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util: file: Add helper to determine whether a path is a CDROM
Add detection mechanism which will allow to check whether a path to a block device is a physical CDROM drive. This will be useful once we will need to pass it to hypervisors. The linux implementation uses an ioctl to do the detection, while the fallback uses a simple string prefix match. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
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@ -1781,6 +1781,7 @@ virFileGetMountSubtree;
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virFileHasSuffix;
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virFileInData;
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virFileIsAbsPath;
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virFileIsCDROM;
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virFileIsDir;
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virFileIsExecutable;
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virFileIsLink;
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@ -59,8 +59,9 @@
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# include <sys/statfs.h>
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# if HAVE_DECL_LO_FLAGS_AUTOCLEAR
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# include <linux/loop.h>
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# include <sys/ioctl.h>
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# endif
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# include <sys/ioctl.h>
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# include <linux/cdrom.h>
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#endif
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#include "configmake.h"
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@ -1938,6 +1939,59 @@ int virFileIsMountPoint(const char *file)
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}
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#if defined(__linux__)
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/**
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* virFileIsCDROM:
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* @path: File to check
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*
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* Returns 1 if @path is a cdrom device 0 if it is not a cdrom and -1 on
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* error. 'errno' of the failure is preserved and no libvirt errors are
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* reported.
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*/
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int
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virFileIsCDROM(const char *path)
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{
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struct stat st;
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int fd;
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int ret = -1;
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if ((fd = open(path, O_RDONLY | O_NONBLOCK)) < 0)
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goto cleanup;
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if (fstat(fd, &st) < 0)
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goto cleanup;
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if (!S_ISBLK(st.st_mode)) {
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ret = 0;
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goto cleanup;
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}
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/* Attempt to detect via a CDROM specific ioctl */
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if (ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT) >= 0)
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ret = 1;
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else
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ret = 0;
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cleanup:
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VIR_FORCE_CLOSE(fd);
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return ret;
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}
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#else
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int
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virFileIsCDROM(const char *path)
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{
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if (STRPREFIX(path, "/dev/cd", NULL) ||
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STRPREFIX(path, "/dev/acd", NULL))
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return 1;
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return 0;
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}
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#endif /* defined(__linux__) */
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#if defined HAVE_MNTENT_H && defined HAVE_GETMNTENT_R
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static int
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virFileGetMountSubtreeImpl(const char *mtabpath,
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@ -207,6 +207,8 @@ enum {
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int virFileIsSharedFSType(const char *path, int fstypes) ATTRIBUTE_NONNULL(1);
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int virFileIsSharedFS(const char *path) ATTRIBUTE_NONNULL(1);
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int virFileIsMountPoint(const char *file) ATTRIBUTE_NONNULL(1);
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int virFileIsCDROM(const char *path)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
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int virFileGetMountSubtree(const char *mtabpath,
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const char *prefix,
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