[Xen-changelog] [xen-3.2-testing] ioemu: cope with partial reads/writes when using the read()/write()

["Xen patchbot-3.2-testing" <patchbot-3.2-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1203343943 0
# Node ID 408acef82ffb5451bca9bd18fb5b3bf151eefc43
# Parent  f2811c8c09f000b2a5724397492401dde4553da4
ioemu: cope with partial reads/writes when using the read()/write()
syscall interfaces.
Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
xen-unstable changeset:   17018:a1b83b3b04491868d7e5aac594ed8ce0070d8c38
xen-unstable date:        Mon Feb 11 14:47:06 2008 +0000
---
 tools/ioemu/block-raw.c |   27 ++++++++++++++++++++-------
 1 files changed, 20 insertions(+), 7 deletions(-)

diff -r f2811c8c09f0 -r 408acef82ffb tools/ioemu/block-raw.c
--- a/tools/ioemu/block-raw.c   Mon Feb 18 14:09:56 2008 +0000
+++ b/tools/ioemu/block-raw.c   Mon Feb 18 14:12:23 2008 +0000
@@ -167,10 +167,16 @@ static int raw_pread(BlockDriverState *b
     }
     s->lseek_err_cnt=0;
 
-    ret = read(s->fd, buf, count);
-    if (ret == count) 
-        goto label__raw_read__success;
-    
+    uint64_t done;
+    for (done = 0; done < count; done += ret) {
+       ret = read(s->fd, buf + done, count - done);
+       if (ret == -1) 
+           goto label__raw_read__error;
+    }
+    ret = count;
+    goto label__raw_read__success;
+    
+label__raw_read__error:
     DEBUG_BLOCK_PRINT("raw_read(%d:%s, %" PRId64 ", %p, %d) [%" PRId64 "] read 
failed %d : %d = %s\n", 
         s->fd, 
         bs->filename, 
@@ -232,9 +238,16 @@ static int raw_pwrite(BlockDriverState *
     }
     s->lseek_err_cnt = 0;
 
-    ret = write(s->fd, buf, count);
-    if (ret == count) 
-        goto label__raw_write__success;
+    uint64_t done;
+    for (done = 0; done < count; done += ret) {
+       ret = write(s->fd, buf + done, count - done);
+       if (ret == -1) 
+           goto label__raw_write__error;
+    }
+    ret = count;
+    goto label__raw_write__success;
+
+label__raw_write__error:
     
     DEBUG_BLOCK_PRINT("raw_write(%d:%s, %" PRId64 ", %p, %d) [%" PRId64 "] 
write failed %d : %d = %s\n", 
         s->fd, 

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