diff options
| author | Programmingkid <programmingkidx@gmail.com> | 2015-11-20 19:17:48 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-25 14:27:43 +0100 |
| commit | 98caa5bc0083ed4fe4833addd3078b56ce2f6cfa (patch) | |
| tree | aaf4eaf1ff797ee530bbb6b6c94cebaedb0cacad /block/raw-posix.c | |
| parent | 8e37ca6d0be8aae2887c167da783fd2d9536c962 (diff) | |
raw-posix.c: Make GetBSDPath() handle caching options
Add support for caching options that can be specified from the command
line.
The CD-ROM raw char device bypasses the host page cache and therefore
has alignment requirements. Alignment probing is necessary so only use
the raw char device if BDRV_O_NOCACHE is set.
This patch fixes -cdrom /dev/cdrom on Mac OS X hosts, where bdrv_read()
used to fail due to misaligned requests during image format probing.
Signed-off-by: John Arbuckle <programmingkidx@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/raw-posix.c')
| -rw-r--r-- | block/raw-posix.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c index aec9ec6bbb..d9162fd306 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -1976,8 +1976,8 @@ BlockDriver bdrv_file = { #if defined(__APPLE__) && defined(__MACH__) static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ); -static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ); - +static kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, + CFIndex maxPathSize, int flags); kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ) { kern_return_t kernResult; @@ -2004,7 +2004,8 @@ kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator ) return kernResult; } -kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize ) +kern_return_t GetBSDPath(io_iterator_t mediaIterator, char *bsdPath, + CFIndex maxPathSize, int flags) { io_object_t nextMedia; kern_return_t kernResult = KERN_FAILURE; @@ -2017,7 +2018,9 @@ kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex ma if ( bsdPathAsCFString ) { size_t devPathLength; strcpy( bsdPath, _PATH_DEV ); - strcat( bsdPath, "r" ); + if (flags & BDRV_O_NOCACHE) { + strcat(bsdPath, "r"); + } devPathLength = strlen( bsdPath ); if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) { kernResult = KERN_SUCCESS; @@ -2129,8 +2132,8 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags, int fd; kernResult = FindEjectableCDMedia( &mediaIterator ); - kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) ); - + kernResult = GetBSDPath(mediaIterator, bsdPath, sizeof(bsdPath), + flags); if ( bsdPath[ 0 ] != '\0' ) { strcat(bsdPath,"s0"); /* some CDs don't have a partition 0 */ |