diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2012-12-05 15:08:29 +0400 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-12-06 01:01:44 +0400 |
| commit | 40ff2c3b3da35dd3a00ac6722056a59b4b3f2caf (patch) | |
| tree | ba5cb75ed6c6dd01b2191b35c470691e5347d35d | |
| parent | 0ff8754981261a80f4b77db2536dfea92c2d4539 (diff) | |
| download | linux-40ff2c3b3da35dd3a00ac6722056a59b4b3f2caf.tar.xz | |
target/file: Fix 32-bit highmem breakage for SGL -> iovec mapping
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>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -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 8f6dae074c2c..1fc5825b3912 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -236,7 +236,7 @@ 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(); @@ -244,6 +244,8 @@ 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 @@ -288,7 +290,7 @@ 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(); @@ -296,6 +298,9 @@ 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) { |