OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

CIFS: Reopen file before get SMB2 MTU credits for async IO 

Currently we get MTU credits before we check an open file if
it needs to be reopened. Reopening the file in such conditions
leads to a possibility of being stuck waiting indefinitely
for credits in the transport layer. Fix this by reopening the
file first if needed and then getting MTU credits for async IO.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2019-01-25 11:59:01 -08:00 committed by Steve French
parent f0b93cb9d1
commit 3e9529944d
1 changed files with 30 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
fs/cifs/file.c
View File

@ -2650,6 +2650,14 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, false);
if (rc == -EAGAIN)
continue;
else if (rc)
break;
}
rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
&wsize, credits);
if (rc)
@ -2751,9 +2759,8 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
if (!rc) {
if (wdata->cfile->invalidHandle)
rc = cifs_reopen_file(wdata->cfile, false);
if (!rc)
rc = -EAGAIN;
else
rc = server->ops->async_writev(wdata,
cifs_uncached_writedata_release);
}
@ -3355,6 +3362,14 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
iov_iter_advance(&direct_iov, offset - ctx->pos);
do {
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc == -EAGAIN)
continue;
else if (rc)
break;
}
rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
&rsize, credits);
if (rc)
@ -3438,9 +3453,8 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
if (!rc) {
if (rdata->cfile->invalidHandle)
rc = cifs_reopen_file(rdata->cfile, true);
if (!rc)
rc = -EAGAIN;
else
rc = server->ops->async_readv(rdata);
}
@ -4127,6 +4141,14 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc == -EAGAIN)
continue;
else if (rc)
break;
}
rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
&rsize, credits);
if (rc)
@ -4185,9 +4207,8 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
if (!rc) {
if (rdata->cfile->invalidHandle)
rc = cifs_reopen_file(rdata->cfile, true);
if (!rc)
rc = -EAGAIN;
else
rc = server->ops->async_readv(rdata);
}