From 55b949c84761ade81ca93b2596ea45b09ad6d60a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 21 Sep 2011 01:10:37 +0200 Subject: [PATCH] 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 Signed-off-by: Kevin Wolf --- block/raw-posix.c | 24 +++++++++++++++++++++--- 1 file 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, -- 2.7.4