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Commit 71953fc6 authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: remove kmap lock and rsize limit 



Now that we aren't abusing the kmap address space, there's no need for
this lock or to impose a limit on the rsize.

Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
parent 5819575e

fs/cifs/cifsfs.c

+0 −4
Original line number Diff line number Diff line
@@ -88,10 +88,6 @@ extern mempool_t *cifs_mid_poolp; 


struct workqueue_struct	*cifsiod_wq;



#ifdef CONFIG_HIGHMEM

DEFINE_MUTEX(cifs_kmap_mutex);

#endif



static int

cifs_read_super(struct super_block *sb)

{

fs/cifs/cifsglob.h

+0 −39
Original line number Diff line number Diff line
@@ -637,45 +637,6 @@ get_next_mid(struct TCP_Server_Info *server) 
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)

#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)



/*

 * On hosts with high memory, we can't currently support wsize/rsize that are

 * larger than we can kmap at once. Cap the rsize/wsize at

 * LAST_PKMAP * PAGE_SIZE. We'll never be able to fill a read or write request

 * larger than that anyway.

 */

#ifdef CONFIG_HIGHMEM

#define CIFS_KMAP_SIZE_LIMIT   (LAST_PKMAP * PAGE_CACHE_SIZE)

#else /* CONFIG_HIGHMEM */

#define CIFS_KMAP_SIZE_LIMIT   (1<<24)

#endif /* CONFIG_HIGHMEM */



#ifdef CONFIG_HIGHMEM

/*

 * On arches that have high memory, kmap address space is limited. By

 * serializing the kmap operations on those arches, we ensure that we don't

 * end up with a bunch of threads in writeback with partially mapped page

 * arrays, stuck waiting for kmap to come back. That situation prevents

 * progress and can deadlock.

 */



extern struct mutex cifs_kmap_mutex;



static inline void

cifs_kmap_lock(void)

{

	mutex_lock(&cifs_kmap_mutex);

}



static inline void

cifs_kmap_unlock(void)

{

	mutex_unlock(&cifs_kmap_mutex);

}

#else /* !CONFIG_HIGHMEM */

#define cifs_kmap_lock() do { ; } while (0)

#define cifs_kmap_unlock() do { ; } while (0)

#endif /* CONFIG_HIGHMEM */



/*

 * Macros to allow the TCP_Server_Info->net field and related code to drop out

 * when CONFIG_NET_NS isn't set.

fs/cifs/smb1ops.c

+0 −3
Original line number Diff line number Diff line
@@ -483,9 +483,6 @@ cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) 
	if (!(server->capabilities & CAP_LARGE_READ_X))

		rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);



	/* limit to the amount that we can kmap at once */

	rsize = min_t(unsigned int, rsize, CIFS_KMAP_SIZE_LIMIT);



	/* hard limit of CIFS_MAX_RSIZE */

	rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);

fs/cifs/smb2ops.c

+0 −3
Original line number Diff line number Diff line
@@ -205,9 +205,6 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) 
	 */

	rsize = min_t(unsigned int, rsize, 2 << 15);



	/* limit to the amount that we can kmap at once */

	rsize = min_t(unsigned int, rsize, CIFS_KMAP_SIZE_LIMIT);



	return rsize;

}