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SubjectRe: [Patch v2 13/15] CIFS: Add support for direct I/O read
Hi Long,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v4.17-rc6]
[cannot apply to cifs/for-next next-20180601]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Long-Li/CIFS-Add-direct-I-O-support/20180602-130240
config: i386-randconfig-x008-201821 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
fs//cifs/file.c: In function 'cifs_direct_readv':
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:410:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:54:3: note: in expansion of macro 'pr_debug_once'
pr_debug_ ## ratefunc("%s: " \
^~~~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:410:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:54:3: note: in expansion of macro 'pr_debug_once'
pr_debug_ ## ratefunc("%s: " \
^~~~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:357:10: note: in definition of macro 'printk_once'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
#define KERN_ERR KERN_SOH "3" /* error conditions */
^~~~~~~~
include/linux/printk.h:386:14: note: in expansion of macro 'KERN_ERR'
printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~
fs//cifs/cifs_debug.h:57:3: note: in expansion of macro 'pr_err_once'
pr_err_ ## ratefunc("CIFS VFS: " \
^~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:357:10: note: in definition of macro 'printk_once'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
#define KERN_ERR KERN_SOH "3" /* error conditions */
^~~~~~~~
include/linux/printk.h:386:14: note: in expansion of macro 'KERN_ERR'
printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~
fs//cifs/cifs_debug.h:57:3: note: in expansion of macro 'pr_err_once'
pr_err_ ## ratefunc("CIFS VFS: " \
^~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:410:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:60:3: note: in expansion of macro 'pr_debug_once'
pr_debug_ ## ratefunc(fmt, ##__VA_ARGS__); \
^~~~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:410:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:60:3: note: in expansion of macro 'pr_debug_once'
pr_debug_ ## ratefunc(fmt, ##__VA_ARGS__); \
^~~~~~~~~
fs//cifs/cifs_debug.h:67:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(once, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:474:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:54:3: note: in expansion of macro 'pr_debug_ratelimited'
pr_debug_ ## ratefunc("%s: " \
^~~~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 6 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:474:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:54:3: note: in expansion of macro 'pr_debug_ratelimited'
pr_debug_ ## ratefunc("%s: " \
^~~~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:425:10: note: in definition of macro 'printk_ratelimited'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
#define KERN_ERR KERN_SOH "3" /* error conditions */
^~~~~~~~
include/linux/printk.h:439:21: note: in expansion of macro 'KERN_ERR'
printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~
fs//cifs/cifs_debug.h:57:3: note: in expansion of macro 'pr_err_ratelimited'
pr_err_ ## ratefunc("CIFS VFS: " \
^~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:425:10: note: in definition of macro 'printk_ratelimited'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
#define KERN_ERR KERN_SOH "3" /* error conditions */
^~~~~~~~
include/linux/printk.h:439:21: note: in expansion of macro 'KERN_ERR'
printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~
fs//cifs/cifs_debug.h:57:3: note: in expansion of macro 'pr_err_ratelimited'
pr_err_ ## ratefunc("CIFS VFS: " \
^~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:474:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:60:3: note: in expansion of macro 'pr_debug_ratelimited'
pr_debug_ ## ratefunc(fmt, ##__VA_ARGS__); \
^~~~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:20: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u
In file included from include/linux/kernel.h:14:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from fs//cifs/file.c:24:
include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'size_t {aka unsigned int}' [-Wformat=]
#define KERN_SOH "\001" /* ASCII Start Of Header */
^
include/linux/printk.h:136:10: note: in definition of macro 'no_printk'
printk(fmt, ##__VA_ARGS__); \
^~~
include/linux/kern_levels.h:15:20: note: in expansion of macro 'KERN_SOH'
#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
^~~~~~~~
include/linux/printk.h:474:12: note: in expansion of macro 'KERN_DEBUG'
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~~~
fs//cifs/cifs_debug.h:60:3: note: in expansion of macro 'pr_debug_ratelimited'
pr_debug_ ## ratefunc(fmt, ##__VA_ARGS__); \
^~~~~~~~~
fs//cifs/cifs_debug.h:70:3: note: in expansion of macro 'cifs_dbg_func'
cifs_dbg_func(ratelimited, \
^~~~~~~~~~~~~
>> fs//cifs/file.c:3346:4: note: in expansion of macro 'cifs_dbg'
cifs_dbg(VFS,
^~~~~~~~
fs//cifs/file.c:3348:30: note: format string is defined here
" iov_offset %lu count %lu\n",
~~^
%u

vim +/cifs_dbg +3346 fs//cifs/file.c

3290
3291 ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to)
3292 {
3293 size_t len, cur_len, start;
3294 unsigned int npages, rsize, credits;
3295 struct file *file;
3296 struct cifs_sb_info *cifs_sb;
3297 struct cifsFileInfo *cfile;
3298 struct cifs_tcon *tcon;
3299 struct page **pagevec;
3300 ssize_t rc, total_read = 0;
3301 struct TCP_Server_Info *server;
3302 loff_t offset = iocb->ki_pos;
3303 pid_t pid;
3304 struct cifs_readdata *rdata;
3305
3306 /*
3307 * iov_iter_get_pages_alloc() doesn't work with ITER_KVEC,
3308 * fall back to data copy read path
3309 */
3310 if (to->type & ITER_KVEC) {
3311 cifs_dbg(FYI, "use non-direct cifs_user_readv for kvec I/O\n");
3312 return cifs_user_readv(iocb, to);
3313 }
3314
3315 len = iov_iter_count(to);
3316 if (!len)
3317 return 0;
3318
3319 file = iocb->ki_filp;
3320 cifs_sb = CIFS_FILE_SB(file);
3321 cfile = file->private_data;
3322 tcon = tlink_tcon(cfile->tlink);
3323 server = tcon->ses->server;
3324
3325 if (!server->ops->async_readv)
3326 return -ENOSYS;
3327
3328 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
3329 pid = cfile->pid;
3330 else
3331 pid = current->tgid;
3332
3333 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
3334 cifs_dbg(FYI, "attempting read on write only file instance\n");
3335
3336 do {
3337 rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
3338 &rsize, &credits);
3339 if (rc)
3340 break;
3341
3342 cur_len = min_t(const size_t, len, rsize);
3343
3344 rc = iov_iter_get_pages_alloc(to, &pagevec, cur_len, &start);
3345 if (rc < 0) {
> 3346 cifs_dbg(VFS,
3347 "couldn't get user pages (rc=%zd) iter type %d"
3348 " iov_offset %lu count %lu\n",
3349 rc, to->type, to->iov_offset, to->count);
3350 dump_stack();
3351 break;
3352 }
3353
3354 rdata = cifs_readdata_direct_alloc(
3355 pagevec, cifs_direct_readv_complete);
3356 if (!rdata) {
3357 add_credits_and_wake_if(server, credits, 0);
3358 rc = -ENOMEM;
3359 break;
3360 }
3361
3362 npages = (rc + start + PAGE_SIZE-1) / PAGE_SIZE;
3363 rdata->nr_pages = npages;
3364 rdata->page_offset = start;
3365 rdata->pagesz = PAGE_SIZE;
3366 rdata->tailsz = npages > 1 ?
3367 rc-(PAGE_SIZE-start)-(npages-2)*PAGE_SIZE :
3368 rc;
3369 cur_len = rc;
3370
3371 rdata->cfile = cifsFileInfo_get(cfile);
3372 rdata->offset = offset;
3373 rdata->bytes = rc;
3374 rdata->pid = pid;
3375 rdata->read_into_pages = cifs_uncached_read_into_pages;
3376 rdata->copy_into_pages = cifs_uncached_copy_into_pages;
3377 rdata->credits = credits;
3378
3379 rc = 0;
3380 if (rdata->cfile->invalidHandle)
3381 rc = cifs_reopen_file(rdata->cfile, true);
3382
3383 if (!rc)
3384 rc = server->ops->async_readv(rdata);
3385
3386 if (rc) {
3387 add_credits_and_wake_if(server, rdata->credits, 0);
3388 kref_put(&rdata->refcount,
3389 cifs_direct_readdata_release);
3390 if (rc == -EAGAIN)
3391 continue;
3392 break;
3393 }
3394
3395 wait_for_completion(&rdata->done);
3396 rc = rdata->result;
3397 if (rc) {
3398 kref_put(
3399 &rdata->refcount,
3400 cifs_direct_readdata_release);
3401 if (rc == -EAGAIN)
3402 continue;
3403 break;
3404 }
3405
3406 total_read += rdata->got_bytes;
3407 kref_put(&rdata->refcount, cifs_direct_readdata_release);
3408
3409 iov_iter_advance(to, cur_len);
3410 len -= cur_len;
3411 offset += cur_len;
3412 } while (len);
3413
3414 iocb->ki_pos += total_read;
3415
3416 return total_read;
3417 }
3418

---
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