diff options
| author | Paulo Alcantara <pc@cjr.nz> | 2022-12-05 23:31:53 -0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-12-08 09:51:53 -0600 |
| commit | d406d26745aba3365ab9171b2d5cbea9c1757305 (patch) | |
| tree | 83500b44a6ab13755303fea484c69c47a7a34e88 /fs/cifs/smb2ops.c | |
| parent | ebaad77c89921c8237ca17791d5462bd289052d0 (diff) | |
| download | linux-d406d26745aba3365ab9171b2d5cbea9c1757305.tar.bz2 | |
cifs: skip alloc when request has no pages
When smb3_init_transform_rq() was being called with requests (@old_rq)
which had no pages, it was unnecessarily allocating a single page for
every request in @new_rq.
Fix this by skipping page array allocation when requests have no pages
(e.g. !smb_rqst::rq_npages).
Also get rid of deprecated kmap() and use kmap_local_page() instead
while we're at it.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2ops.c')
| -rw-r--r-- | fs/cifs/smb2ops.c | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index bfaafd02fb1f..72b22d033ed5 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -4445,21 +4445,27 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst, int rc = -ENOMEM; for (i = 1; i < num_rqst; i++) { - npages = old_rq[i - 1].rq_npages; + struct smb_rqst *old = &old_rq[i - 1]; + struct smb_rqst *new = &new_rq[i]; + + orig_len += smb_rqst_len(server, old); + new->rq_iov = old->rq_iov; + new->rq_nvec = old->rq_nvec; + + npages = old->rq_npages; + if (!npages) + continue; + pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); if (!pages) goto err_free; - new_rq[i].rq_pages = pages; - new_rq[i].rq_npages = npages; - new_rq[i].rq_offset = old_rq[i - 1].rq_offset; - new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz; - new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz; - new_rq[i].rq_iov = old_rq[i - 1].rq_iov; - new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec; - - orig_len += smb_rqst_len(server, &old_rq[i - 1]); + new->rq_pages = pages; + new->rq_npages = npages; + new->rq_offset = old->rq_offset; + new->rq_pagesz = old->rq_pagesz; + new->rq_tailsz = old->rq_tailsz; for (j = 0; j < npages; j++) { pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); @@ -4472,14 +4478,14 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst, char *dst, *src; unsigned int offset, len; - rqst_page_get_length(&new_rq[i], j, &len, &offset); + rqst_page_get_length(new, j, &len, &offset); - dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset; - src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset; + dst = kmap_local_page(new->rq_pages[j]) + offset; + src = kmap_local_page(old->rq_pages[j]) + offset; memcpy(dst, src, len); - kunmap(new_rq[i].rq_pages[j]); - kunmap(old_rq[i - 1].rq_pages[j]); + kunmap(new->rq_pages[j]); + kunmap(old->rq_pages[j]); } } |