From: Jeff Layton <jlayton@xxxxxxxxxx> This is a reworked (and more modest) version of the syncfs rework that I posted recently. Given that we have a new fsinfo syscall being introduced, we may as well use it to report writeback errors on a per superblock basis. This allows us to provide the info that the PostgreSQL developers wanted, without needing to change an existing interface. We may still want to change syncfs to report writeback errors at some point, but for now, I think this is a safer path to presenting this info. This seems to do the right thing when tested by hand, but I don't yet have an xfstest for it, since the syscall is still quite new. Once that goes in and we get fsinfo support in xfs_io, it should be rather trivial to modify the test I wrote for the syncfs rework. Jeff Layton (5): vfs: track per-sb writeback errors buffer: record blockdev write errors in super_block that backs them errseq: add a new errseq_scrape function vfs: allow fsinfo to fetch the current state of s_wb_err samples: extend test-fsinfo to access error_state fs/buffer.c | 2 ++ fs/statfs.c | 9 +++++++++ include/linux/errseq.h | 1 + include/linux/fs.h | 3 +++ include/linux/pagemap.h | 5 ++++- include/uapi/linux/fsinfo.h | 11 +++++++++++ lib/errseq.c | 33 +++++++++++++++++++++++++++++++-- samples/statx/test-fsinfo.c | 13 +++++++++++++ 8 files changed, 74 insertions(+), 3 deletions(-) -- 2.17.0
