[PATCH 2/4] btrfs: introduce new compression property to disable compression at all

[Satoru Takeuchi]

From: Naohiro Aota <na...@elisp.net>

This new compression property, "off", to disable compression of
the file at all.

Signed-off-by: Naohiro Aota <na...@elisp.net>
Signed-off-by: Satoru Takeuchi <takeuchi_sat...@jp.fujitsu.com>
---
 fs/btrfs/props.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index bf005f4..38efbe1 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -382,6 +382,8 @@ static int prop_compression_validate(const char *value, 
size_t len)
                return 0;
        else if (!strncmp("zlib", value, len))
                return 0;
+       else if (!strncmp("off", value, len))
+               return 0;
 
        return -EINVAL;
 }
@@ -400,6 +402,14 @@ static int prop_compression_apply(struct inode *inode,
                return 0;
        }
 
+       if (!strncmp("off", value, len)) {
+               BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
+               BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
+               BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
+
+               return 0;
+       }
+
        if (!strncmp("lzo", value, len))
                type = BTRFS_COMPRESS_LZO;
        else if (!strncmp("zlib", value, len))
@@ -423,5 +433,8 @@ static const char *prop_compression_extract(struct inode 
*inode)
                return "lzo";
        }
 
+       if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
+               return "off";
+
        return NULL;
 }
-- 1.8.3.1 

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