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btrfs-progs: move lookup_path_rootid to library utils

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The refactoring in commit 1c85c3de5a has
broken use of libbtrfs that does not exhibit during build but at the run
time.

Fixes: 1c85c3de5a
Bugzilla: https://bugs.gentoo.org/show_bug.cgi?id=600078
Reported-by: Mike Gilbert <floppymaster@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-11-23 10:36:43 +01:00
parent f8278f94ff
commit e5362f5feb
2 changed files with 30 additions and 25 deletions
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30
utils-lib.c
View File

@ -2,9 +2,13 @@
#include <unistd.h> #include <unistd.h>
#include <stdlib.h> #include <stdlib.h>
#include <limits.h> #include <limits.h>
#include <sys/ioctl.h>
#include <ioctl.h>
#if BTRFS_FLAT_INCLUDES #if BTRFS_FLAT_INCLUDES
#include "ctree.h"
#else #else
#include <btrfs/ctree.h>
#endif /* BTRFS_FLAT_INCLUDES */ #endif /* BTRFS_FLAT_INCLUDES */
/* /*
@ -38,3 +42,29 @@ u64 arg_strtou64(const char *str)
} }
return value; return value;
} }
/*
* For a given:
* - file or directory return the containing tree root id
* - subvolume return its own tree id
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
* undefined and function returns -1
*/
int lookup_path_rootid(int fd, u64 *rootid)
{
struct btrfs_ioctl_ino_lookup_args args;
int ret;
memset(&args, 0, sizeof(args));
args.treeid = 0;
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
if (ret < 0)
return -errno;
*rootid = args.treeid;
return 0;
}

25
utils.c
View File

@ -3646,31 +3646,6 @@ int ask_user(const char *question)
(!strcasecmp(answer, "yes") || !strcasecmp(answer, "y")); (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
} }
/*
* For a given:
* - file or directory return the containing tree root id
* - subvolume return its own tree id
* - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
* undefined and function returns -1
*/
int lookup_path_rootid(int fd, u64 *rootid)
{
struct btrfs_ioctl_ino_lookup_args args;
int ret;
memset(&args, 0, sizeof(args));
args.treeid = 0;
args.objectid = BTRFS_FIRST_FREE_OBJECTID;
ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
if (ret < 0)
return -errno;
*rootid = args.treeid;
return 0;
}
/* /*
* return 0 if a btrfs mount point is found * return 0 if a btrfs mount point is found
* return 1 if a mount point is found but not btrfs * return 1 if a mount point is found but not btrfs