DLPX-78891 stbtrace zpl fails due to uid_t

[brad-lewis]

Akash found this while working on new stbtrace tests.

$ sudo python3 /usr/bin/stbtrace zpl
/virtual/main.c:51:54: error: unknown type name 'uio_t'; did you mean 'uid_t'?
int zfs_read_start(struct pt_regs *ctx, void *inode, uio_t *uio)
                                                     ^~~~~
                                                     uid_t
include/linux/types.h:32:26: note: 'uid_t' declared here
typedef __kernel_uid32_t        uid_t;
                                ^
/virtual/main.c:57:20: error: member reference base type 'uid_t' (aka 'unsigned int') is not a structure or union
    data.size = uio->uio_resid;
                ~~~^ ~~~~~~~~~
/virtual/main.c:65:55: error: unknown type name 'uio_t'; did you mean 'uid_t'?
int zfs_write_start(struct pt_regs *ctx, void *inode, uio_t *uio)
                                                      ^~~~~
                                                      uid_t
include/linux/types.h:32:26: note: 'uid_t' declared here
typedef __kernel_uid32_t        uid_t;
                                ^
/virtual/main.c:71:20: error: member reference base type 'uid_t' (aka 'unsigned int') is not a structure or union
    data.size = uio->uio_resid;
                ~~~^ ~~~~~~~~~
4 errors generated.
Failed to compile BPF module <text>

The estat script was previously updated (sadly the stbtrace counterpart was neglected at that time).

I verfied that this compiles and give reasonable data:
aws

$ sudo cmd/stbtrace.py zpl
{"t":"1640198205", "op":"write", "sync":"0", "cached":"-1", "count":"5", "avgLatency":"48221", "throughput":"49152", "latency":"{30000,1},{50000,3},{70000,1}", "size":"{16383,4},{32767,1}"}

{"t":"1640198206", "op":"write", "sync":"0", "cached":"-1", "count":"5", "avgLatency":"47128", "throughput":"49152", "latency":"{40000,1},{50000,3},{60000,1}", "size":"{16383,4},{32767,1}"}

{"t":"1640198207", "op":"write", "sync":"0", "cached":"-1", "count":"109", "avgLatency":"17016", "throughput":"59316", "latency":"{10000,83},{20000,9},{30000,1},{50000,5},{60000,4},{70000,1},{80000,2},{90000,1},{100000,1},{200000,2}", "size":"{63,24},{127,2},{255,52},{511,26},{16383,5}"}

{"t":"1640198207", "op":"read", "sync":"-1", "cached":"1", "count":"120", "avgLatency":"2230", "throughput":"88176", "latency":"{10000,119},{90000,1}", "size":"{31,4},{127,4},{511,12},{1023,100}"}
...

dcol1

$ sudo cmd/stbtrace.py zpl
{"t":"1640197738", "op":"write", "sync":"0", "cached":"-1", "count":"1", "avgLatency":"48101", "throughput":"8192", "latency":"{50000,1}", "size":"{16383,1}"}

{"t":"1640197739", "op":"write", "sync":"0", "cached":"-1", "count":"257", "avgLatency":"9362", "throughput":"81685", "latency":"{10000,211},{20000,31},{30000,3},{40000,1},{50000,9},{70000,2}", "size":"{63,49},{127,41},{255,110},{511,52},{16383,5}"}

{"t":"1640197739", "op":"read", "sync":"-1", "cached":"1", "count":"176", "avgLatency":"1983", "throughput":"110160", "latency":"{10000,174},{20000,2}", "size":"{31,12},{127,12},{511,36},{1023,116}"}
...