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9p pull request for inclusion in 5.7 

- Fix read with O_NONBLOCK to allow incomplete read and return immediately
 - Rest is just cleanup (indent, unused field in struct, extra semicolon)
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Merge tag '9p-for-5.7' of git://github.com/martinetd/linux

Pull 9p updates from Dominique Martinet:
 "Not much new, but a few patches for this cycle:

   - Fix read with O_NONBLOCK to allow incomplete read and return
     immediately

   - Rest is just cleanup (indent, unused field in struct, extra
     semicolon)"

* tag '9p-for-5.7' of git://github.com/martinetd/linux:
  net/9p: remove unused p9_req_t aux field
  9p: read only once on O_NONBLOCK
  9pnet: allow making incomplete read requests
  9p: Remove unneeded semicolon
  9p: Fix Kconfig indentation
This commit is contained in:
Linus Torvalds 2020-04-06 08:46:59 -07:00
parent 77a73eecd4 43657496e4
commit e14679b62d
5 changed files with 94 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/9p/vfs_file.c
View File

@ -388,6 +388,9 @@ v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
iov_iter_count(to), iocb->ki_pos);
if (iocb->ki_filp->f_flags & O_NONBLOCK)
ret = p9_client_read_once(fid, iocb->ki_pos, to, &err);
else
ret = p9_client_read(fid, iocb->ki_pos, to, &err);
if (!ret)
return err;

2
fs/9p/vfs_inode.c
View File

@ -143,7 +143,7 @@ static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
default:
p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
type, stat->extension);
};
}
*rdev = MKDEV(major, minor);
} else
res |= S_IFREG;

4
include/net/9p/client.h
View File

@ -73,7 +73,6 @@ enum p9_req_status_t {
* @wq: wait_queue for the client to block on for this request
* @tc: the request fcall structure
* @rc: the response fcall structure
* @aux: transport specific data (provided for trans_fd migration)
* @req_list: link for higher level objects to chain requests
*/
struct p9_req_t {
@ -83,7 +82,6 @@ struct p9_req_t {
wait_queue_head_t wq;
struct p9_fcall tc;
struct p9_fcall rc;
void *aux;
struct list_head req_list;
};
@ -200,6 +198,8 @@ int p9_client_fsync(struct p9_fid *fid, int datasync);
int p9_client_remove(struct p9_fid *fid);
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags);
int p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err);
int p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
int *err);
int p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err);
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset);
int p9dirent_read(struct p9_client *clnt, char *buf, int len,

48
net/9p/client.c
View File

@ -1549,19 +1549,36 @@ EXPORT_SYMBOL(p9_client_unlinkat);
int
p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
{
struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
int total = 0;
*err = 0;
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
while (iov_iter_count(to)) {
int count;
count = p9_client_read_once(fid, offset, to, err);
if (!count || *err)
break;
offset += count;
total += count;
}
return total;
}
EXPORT_SYMBOL(p9_client_read);
int
p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
int *err)
{
struct p9_client *clnt = fid->clnt;
struct p9_req_t *req;
int count = iov_iter_count(to);
int rsize, non_zc = 0;
char *dataptr;
*err = 0;
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
rsize = fid->iounit;
if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
rsize = clnt->msize - P9_IOHDRSZ;
@ -1571,8 +1588,7 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
/* Don't bother zerocopy for small IO (< 1024) */
if (clnt->trans_mod->zc_request && rsize > 1024) {
/*
* response header len is 11
/* response header len is 11
* PDU Header(7) + IO Size (4)
*/
req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
@ -1585,7 +1601,7 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
}
if (IS_ERR(req)) {
*err = PTR_ERR(req);
break;
return 0;
}
*err = p9pdu_readf(&req->rc, clnt->proto_version,
@ -1593,7 +1609,7 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
if (*err) {
trace_9p_protocol_dump(clnt, &req->rc);
p9_tag_remove(clnt, req);
break;
return 0;
}
if (rsize < count) {
pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
@ -1603,28 +1619,24 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
if (!count) {
p9_tag_remove(clnt, req);
break;
return 0;
}
if (non_zc) {
int n = copy_to_iter(dataptr, count, to);
total += n;
offset += n;
if (n != count) {
*err = -EFAULT;
p9_tag_remove(clnt, req);
break;
return n;
}
} else {
iov_iter_advance(to, count);
total += count;
offset += count;
}
p9_tag_remove(clnt, req);
return count;
}
return total;
}
EXPORT_SYMBOL(p9_client_read);
EXPORT_SYMBOL(p9_client_read_once);
int
p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)