diff options
| author | Pavel Shilovsky <pshilov@microsoft.com> | 2019-01-25 11:59:01 -0800 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2019-03-05 18:10:01 -0600 |
| commit | 3e9529944d4177bd3a0952f4e7fe4f76c0f9bf6f (patch) | |
| tree | db847ea4a4550c488b785175edd4f0f0c74546d5 /fs/cifs/file.c | |
| parent | f0b93cb9d10789381c2c8c3bcab2315c3dcb3311 (diff) | |
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>
Diffstat (limited to 'fs/cifs/file.c')
| -rw-r--r-- | fs/cifs/file.c | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 67b361afb076..eaf5acba7f6b 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -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); } |