libmount statmount support #3092
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Restructure #ifdefs in mount-api-utils.h to allow for the addition of other components, such as fallbacks for statmount(). Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Since the Linux kernel version 6.8, there are two types of IDs available: the "old" ID used in /proc/self/mountinfo, and a new 64-bit unique ID that is never recycled. This new ID is provided by the statx(STATX_MNT_ID_UNIQUE) and statmount() syscalls. Note that this patch only adds the API for retrieving these unique IDs, but the backing code has not been implemented yet. Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
This change allows propagation flags to be retained from another source, such as statmount(). Signed-off-by: Karel Zak <kzak@redhat.com>
Optimize statx() call to reduce cost as much as possible. Signed-off-by: Karel Zak <kzak@redhat.com>
It's exported by kernel in statmount->sb_flags, but not defined in any uapi kernel header :-( Signed-off-by: Karel Zak <kzak@redhat.com>
* add mnt_fs_fetch_statmount() * add mnt_fs_enable_statmount() * add mnt_fs_set_uniq_id() * add uniq IDs and propagation to mnt_fs_print_debug() Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
* add docs * sort mnt_fs_* functions in docs Signed-off-by: Karel Zak <kzak@redhat.com>
* fetch only data necessary for mnt_fs_get_...() functions * add mask to mnt_fs_enable_statmount() to define default mask * add mask to mnt_fs_fetch_statmount() to define what caller needs (zero means everything). Signed-off-by: Karel Zak <kzak@redhat.com>
The file fs.c is large enough. Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
* Check for relevant structs and macros for statmount and listmount * Add fallback for syscalls if the libc does not define relevant SYS_* macros Signed-off-by: Karel Zak <kzak@redhat.com>
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The new syscalls are already being used in many places within the library, so it would be better to keep the syscalls header file within the private main library header file. Signed-off-by: Karel Zak <kzak@redhat.com>
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