Add datacow mount option to enable copy-on-write with
remount option.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
changelog:
v2: Add datacow mount option.
---
Documentation/filesystems/btrfs.txt | 5 +++--
fs/btrfs/super.c | 8 +++++++-
2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt
index 6f2de1b..48c1833 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -159,9 +159,10 @@ Options with (*) are default options and will not show in the mount options.
(non-battery-backed) write-back cache, this option will lead to
filesystem corruption on a system crash or power loss.
+ datacow(*)
nodatacow
- Disable data copy-on-write for newly created files. Implies nodatasum,
- and disables all compression.
+ Enable/disable data copy-on-write for newly created files.
+ Nodatacow implies nodatasum, and disables all compression.
nodatasum
Disable data checksumming for newly created files.
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a5c25fd..cb4c90d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -325,7 +325,7 @@ enum {
Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nocheck_integrity,
Opt_nodiscard, Opt_noenospc_debug, Opt_noflushoncommit,
- Opt_noinode_cache, Opt_acl,
+ Opt_noinode_cache, Opt_acl, Opt_datacow,
Opt_err,
};
@@ -336,6 +336,7 @@ static match_table_t tokens = {
{Opt_device, "device=%s"},
{Opt_nodatasum, "nodatasum"},
{Opt_nodatacow, "nodatacow"},
+ {Opt_datacow, "datacow"},
{Opt_nobarrier, "nobarrier"},
{Opt_barrier, "barrier"},
{Opt_max_inline, "max_inline=%s"},
@@ -449,6 +450,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_set_opt(info->mount_opt, NODATACOW);
btrfs_set_opt(info->mount_opt, NODATASUM);
break;
+ case Opt_datacow:
+ if (btrfs_test_opt(root, NODATACOW))
+ btrfs_info(root->fs_info, "setting datacow");
+ btrfs_clear_opt(info->mount_opt, NODATACOW);
+ break;
case Opt_compress_force:
case Opt_compress_force_type:
compress_force = true;
--
1.8.5.2
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