| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 50/69] target/file: Do not return error for UNMAP if length is zero | Date | Mon, 18 Dec 2017 16:48:36 +0100 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Jiang Yi <jiangyilism@gmail.com>
[ Upstream commit 594e25e73440863981032d76c9b1e33409ceff6e ]
The function fd_execute_unmap() in target_core_file.c calles
ret = file->f_op->fallocate(file, mode, pos, len);
Some filesystems implement fallocate() to return error if length is zero (e.g. btrfs) but according to SCSI Block Commands spec UNMAP should return success for zero length.
Signed-off-by: Jiang Yi <jiangyilism@gmail.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/target/target_core_file.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -592,6 +592,10 @@ fd_do_unmap(struct se_cmd *cmd, void *pr struct inode *inode = file->f_mapping->host; int ret; + if (!nolb) { + return 0; + } + if (cmd->se_dev->dev_attrib.pi_prot_type) { ret = fd_do_prot_unmap(cmd, lba, nolb); if (ret)
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