From abfa034e4b8ed0046fa589769e9840af645bc4ba Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 16 Aug 2011 10:50:10 +0530 Subject: fs/9p: Update zero-copy implementation in 9p * remove lot of update to different data structure * add a seperate callback for zero copy request. * above makes non zero copy code path simpler * remove conditionalizing TREAD/TREADDIR/TWRITE in the zero copy path * Fix the dotu p9_check_errors with zero copy. Add sufficient doc around * Add support for both in and output buffers in zero copy callback * pin and unpin pages in the same context * use helpers instead of defining page offset and rest of page ourself * Fix mem leak in p9_check_errors * Remove 'E' and 'F' in p9pdu_vwritef Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen --- net/9p/protocol.c | 46 +--------------------------------------------- 1 file changed, 1 insertion(+), 45 deletions(-) (limited to 'net/9p/protocol.c') diff --git a/net/9p/protocol.c b/net/9p/protocol.c index df58375ea6b3..b7d4e8aa5383 100644 --- a/net/9p/protocol.c +++ b/net/9p/protocol.c @@ -81,7 +81,7 @@ void p9stat_free(struct p9_wstat *stbuf) } EXPORT_SYMBOL(p9stat_free); -static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) +size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) { size_t len = min(pdu->size - pdu->offset, size); memcpy(data, &pdu->sdata[pdu->offset], len); @@ -108,26 +108,6 @@ pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size) return size - len; } -static size_t -pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata, - size_t size) -{ - BUG_ON(pdu->size > P9_IOHDRSZ); - pdu->pubuf = (char __user *)udata; - pdu->pkbuf = (char *)kdata; - pdu->pbuf_size = size; - return 0; -} - -static size_t -pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size) -{ - BUG_ON(pdu->size > P9_READDIRHDRSZ); - pdu->pkbuf = (char *)kdata; - pdu->pbuf_size = size; - return 0; -} - /* b - int8_t w - int16_t @@ -459,26 +439,6 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, errcode = -EFAULT; } break; - case 'E':{ - int32_t cnt = va_arg(ap, int32_t); - const char *k = va_arg(ap, const void *); - const char __user *u = va_arg(ap, - const void __user *); - errcode = p9pdu_writef(pdu, proto_version, "d", - cnt); - if (!errcode && pdu_write_urw(pdu, k, u, cnt)) - errcode = -EFAULT; - } - break; - case 'F':{ - int32_t cnt = va_arg(ap, int32_t); - const char *k = va_arg(ap, const void *); - errcode = p9pdu_writef(pdu, proto_version, "d", - cnt); - if (!errcode && pdu_write_readdir(pdu, k, cnt)) - errcode = -EFAULT; - } - break; case 'U':{ int32_t count = va_arg(ap, int32_t); const char __user *udata = @@ -637,10 +597,6 @@ void p9pdu_reset(struct p9_fcall *pdu) { pdu->offset = 0; pdu->size = 0; - pdu->private = NULL; - pdu->pubuf = NULL; - pdu->pkbuf = NULL; - pdu->pbuf_size = 0; } int p9dirent_read(char *buf, int len, struct p9_dirent *dirent, -- cgit v1.2.3