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Commit 33319141 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Add SMB2 support for cifs_iovec_write 



Signed-off-by: default avatarPavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent c9de5c80

fs/cifs/cifsfs.c

+4 −0
Original line number Diff line number Diff line
@@ -89,6 +89,10 @@ 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

+47 −0
Original line number Diff line number Diff line
@@ -582,6 +582,33 @@ get_next_mid(struct TCP_Server_Info *server) 
#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.
@@ -891,6 +918,26 @@ struct cifs_readdata { 
	struct kvec			iov[1];

};



struct cifs_writedata;



/* asynchronous write support */

struct cifs_writedata {

	struct kref			refcount;

	struct list_head		list;

	struct completion		done;

	enum writeback_sync_modes	sync_mode;

	struct work_struct		work;

	struct cifsFileInfo		*cfile;

	__u64				offset;

	pid_t				pid;

	unsigned int			bytes;

	int				result;

	void (*marshal_iov) (struct kvec *iov,

			     struct cifs_writedata *wdata);

	unsigned int			nr_pages;

	struct page			*pages[1];

};



/*

 * Take a reference on the file private data. Must be called with

 * cifs_file_list_lock held.

fs/cifs/cifsproto.h

+0 −18
Original line number Diff line number Diff line
@@ -468,24 +468,6 @@ void cifs_readdata_release(struct kref *refcount); 
int cifs_async_readv(struct cifs_readdata *rdata);

int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid);



/* asynchronous write support */

struct cifs_writedata {

	struct kref			refcount;

	struct list_head		list;

	struct completion		done;

	enum writeback_sync_modes	sync_mode;

	struct work_struct		work;

	struct cifsFileInfo		*cfile;

	__u64				offset;

	pid_t				pid;

	unsigned int			bytes;

	int				result;

	void (*marshal_iov) (struct kvec *iov,

			     struct cifs_writedata *wdata);

	unsigned int			nr_pages;

	struct page			*pages[1];

};



int cifs_async_writev(struct cifs_writedata *wdata);

void cifs_writev_complete(struct work_struct *work);

struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,

fs/cifs/cifssmb.c

+0 −26
Original line number Diff line number Diff line
@@ -86,32 +86,6 @@ static struct { 
#endif /* CONFIG_CIFS_WEAK_PW_HASH */

#endif /* CIFS_POSIX */



#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.

 */

static DEFINE_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 */



/*

 * Mark as invalid, all open files on tree connections since they

 * were closed when session to server was lost.

fs/cifs/smb2ops.c

+1 −0
Original line number Diff line number Diff line
@@ -434,6 +434,7 @@ struct smb_version_operations smb21_operations = { 
	.close = smb2_close_file,

	.flush = smb2_flush_file,

	.async_readv = smb2_async_readv,

	.async_writev = smb2_async_writev,

};



struct smb_version_values smb21_values = {