diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2012-12-05 12:08:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:45:58 -0800 |
| commit | 84a4c28a7fd2b2e2f506bdcd060b8169584e0728 (patch) | |
| tree | 78c58bf6b04739f648bf3d431287e9078f07f003 /drivers/target | |
| parent | 39eca4f41e47835894743ab5d878f72a3981f397 (diff) | |
target/file: Fix 32-bit highmem breakage for SGL -> iovec mapping
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_file.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 0360383dfb9..c639b42b86c 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -260,7 +260,7 @@ 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(); @@ -268,6 +268,8 @@ 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 @@ -313,7 +315,7 @@ 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(); @@ -321,6 +323,9 @@ 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) { |