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mount: Add phys_stat_dev_match helper

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This helper serves to hide fs specifics (in particular
btrfs) thus the caller won't need the details.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2013-12-04 19:15:12 +04:00
committed by Pavel Emelyanov
parent c9069ba09f
commit e54ad19a06
2 changed files with 16 additions and 0 deletions
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2
include/mount.h
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@@ -22,4 +22,6 @@ extern struct mount_info *lookup_mnt_sdev(unsigned int s_dev);
extern struct ns_desc mnt_ns_desc; extern struct ns_desc mnt_ns_desc;
extern bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev);
#endif /* __CR_MOUNT_H__ */ #endif /* __CR_MOUNT_H__ */

14
mount.c
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@@ -18,6 +18,7 @@
#include "util-pie.h" #include "util-pie.h"
#include "log.h" #include "log.h"
#include "mount.h" #include "mount.h"
#include "mount-btrfs.h"
#include "pstree.h" #include "pstree.h"
#include "proc_parse.h" #include "proc_parse.h"
#include "image.h" #include "image.h"
@@ -97,6 +98,19 @@ struct mount_info *lookup_mnt_sdev(unsigned int s_dev)
return NULL; return NULL;
} }
bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev)
{
if (st_dev == phys_dev)
return true;
/*
* BTRFS returns subvolume dev-id instead of
* superblock dev-id so we might need additional
* tests here.
*/
return is_btrfs_subvol(phys_dev, st_dev);
}
/* /*
* Comparer two mounts. Return true if only mount points are differ. * Comparer two mounts. Return true if only mount points are differ.
* Don't care about root and mountpoints, if bind is true. * Don't care about root and mountpoints, if bind is true.