144 lines
5.2 KiB
Diff
144 lines
5.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Wolfgang Bumiller <w.bumiller@proxmox.com>
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Date: Mon, 6 Apr 2020 12:16:50 +0200
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Subject: [PATCH] PVE: [Up+Config] file-posix: make locking optiono on create
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Otherwise creating images on nfs/cifs can be problematic.
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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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block/file-posix.c | 61 +++++++++++++++++++++++++++++---------------
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qapi/block-core.json | 3 ++-
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2 files changed, 43 insertions(+), 21 deletions(-)
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diff --git a/block/file-posix.c b/block/file-posix.c
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index b527e82a82..36ebd0967e 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -2309,6 +2309,7 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
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int fd;
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uint64_t perm, shared;
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int result = 0;
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+ bool locked = false;
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/* Validate options and set default values */
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assert(options->driver == BLOCKDEV_DRIVER_FILE);
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@@ -2342,19 +2343,22 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
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perm = BLK_PERM_WRITE | BLK_PERM_RESIZE;
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shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE;
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- /* Step one: Take locks */
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- result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp);
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- if (result < 0) {
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- goto out_close;
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- }
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+ if (file_opts->locking != ON_OFF_AUTO_OFF) {
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+ /* Step one: Take locks */
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+ result = raw_apply_lock_bytes(NULL, fd, perm, ~shared, false, errp);
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+ if (result < 0) {
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+ goto out_close;
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+ }
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+ locked = true;
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- /* Step two: Check that nobody else has taken conflicting locks */
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- result = raw_check_lock_bytes(fd, perm, shared, errp);
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- if (result < 0) {
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- error_append_hint(errp,
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- "Is another process using the image [%s]?\n",
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- file_opts->filename);
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- goto out_unlock;
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+ /* Step two: Check that nobody else has taken conflicting locks */
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+ result = raw_check_lock_bytes(fd, perm, shared, errp);
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+ if (result < 0) {
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+ error_append_hint(errp,
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+ "Is another process using the image [%s]?\n",
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+ file_opts->filename);
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+ goto out_unlock;
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+ }
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}
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/* Clear the file by truncating it to 0 */
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@@ -2387,13 +2391,15 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
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}
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out_unlock:
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- raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err);
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- if (local_err) {
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- /* The above call should not fail, and if it does, that does
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- * not mean the whole creation operation has failed. So
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- * report it the user for their convenience, but do not report
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- * it to the caller. */
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- warn_report_err(local_err);
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+ if (locked) {
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+ raw_apply_lock_bytes(NULL, fd, 0, 0, true, &local_err);
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+ if (local_err) {
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+ /* The above call should not fail, and if it does, that does
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+ * not mean the whole creation operation has failed. So
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+ * report it the user for their convenience, but do not report
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+ * it to the caller. */
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+ warn_report_err(local_err);
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+ }
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}
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out_close:
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@@ -2416,6 +2422,7 @@ static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
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PreallocMode prealloc;
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char *buf = NULL;
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Error *local_err = NULL;
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+ OnOffAuto locking;
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/* Skip file: protocol prefix */
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strstart(filename, "file:", &filename);
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@@ -2433,6 +2440,18 @@ static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
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return -EINVAL;
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}
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+ locking = qapi_enum_parse(&OnOffAuto_lookup,
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+ qemu_opt_get(opts, "locking"),
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+ ON_OFF_AUTO_AUTO, &local_err);
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+ if (local_err) {
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+ error_propagate(errp, local_err);
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+ return -EINVAL;
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+ }
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+
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+ if (locking == ON_OFF_AUTO_AUTO) {
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+ locking = ON_OFF_AUTO_OFF;
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+ }
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+
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options = (BlockdevCreateOptions) {
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.driver = BLOCKDEV_DRIVER_FILE,
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.u.file = {
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@@ -2442,6 +2461,8 @@ static int coroutine_fn raw_co_create_opts(BlockDriver *drv,
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.preallocation = prealloc,
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.has_nocow = true,
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.nocow = nocow,
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+ .has_locking = true,
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+ .locking = locking,
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},
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};
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return raw_co_create(&options, errp);
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@@ -2983,7 +3004,7 @@ static int raw_check_perm(BlockDriverState *bs, uint64_t perm, uint64_t shared,
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}
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/* Copy locks to the new fd */
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- if (s->perm_change_fd) {
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+ if (s->use_lock && s->perm_change_fd) {
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ret = raw_apply_lock_bytes(NULL, s->perm_change_fd, perm, ~shared,
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false, errp);
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if (ret < 0) {
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diff --git a/qapi/block-core.json b/qapi/block-core.json
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index 943df1926a..4c55464f86 100644
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--- a/qapi/block-core.json
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+++ b/qapi/block-core.json
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@@ -4183,7 +4183,8 @@
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'data': { 'filename': 'str',
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'size': 'size',
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'*preallocation': 'PreallocMode',
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- '*nocow': 'bool' } }
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+ '*nocow': 'bool',
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+ '*locking': 'OnOffAuto' } }
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##
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# @BlockdevCreateOptionsGluster:
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