The following three patches allow fs to "cachefiles" in a BTRFS
filesystem.
The first is a minor cleanup to cachefiles.
The second is the main change - it teaches cachefile to use
lseek(SEEK_DATA) to find allocated blocks in a file, rather than bmap.
The third patch simply enables this for btrfs.
Thanks,
NeilBrown
---
NeilBrown (3):
cachefiles: perform test on s_blocksize when opening cache file.
fscache/cachefiles: optionally use SEEK_DATA instead of ->bmap.
btrfs: set FS_SUPPORTS_SEEK_HOLE flag.
fs/btrfs/super.c | 3 +
fs/cachefiles/namei.c | 13 ++++-
fs/cachefiles/rdwr.c | 125 ++++++++++++++++++++++++++++++-------------------
include/linux/fs.h | 1
4 files changed, 88 insertions(+), 54 deletions(-)
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