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cow: stop using mmap

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We don't have an equivalent to mmap in the qemu block API, so read and
write the bitmap directly.  At least in the dumb implementation added
in this patch this is a lot less efficient, but it means cow can also
work on windows, and over nbd or curl.  And it fixes qemu-iotests testcase
012 which did not work properly due to issues with read-only mmap access.

In addition we can also get rid of the now unused get_mmap_addr function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2010-06-07 12:06:37 +02:00 • committed by Kevin Wolf
parent 122bb9e32d
commit 893a9cb47c
3 changed files with 61 additions and 45 deletions
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3
qemu-common.h
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@ -164,9 +164,6 @@ void qemu_free(void *ptr);
char *qemu_strdup(const char *str);
char *qemu_strndup(const char *str, size_t size);
void *get_mmap_addr(unsigned long size);
void qemu_mutex_lock_iothread(void);
void qemu_mutex_unlock_iothread(void);