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cifs: Remove unused code 

Remove a bunch of functions that are no longer used and are commented out
after the conversion to use iterators throughout the I/O path.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org

Link: https://lore.kernel.org/r/164928621823.457102.8777804402615654773.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165211421039.3154751.15199634443157779005.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165348881165.2106726.2993852968344861224.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165364827876.3334034.9331465096417303889.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/166126396915.708021.2010212654244139442.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/166697261080.61150.17513116912567922274.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/166732033255.3186319.5527423437137895940.stgit@warthog.procyon.org.uk/ # rfc
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2022-01-24 21:13:24 +00:00 committed by Steve French
parent 3d78fe73fa
commit 607aea3cc2
1 changed files with 0 additions and 606 deletions
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606
fs/cifs/file.c
View File

@ -2606,314 +2606,6 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
return rc;
}
#if 0 // TODO: Remove for iov_iter support
static struct cifs_writedata *
wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
pgoff_t end, pgoff_t *index,
unsigned int *found_pages)
{
struct cifs_writedata *wdata;
wdata = cifs_writedata_alloc((unsigned int)tofind,
cifs_writev_complete);
if (!wdata)
return NULL;
*found_pages = find_get_pages_range_tag(mapping, index, end,
PAGECACHE_TAG_DIRTY, tofind, wdata->pages);
return wdata;
}
static unsigned int
wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages,
struct address_space *mapping,
struct writeback_control *wbc,
pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done)
{
unsigned int nr_pages = 0, i;
struct page *page;
for (i = 0; i < found_pages; i++) {
page = wdata->pages[i];
/*
* At this point we hold neither the i_pages lock nor the
* page lock: the page may be truncated or invalidated
* (changing page->mapping to NULL), or even swizzled
* back from swapper_space to tmpfs file mapping
*/
if (nr_pages == 0)
lock_page(page);
else if (!trylock_page(page))
break;
if (unlikely(page->mapping != mapping)) {
unlock_page(page);
break;
}
if (!wbc->range_cyclic && page->index > end) {
*done = true;
unlock_page(page);
break;
}
if (*next && (page->index != *next)) {
/* Not next consecutive page */
unlock_page(page);
break;
}
if (wbc->sync_mode != WB_SYNC_NONE)
wait_on_page_writeback(page);
if (PageWriteback(page) ||
!clear_page_dirty_for_io(page)) {
unlock_page(page);
break;
}
/*
* This actually clears the dirty bit in the radix tree.
* See cifs_writepage() for more commentary.
*/
set_page_writeback(page);
if (page_offset(page) >= i_size_read(mapping->host)) {
*done = true;
unlock_page(page);
end_page_writeback(page);
break;
}
wdata->pages[i] = page;
*next = page->index + 1;
++nr_pages;
}
/* reset index to refind any pages skipped */
if (nr_pages == 0)
*index = wdata->pages[0]->index + 1;
/* put any pages we aren't going to use */
for (i = nr_pages; i < found_pages; i++) {
put_page(wdata->pages[i]);
wdata->pages[i] = NULL;
}
return nr_pages;
}
static int
wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages,
struct address_space *mapping, struct writeback_control *wbc)
{
int rc;
wdata->sync_mode = wbc->sync_mode;
wdata->nr_pages = nr_pages;
wdata->offset = page_offset(wdata->pages[0]);
wdata->pagesz = PAGE_SIZE;
wdata->tailsz = min(i_size_read(mapping->host) -
page_offset(wdata->pages[nr_pages - 1]),
(loff_t)PAGE_SIZE);
wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz;
wdata->pid = wdata->cfile->pid;
rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes);
if (rc)
return rc;
if (wdata->cfile->invalidHandle)
rc = -EAGAIN;
else
rc = wdata->server->ops->async_writev(wdata,
cifs_writedata_release);
return rc;
}
static int
cifs_writepage_locked(struct page *page, struct writeback_control *wbc);
static int cifs_write_one_page(struct page *page, struct writeback_control *wbc,
void *data)
{
struct address_space *mapping = data;
int ret;
ret = cifs_writepage_locked(page, wbc);
unlock_page(page);
mapping_set_error(mapping, ret);
return ret;
}
static int cifs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
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;
/*
* If wsize is smaller than the page cache size, default to writing
* one page at a time.
*/
if (cifs_sb->ctx->wsize < PAGE_SIZE)
return write_cache_pages(mapping, wbc, cifs_write_one_page,
mapping);
xid = get_xid();
if (wbc->range_cyclic) {
index = mapping->writeback_index; /* Start from prev offset */
end = -1;
} else {
index = wbc->range_start >> PAGE_SHIFT;
end = wbc->range_end >> PAGE_SHIFT;
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = true;
scanned = true;
}
server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses);
retry:
while (!done && index <= end) {
unsigned int i, nr_pages, found_pages, wsize;
pgoff_t next = 0, tofind, saved_index = index;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
int get_file_rc = 0;
if (cfile)
cifsFileInfo_put(cfile);
rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile);
/* in case of an error store it to return later */
if (rc)
get_file_rc = rc;
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
&wsize, credits);
if (rc != 0) {
done = true;
break;
}
tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1;
wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index,
&found_pages);
if (!wdata) {
rc = -ENOMEM;
done = true;
add_credits_and_wake_if(server, credits, 0);
break;
}
if (found_pages == 0) {
kref_put(&wdata->refcount, cifs_writedata_release);
add_credits_and_wake_if(server, credits, 0);
break;
}
nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc,
end, &index, &next, &done);
/* nothing to write? */
if (nr_pages == 0) {
kref_put(&wdata->refcount, cifs_writedata_release);
add_credits_and_wake_if(server, credits, 0);
continue;
}
wdata->credits = credits_on_stack;
wdata->cfile = cfile;
wdata->server = server;
cfile = NULL;
if (!wdata->cfile) {
cifs_dbg(VFS, "No writable handle in writepages rc=%d\n",
get_file_rc);
if (is_retryable_error(get_file_rc))
rc = get_file_rc;
else
rc = -EBADF;
} else
rc = wdata_send_pages(wdata, nr_pages, mapping, wbc);
for (i = 0; i < nr_pages; ++i)
unlock_page(wdata->pages[i]);
/* send failure -- clean up the mess */
if (rc != 0) {
add_credits_and_wake_if(server, &wdata->credits, 0);
for (i = 0; i < nr_pages; ++i) {
if (is_retryable_error(rc))
redirty_page_for_writepage(wbc,
wdata->pages[i]);
else
SetPageError(wdata->pages[i]);
end_page_writeback(wdata->pages[i]);
put_page(wdata->pages[i]);
}
if (!is_retryable_error(rc))
mapping_set_error(mapping, rc);
}
kref_put(&wdata->refcount, cifs_writedata_release);
if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) {
index = saved_index;
continue;
}
/* Return immediately if we received a signal during writing */
if (is_interrupt_error(rc)) {
done = true;
break;
}
if (rc != 0 && saved_rc == 0)
saved_rc = rc;
wbc->nr_to_write -= nr_pages;
if (wbc->nr_to_write <= 0)
done = true;
index = next;
}
if (!scanned && !done) {
/*
* We hit the last page and there is more work to be done: wrap
* back to the start of the file
*/
scanned = true;
index = 0;
goto retry;
}
if (saved_rc != 0)
rc = saved_rc;
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
mapping->writeback_index = index;
if (cfile)
cifsFileInfo_put(cfile);
free_xid(xid);
/* Indication to update ctime and mtime as close is deferred */
set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
return rc;
}
#endif
/*
* Extend the region to be written back to include subsequent contiguously
* dirty pages if possible, but don't sleep while doing so.
@ -3509,49 +3201,6 @@ int cifs_flush(struct file *file, fl_owner_t id)
return rc;
}
#if 0 // TODO: Remove for iov_iter support
static int
cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
{
int rc = 0;
unsigned long i;
for (i = 0; i < num_pages; i++) {
pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
if (!pages[i]) {
/*
* save number of pages we have already allocated and
* return with ENOMEM error
*/
num_pages = i;
rc = -ENOMEM;
break;
}
}
if (rc) {
for (i = 0; i < num_pages; i++)
put_page(pages[i]);
}
return rc;
}
static inline
size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
{
size_t num_pages;
size_t clen;
clen = min_t(const size_t, len, wsize);
num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
if (cur_len)
*cur_len = clen;
return num_pages;
}
#endif
static void
cifs_uncached_writedata_release(struct kref *refcount)
{
@ -3584,50 +3233,6 @@ cifs_uncached_writev_complete(struct work_struct *work)
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
}
#if 0 // TODO: Remove for iov_iter support
static int
wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from,
size_t *len, unsigned long *num_pages)
{
size_t save_len, copied, bytes, cur_len = *len;
unsigned long i, nr_pages = *num_pages;
save_len = cur_len;
for (i = 0; i < nr_pages; i++) {
bytes = min_t(const size_t, cur_len, PAGE_SIZE);
copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from);
cur_len -= copied;
/*
* If we didn't copy as much as we expected, then that
* may mean we trod into an unmapped area. Stop copying
* at that point. On the next pass through the big
* loop, we'll likely end up getting a zero-length
* write and bailing out of it.
*/
if (copied < bytes)
break;
}
cur_len = save_len - cur_len;
*len = cur_len;
/*
* If we have no data to send, then that probably means that
* the copy above failed altogether. That's most likely because
* the address in the iovec was bogus. Return -EFAULT and let
* the caller free anything we allocated and bail out.
*/
if (!cur_len)
return -EFAULT;
/*
* i + 1 now represents the number of pages we actually used in
* the copy phase above.
*/
*num_pages = i + 1;
return 0;
}
#endif
static int
cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
struct cifs_aio_ctx *ctx)
@ -4214,83 +3819,6 @@ cifs_uncached_readv_complete(struct work_struct *work)
kref_put(&rdata->refcount, cifs_readdata_release);
}
#if 0 // TODO: Remove for iov_iter support
static int
uncached_fill_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata, struct iov_iter *iter,
unsigned int len)
{
int result = 0;
unsigned int i;
unsigned int nr_pages = rdata->nr_pages;
unsigned int page_offset = rdata->page_offset;
rdata->got_bytes = 0;
rdata->tailsz = PAGE_SIZE;
for (i = 0; i < nr_pages; i++) {
struct page *page = rdata->pages[i];
size_t n;
unsigned int segment_size = rdata->pagesz;
if (i == 0)
segment_size -= page_offset;
else
page_offset = 0;
if (len <= 0) {
/* no need to hold page hostage */
rdata->pages[i] = NULL;
rdata->nr_pages--;
put_page(page);
continue;
}
n = len;
if (len >= segment_size)
/* enough data to fill the page */
n = segment_size;
else
rdata->tailsz = len;
len -= n;
if (iter)
result = copy_page_from_iter(
page, page_offset, n, iter);
#ifdef CONFIG_CIFS_SMB_DIRECT
else if (rdata->mr)
result = n;
#endif
else
result = cifs_read_page_from_socket(
server, page, page_offset, n);
if (result < 0)
break;
rdata->got_bytes += result;
}
return result != -ECONNABORTED && rdata->got_bytes > 0 ?
rdata->got_bytes : result;
}
static int
cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata, unsigned int len)
{
return uncached_fill_pages(server, rdata, NULL, len);
}
static int
cifs_uncached_copy_into_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
struct iov_iter *iter)
{
return uncached_fill_pages(server, rdata, iter, iter->count);
}
#endif
static int cifs_resend_rdata(struct cifs_readdata *rdata,
struct list_head *rdata_list,
struct cifs_aio_ctx *ctx)
@ -4900,140 +4428,6 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
return rc;
}
#if 0 // TODO: Remove for iov_iter support
static void
cifs_readv_complete(struct work_struct *work)
{
unsigned int i, got_bytes;
struct cifs_readdata *rdata = container_of(work,
struct cifs_readdata, work);
got_bytes = rdata->got_bytes;
for (i = 0; i < rdata->nr_pages; i++) {
struct page *page = rdata->pages[i];
if (rdata->result == 0 ||
(rdata->result == -EAGAIN && got_bytes)) {
flush_dcache_page(page);
SetPageUptodate(page);
} else
SetPageError(page);
if (rdata->result == 0 ||
(rdata->result == -EAGAIN && got_bytes))
cifs_readpage_to_fscache(rdata->mapping->host, page);
unlock_page(page);
got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes);
put_page(page);
rdata->pages[i] = NULL;
}
kref_put(&rdata->refcount, cifs_readdata_release);
}
static int
readpages_fill_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata, struct iov_iter *iter,
unsigned int len)
{
int result = 0;
unsigned int i;
u64 eof;
pgoff_t eof_index;
unsigned int nr_pages = rdata->nr_pages;
unsigned int page_offset = rdata->page_offset;
/* determine the eof that the server (probably) has */
eof = CIFS_I(rdata->mapping->host)->server_eof;
eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0;
cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index);
rdata->got_bytes = 0;
rdata->tailsz = PAGE_SIZE;
for (i = 0; i < nr_pages; i++) {
struct page *page = rdata->pages[i];
unsigned int to_read = rdata->pagesz;
size_t n;
if (i == 0)
to_read -= page_offset;
else
page_offset = 0;
n = to_read;
if (len >= to_read) {
len -= to_read;
} else if (len > 0) {
/* enough for partial page, fill and zero the rest */
zero_user(page, len + page_offset, to_read - len);
n = rdata->tailsz = len;
len = 0;
} else if (page->index > eof_index) {
/*
* The VFS will not try to do readahead past the
* i_size, but it's possible that we have outstanding
* writes with gaps in the middle and the i_size hasn't
* caught up yet. Populate those with zeroed out pages
* to prevent the VFS from repeatedly attempting to
* fill them until the writes are flushed.
*/
zero_user(page, 0, PAGE_SIZE);
flush_dcache_page(page);
SetPageUptodate(page);
unlock_page(page);
put_page(page);
rdata->pages[i] = NULL;
rdata->nr_pages--;
continue;
} else {
/* no need to hold page hostage */
unlock_page(page);
put_page(page);
rdata->pages[i] = NULL;
rdata->nr_pages--;
continue;
}
if (iter)
result = copy_page_from_iter(
page, page_offset, n, iter);
#ifdef CONFIG_CIFS_SMB_DIRECT
else if (rdata->mr)
result = n;
#endif
else
result = cifs_read_page_from_socket(
server, page, page_offset, n);
if (result < 0)
break;
rdata->got_bytes += result;
}
return result != -ECONNABORTED && rdata->got_bytes > 0 ?
rdata->got_bytes : result;
}
static int
cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata, unsigned int len)
{
return readpages_fill_pages(server, rdata, NULL, len);
}
static int
cifs_readpages_copy_into_pages(struct TCP_Server_Info *server,
struct cifs_readdata *rdata,
struct iov_iter *iter)
{
return readpages_fill_pages(server, rdata, iter, iter->count);
}
#endif
/*
* Unlock a bunch of folios in the pagecache.
*/