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afs: Probe multiple fileservers simultaneously

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Send probes to all the unprobed fileservers in a fileserver list on all
addresses simultaneously in an attempt to find out the fastest route whilst
not getting stuck for 20s on any server or address that we don't get a
reply from.

This alleviates the problem whereby attempting to access a new server can
take a long time because the rotation algorithm ends up rotating through
all servers and addresses until it finds one that responds.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2018-10-20 00:57:59 +01:00
commit 3bf0fb6f33
17 changed files with 1050 additions and 350 deletions
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4
include/trace/events/afs.h
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@ -137,6 +137,7 @@ enum afs_io_error {
afs_io_error_extract,
afs_io_error_fs_probe_fail,
afs_io_error_vl_lookup_fail,
afs_io_error_vl_probe_fail,
};
enum afs_file_error {
@ -261,7 +262,8 @@ enum afs_file_error {
EM(afs_io_error_cm_reply, "CM_REPLY") \
EM(afs_io_error_extract, "EXTRACT") \
EM(afs_io_error_fs_probe_fail, "FS_PROBE_FAIL") \
E_(afs_io_error_vl_lookup_fail, "VL_LOOKUP_FAIL")
EM(afs_io_error_vl_lookup_fail, "VL_LOOKUP_FAIL") \
E_(afs_io_error_vl_probe_fail, "VL_PROBE_FAIL")
#define afs_file_errors \
EM(afs_file_error_dir_bad_magic, "DIR_BAD_MAGIC") \