From: Jiang Yi jiangyilism@gmail.com
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ 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@microsoft.com --- drivers/target/target_core_file.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index dee7dfdf203a..5d5e5cd77261 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -539,6 +539,10 @@ fd_do_unmap(struct se_cmd *cmd, void *priv, 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)