diff options
| author | David Howells <dhowells@redhat.com> | 2022-01-14 17:39:55 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2023-12-28 09:45:23 +0000 |
| commit | 016dc8516aec8719641e7aaaacd78d344759178e (patch) | |
| tree | 15cc93a54ddfa05ffc558b1bff50aa655ce926ce /include/trace | |
| parent | e2e2e83924b1fe4c28bf5617db90e893755e9cbd (diff) | |
netfs: Implement unbuffered/DIO read support
Implement support for unbuffered and DIO reads in the netfs library,
utilising the existing read helper code to do block splitting and
individual queuing. The code also handles extraction of the destination
buffer from the supplied iterator, allowing async unbuffered reads to take
place.
The read will be split up according to the rsize setting and, if supplied,
the ->clamp_length() method. Note that the next subrequest will be issued
as soon as issue_op returns, without waiting for previous ones to finish.
The network filesystem needs to pause or handle queuing them if it doesn't
want to fire them all at the server simultaneously.
Once all the subrequests have finished, the state will be assessed and the
amount of data to be indicated as having being obtained will be
determined. As the subrequests may finish in any order, if an intermediate
subrequest is short, any further subrequests may be copied into the buffer
and then abandoned.
In the future, this will also take care of doing an unbuffered read from
encrypted content, with the decryption being done by the library.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/netfs.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h index 082a5e717b58..5a4edadf0e59 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -16,6 +16,7 @@ * Define enums for tracing information. */ #define netfs_read_traces \ + EM(netfs_read_trace_dio_read, "DIO-READ ") \ EM(netfs_read_trace_expanded, "EXPANDED ") \ EM(netfs_read_trace_readahead, "READAHEAD") \ EM(netfs_read_trace_readpage, "READPAGE ") \ @@ -31,7 +32,8 @@ EM(NETFS_READAHEAD, "RA") \ EM(NETFS_READPAGE, "RP") \ EM(NETFS_READ_FOR_WRITE, "RW") \ - E_(NETFS_WRITEBACK, "WB") + EM(NETFS_WRITEBACK, "WB") \ + E_(NETFS_DIO_READ, "DR") #define netfs_rreq_traces \ EM(netfs_rreq_trace_assess, "ASSESS ") \ @@ -70,6 +72,8 @@ #define netfs_failures \ EM(netfs_fail_check_write_begin, "check-write-begin") \ EM(netfs_fail_copy_to_cache, "copy-to-cache") \ + EM(netfs_fail_dio_read_short, "dio-read-short") \ + EM(netfs_fail_dio_read_zero, "dio-read-zero") \ EM(netfs_fail_read, "read") \ EM(netfs_fail_short_read, "short-read") \ EM(netfs_fail_prepare_write, "prep-write") \ @@ -81,6 +85,7 @@ EM(netfs_rreq_trace_put_complete, "PUT COMPLT ") \ EM(netfs_rreq_trace_put_discard, "PUT DISCARD") \ EM(netfs_rreq_trace_put_failed, "PUT FAILED ") \ + EM(netfs_rreq_trace_put_no_submit, "PUT NO-SUBM") \ EM(netfs_rreq_trace_put_return, "PUT RETURN ") \ EM(netfs_rreq_trace_put_subreq, "PUT SUBREQ ") \ EM(netfs_rreq_trace_put_work, "PUT WORK ") \ |