diff options
| 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 /block/raw-posix.c | |
| parent | ebffe2afceb1a17b5d134b5debf553955fe5ea1a (diff) | |
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>
Diffstat (limited to 'block/raw-posix.c')
| -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 305998ddb..0b5e225ba 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, |