[LTP] [PATCH v4 0/3] Increase coverage for swapon syscall

[Andrea Cervesato]

Complete the EINVAL coverage on invalid input data and create a new test
to verify discarding pages functionalities.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
Changes in v4:
- replaced the manual /proc/swaps check with .needs_kconfigs = "CONFIG_SWAP=y"
- added .needs_cmds = "mkswap" to make sure that the binary exists
- switched from raw tst_syscall to standard swapon() and swapoff()
- used TST_EXP_PASS() to check the swapon() call
- truncated the backing file before checking FALLOC_FL_PUNCH_HOLE support
- added SAFE_FSYNC() before mkswap to flush data to disk
- changed TTERRNO to TERRNO for swapoff() errors
- removed redundant static flag resets in cleanup()
- added .skip_filesystems to skip filesystems that do not support punch hole
- Link to v3: https://lore.kernel.org/20260828-swapon_discard_coverage-v3-0-136924a1a730@suse.com

Changes in v3:
- better description for fallbacks
- swapon02: make sure we swapoff() if swapon() accidentally pass
- Link to v2: https://lore.kernel.org/20260828-swapon_discard_coverage-v2-0-e55a86dad729@suse.com

Changes in v2:
- ensure buffer is flushed after discard using fsync()
- add messages to show what test cases we are running
- Link to v1: https://lore.kernel.org/20260827-swapon_discard_coverage-v1-0-633bcb11c181@suse.com

To: Linux Test Project <ltp@lists.linux.it>

---
Andrea Cervesato (3):
      tse_swap: Add fallback definitions for swapon
      swapon04: Add test for discard flags
      swapon02: Add test cases for invalid swapflags

 include/tse_swap.h                          |  16 +++
 runtest/syscalls                            |   1 +
 testcases/kernel/syscalls/swapon/.gitignore |   1 +
 testcases/kernel/syscalls/swapon/swapon02.c |  59 ++++++--
 testcases/kernel/syscalls/swapon/swapon04.c | 208 ++++++++++++++++++++++++++++
 5 files changed, 270 insertions(+), 15 deletions(-)
---
base-commit: 12724413534a6d4160ff9694ba6f09daa4ccb6bd
change-id: 20260827-swapon_discard_coverage-34861d63fc55

Best regards,
--  
Andrea Cervesato <andrea.cervesato@suse.com>