qcow2: add option to clean unused cache entries after some time

[qemu.git] / block / nfs.c

diff --git a/block/nfs.c b/block/nfs.c
index 8439e0d38964a8e522f09e0e9cbadd6a2484db92..c026ff6883311f2a9b16a4326ad1da97c6c3d4f4 100644 (file)
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -35,6 +35,8 @@
 #include "sysemu/sysemu.h"
 #include <nfsc/libnfs.h>
 
+#define QEMU_NFS_MAX_READAHEAD_SIZE 1048576
+
 typedef struct NFSClient {
     struct nfs_context *context;
     struct nfsfh *fh;
@@ -172,7 +174,11 @@ static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
 
     nfs_co_init_task(client, &task);
 
-    buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+    buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+    if (nb_sectors && buf == NULL) {
+        return -ENOMEM;
+    }
+
     qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
 
     if (nfs_pwrite_async(client->context, client->fh,
@@ -323,6 +329,11 @@ static int64_t nfs_client_open(NFSClient *client, const char *filename,
             nfs_set_tcp_syncnt(client->context, val);
 #ifdef LIBNFS_FEATURE_READAHEAD
         } else if (!strcmp(qp->p[i].name, "readahead")) {
+            if (val > QEMU_NFS_MAX_READAHEAD_SIZE) {
+                error_report("NFS Warning: Truncating NFS readahead"
+                             " size to %d", QEMU_NFS_MAX_READAHEAD_SIZE);
+                val = QEMU_NFS_MAX_READAHEAD_SIZE;
+            }
             nfs_set_readahead(client->context, val);
 #endif
         } else {
@@ -389,28 +400,46 @@ static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags,
     qemu_opts_absorb_qdict(opts, options, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
-        return -EINVAL;
+        ret = -EINVAL;
+        goto out;
     }
     ret = nfs_client_open(client, qemu_opt_get(opts, "filename"),
                           (flags & BDRV_O_RDWR) ? O_RDWR : O_RDONLY,
                           errp);
     if (ret < 0) {
-        return ret;
+        goto out;
     }
     bs->total_sectors = ret;
-    return 0;
+    ret = 0;
+out:
+    qemu_opts_del(opts);
+    return ret;
 }
 
+static QemuOptsList nfs_create_opts = {
+    .name = "nfs-create-opts",
+    .head = QTAILQ_HEAD_INITIALIZER(nfs_create_opts.head),
+    .desc = {
+        {
+            .name = BLOCK_OPT_SIZE,
+            .type = QEMU_OPT_SIZE,
+            .help = "Virtual disk size"
+        },
+        { /* end of list */ }
+    }
+};
+
 static int nfs_file_create(const char *url, QemuOpts *opts, Error **errp)
 {
     int ret = 0;
     int64_t total_size = 0;
-    NFSClient *client = g_malloc0(sizeof(NFSClient));
+    NFSClient *client = g_new0(NFSClient, 1);
 
     client->aio_context = qemu_get_aio_context();
 
     /* Read out options */
-    total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
+    total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
+                          BDRV_SECTOR_SIZE);
 
     ret = nfs_client_open(client, url, O_CREAT, errp);
     if (ret < 0) {
@@ -461,6 +490,8 @@ static BlockDriver bdrv_nfs = {
 
     .instance_size                  = sizeof(NFSClient),
     .bdrv_needs_filename            = true,
+    .create_opts                    = &nfs_create_opts,
+
     .bdrv_has_zero_init             = nfs_has_zero_init,
     .bdrv_get_allocated_file_size   = nfs_get_allocated_file_size,
     .bdrv_truncate                  = nfs_file_truncate,