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CIFS: Find and reopen a file before get MTU credits in writepages

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Reorder finding and reopening a writable handle file and getting
MTU credits in writepages because we may be stuck on low credits
otherwise.

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 15:23:36 -08:00 committed by Steve French
parent 3e9529944d
commit c7d38dbe7d
1 changed files with 18 additions and 6 deletions
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24
fs/cifs/file.c
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@ -2096,15 +2096,16 @@ wdata_send_pages(struct TCP_Server_Info *server, struct cifs_writedata *wdata,
if (rc)
goto send_pages_out;
if (wdata->cfile != NULL)
cifsFileInfo_put(wdata->cfile);
wdata->cfile = find_writable_file(CIFS_I(mapping->host), false);
if (!wdata->cfile) {
cifs_dbg(VFS, "No writable handles for inode\n");
cifs_dbg(VFS, "No writable handle in writepages\n");
rc = -EBADF;
} else {
wdata->pid = wdata->cfile->pid;
rc = server->ops->async_writev(wdata, cifs_writedata_release);
if (wdata->cfile->invalidHandle)
rc = -EAGAIN;
else
rc = server->ops->async_writev(wdata,
cifs_writedata_release);
}
send_pages_out:
@ -2117,11 +2118,13 @@ send_pages_out:
static int cifs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb);
struct inode *inode = mapping->host;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct TCP_Server_Info *server;
bool done = false, scanned = false, range_whole = false;
pgoff_t end, index;
struct cifs_writedata *wdata;
struct cifsFileInfo *cfile = NULL;
int rc = 0;
int saved_rc = 0;
unsigned int xid;
@ -2152,6 +2155,11 @@ retry:
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
if (cfile)
cifsFileInfo_put(cfile);
cfile = find_writable_file(CIFS_I(inode), false);
rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
&wsize, credits);
if (rc != 0) {
@ -2187,6 +2195,8 @@ retry:
}
wdata->credits = credits_on_stack;
wdata->cfile = cfile;
cfile = NULL;
rc = wdata_send_pages(server, wdata, nr_pages, mapping, wbc);
@ -2244,6 +2254,8 @@ retry:
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
mapping->writeback_index = index;
if (cfile)
cifsFileInfo_put(cfile);
free_xid(xid);
return rc;
}