rc = 1;
+ }
+ }
+
+ mnt_unref_table(tb);
+done:
+ if (lc && lc != lc0)
+ mnt_free_lock(lc);
+ DBG(UPDATE, mnt_debug_h(upd, "%s: previous update check done [rc=%d]",
+ upd->filename, rc));
+ return rc;
+}
+
+
#ifdef TEST_PROGRAM
static int update(const char *target, struct libmnt_fs *fs, unsigned long mountflags)