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Commit 7b7f2bdf authored by Long Li's avatar Long Li Committed by Steve French
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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: default avatarLong Li <longli@microsoft.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent c06a0f2d

fs/cifs/cifsproto.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

fs/cifs/misc.c

+17 −0
Original line number Diff line number Diff line
@@ -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;

}