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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>
This commit is contained in:
Long Li 2018-05-30 12:47:58 -07:00 committed by Steve French
parent c06a0f2dff
commit 7b7f2bdf82
2 changed files with 20 additions and 0 deletions
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3
fs/cifs/cifsproto.h
View File

@ -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 */

17
fs/cifs/misc.c
View File

@ -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;
}