diff options
| author | Long Li <longli@microsoft.com> | 2018-05-30 12:47:58 -0700 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-06-05 17:41:00 -0500 |
| commit | 7b7f2bdf829ecf21845c0a571847ea18c6934970 (patch) | |
| tree | 216f146f9c716800d304ed0ac329fb2ad91977b0 /fs | |
| parent | c06a0f2dff704d9f734ff0d3d4812ccfc46ed8d0 (diff) | |
CIFS: Introduce helper function to get page offset and length in smb_rqst
Introduce a function rqst_page_get_length to return the page offset and
length for a given page in smb_rqst. This function is to be used by
following patches.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifs/cifsproto.h | 3 | ||||
| -rw-r--r-- | fs/cifs/misc.c | 17 |
2 files changed, 20 insertions, 0 deletions
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 7f0c773d5f6b..84765c8764bf 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -557,4 +557,7 @@ int cifs_alloc_hash(const char *name, struct crypto_shash **shash, struct sdesc **sdesc); void cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc); +extern void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, + unsigned int *len, unsigned int *offset); + #endif /* _CIFSPROTO_H */ diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index aba3fc3058da..f90d4ad6624c 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -905,3 +905,20 @@ cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) crypto_free_shash(*shash); *shash = NULL; } + +/** + * rqst_page_get_length - obtain the length and offset for a page in smb_rqst + * Input: rqst - a smb_rqst, page - a page index for rqst + * Output: *len - the length for this page, *offset - the offset for this page + */ +void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, + unsigned int *len, unsigned int *offset) +{ + *len = rqst->rq_pagesz; + *offset = (page == 0) ? rqst->rq_offset : 0; + + if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) + *len = rqst->rq_tailsz; + else if (page == 0) + *len = rqst->rq_pagesz - rqst->rq_offset; +} |