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| author | Christoph Hellwig <hch@lst.de> | 2011-09-21 01:10:37 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-10-11 09:41:46 +0200 |
| commit | 55b949c84761ade81ca93b2596ea45b09ad6d60a (patch) | |
| tree | 738a719da6789b0e8fa2adf6513e50a1842b9780 | |
| parent | ebffe2afceb1a17b5d134b5debf553955fe5ea1a (diff) | |
| download | qemu-55b949c84761ade81ca93b2596ea45b09ad6d60a.zip qemu-55b949c84761ade81ca93b2596ea45b09ad6d60a.tar.gz qemu-55b949c84761ade81ca93b2596ea45b09ad6d60a.tar.bz2 | |
block: allow resizing of images residing on host devices
Allow to resize images that reside on host devices up to the available
space. This allows to grow images after resizing the device manually or
vice versa.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/raw-posix.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c index 305998d..0b5e225 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -649,10 +649,24 @@ static void raw_close(BlockDriverState *bs) static int raw_truncate(BlockDriverState *bs, int64_t offset) { BDRVRawState *s = bs->opaque; - if (s->type != FTYPE_FILE) - return -ENOTSUP; - if (ftruncate(s->fd, offset) < 0) + struct stat st; + + if (fstat(s->fd, &st)) { return -errno; + } + + if (S_ISREG(st.st_mode)) { + if (ftruncate(s->fd, offset) < 0) { + return -errno; + } + } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) { + if (offset > raw_getlength(bs)) { + return -EINVAL; + } + } else { + return -ENOTSUP; + } + return 0; } @@ -1178,6 +1192,7 @@ static BlockDriver bdrv_host_device = { .bdrv_read = raw_read, .bdrv_write = raw_write, + .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, @@ -1299,6 +1314,7 @@ static BlockDriver bdrv_host_floppy = { .bdrv_read = raw_read, .bdrv_write = raw_write, + .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, @@ -1400,6 +1416,7 @@ static BlockDriver bdrv_host_cdrom = { .bdrv_read = raw_read, .bdrv_write = raw_write, + .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, @@ -1521,6 +1538,7 @@ static BlockDriver bdrv_host_cdrom = { .bdrv_read = raw_read, .bdrv_write = raw_write, + .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, .bdrv_get_allocated_file_size = raw_get_allocated_file_size, |