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target/file: Do not return error for UNMAP if length is zero

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[ Upstream commit 594e25e734 ]

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>
This commit is contained in:
Jiang Yi 2017-08-11 11:29:44 +08:00 committed by Greg Kroah-Hartman
parent 998201fdc5
commit dcdca12381
1 changed files with 4 additions and 0 deletions
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4
drivers/target/target_core_file.c
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@ -466,6 +466,10 @@ fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
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)