4b7975e75d
Most notable fixes from a Proxmox VE perspective are: * "virtio-net: correctly copy vnet header when flushing TX" To prevent a stack overflow that could lead to leaking parts of the QEMU process's memory. * "hw/pflash: implement update buffer for block writes" To prevent an edge case for half-completed writes. This potentially affected EFI disks. * Fixes to i386 emulation and ARM emulation. No changes for patches were necessary (all are just automatic context changes). Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
135 lines
4.9 KiB
Diff
135 lines
4.9 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 | 59 ++++++++++++++++++++++++++++++--------------
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qapi/block-core.json | 3 ++-
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2 files changed, 42 insertions(+), 20 deletions(-)
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diff --git a/block/file-posix.c b/block/file-posix.c
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index ca551baa42..8b3b83e9d4 100644
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--- a/block/file-posix.c
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+++ b/block/file-posix.c
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@@ -2873,6 +2873,7 @@ 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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@@ -2913,19 +2914,22 @@ 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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@@ -2979,13 +2983,15 @@ 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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@@ -3009,6 +3015,7 @@ raw_co_create_opts(BlockDriver *drv, const char *filename,
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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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@@ -3031,6 +3038,18 @@ raw_co_create_opts(BlockDriver *drv, const char *filename,
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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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@@ -3042,6 +3061,8 @@ raw_co_create_opts(BlockDriver *drv, const char *filename,
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.nocow = nocow,
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.has_extent_size_hint = has_extent_size_hint,
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.extent_size_hint = extent_size_hint,
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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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diff --git a/qapi/block-core.json b/qapi/block-core.json
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index a5cea82139..bb471c078d 100644
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--- a/qapi/block-core.json
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+++ b/qapi/block-core.json
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@@ -4880,7 +4880,8 @@
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'size': 'size',
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'*preallocation': 'PreallocMode',
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'*nocow': 'bool',
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- '*extent-size-hint': 'size'} }
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+ '*extent-size-hint': 'size',
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+ '*locking': 'OnOffAuto' } }
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##
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# @BlockdevCreateOptionsGluster:
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