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Subject[PATCH 081/222] target/file: Fix 32-bit highmem breakage for SGL -> iovec mapping
Date
3.5.7.3 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

commit 40ff2c3b3da35dd3a00ac6722056a59b4b3f2caf upstream.

This patch changes vectored file I/O to use kmap + kunmap when mapping
incoming SGL memory -> struct iovec in order to properly support 32-bit
highmem configurations. This is because an extra bounce buffer may be
required when processing scatterlist pages allocated with GFP_KERNEL.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
drivers/target/target_core_file.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index c0d6e6d..d2414e9 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -279,7 +279,7 @@ static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,

for_each_sg(sgl, sg, sgl_nents, i) {
iov[i].iov_len = sg->length;
- iov[i].iov_base = sg_virt(sg);
+ iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
}

old_fs = get_fs();
@@ -287,6 +287,8 @@ static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl,
ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
set_fs(old_fs);

+ for_each_sg(sgl, sg, sgl_nents, i)
+ kunmap(sg_page(sg));
kfree(iov);
/*
* Return zeros and GOOD status even if the READ did not return
@@ -332,7 +334,7 @@ static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl,

for_each_sg(sgl, sg, sgl_nents, i) {
iov[i].iov_len = sg->length;
- iov[i].iov_base = sg_virt(sg);
+ iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
}

old_fs = get_fs();
@@ -340,6 +342,9 @@ static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl,
ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
set_fs(old_fs);

+ for_each_sg(sgl, sg, sgl_nents, i)
+ kunmap(sg_page(sg));
+
kfree(iov);

if (ret < 0 || ret != cmd->data_length) {
--
1.7.9.5


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