[Qemu-block] [PULL 07/19] qemu-img: Improve documentation for PREALLOC_MODE_FALLOC

[Kevin Wolf]

From: Nir Soffer <address@hidden>

Now that we are truncating the file in both PREALLOC_MODE_FULL and
PREALLOC_MODE_OFF, not truncating in PREALLOC_MODE_FALLOC looks odd.
Add a comment explaining why we do not truncate in this case.

Signed-off-by: Nir Soffer <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 block/file-posix.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index d24e34b..4de1abd 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1594,9 +1594,14 @@ static int raw_create(const char *filename, QemuOpts 
*opts, Error **errp)
     switch (prealloc) {
 #ifdef CONFIG_POSIX_FALLOCATE
     case PREALLOC_MODE_FALLOC:
-        /* posix_fallocate() doesn't set errno. */
+        /*
+         * Truncating before posix_fallocate() makes it about twice slower on
+         * file systems that do not support fallocate(), trying to check if a
+         * block is allocated before allocating it, so don't do that here.
+         */
         result = -posix_fallocate(fd, 0, total_size);
         if (result != 0) {
+            /* posix_fallocate() doesn't set errno. */
             error_setg_errno(errp, -result,
                              "Could not preallocate data for the new file");
         }
-- 
1.8.3.1