diff options
| author | Long Li <longli@microsoft.com> | 2018-05-30 12:47:54 -0700 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2018-06-02 18:36:26 -0500 |
| commit | f9f5aca115fd4a4b49cdc483084a0dc4ca316b25 (patch) | |
| tree | d4d7969a9c3b7f92644c316fa6dd683d905dbe5a /fs/cifs | |
| parent | 8ce79ec359ad9f9d94aabf16c1ea5b8f28481c0f (diff) | |
| download | blackbird-obmc-linux-f9f5aca115fd4a4b49cdc483084a0dc4ca316b25.tar.gz blackbird-obmc-linux-f9f5aca115fd4a4b49cdc483084a0dc4ca316b25.zip | |
CIFS: Add support for direct pages in rdata
Add a function to allocate rdata without allocating pages for data
transfer. This gives the caller an option to pass a number of pages
that point to the data buffer.
rdata is still reponsible for free those pages after it's done.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/cifsglob.h | 2 | ||||
| -rw-r--r-- | fs/cifs/file.c | 23 |
2 files changed, 21 insertions, 4 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 5105ac5f90f5..781c2af609e5 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1185,7 +1185,7 @@ struct cifs_readdata { unsigned int tailsz; unsigned int credits; unsigned int nr_pages; - struct page *pages[]; + struct page **pages; }; struct cifs_writedata; diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 23fd430fe74a..1c98293c1829 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2880,13 +2880,13 @@ out: } static struct cifs_readdata * -cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) +cifs_readdata_direct_alloc(struct page **pages, work_func_t complete) { struct cifs_readdata *rdata; - rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), - GFP_KERNEL); + rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); if (rdata != NULL) { + rdata->pages = pages; kref_init(&rdata->refcount); INIT_LIST_HEAD(&rdata->list); init_completion(&rdata->done); @@ -2896,6 +2896,22 @@ cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) return rdata; } +static struct cifs_readdata * +cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) +{ + struct page **pages = + kzalloc(sizeof(struct page *) * nr_pages, GFP_KERNEL); + struct cifs_readdata *ret = NULL; + + if (pages) { + ret = cifs_readdata_direct_alloc(pages, complete); + if (!ret) + kfree(pages); + } + + return ret; +} + void cifs_readdata_release(struct kref *refcount) { @@ -2910,6 +2926,7 @@ cifs_readdata_release(struct kref *refcount) if (rdata->cfile) cifsFileInfo_put(rdata->cfile); + kvfree(rdata->pages); kfree(rdata); } |
