Miklos,
Your comments about vfs_tmpfile() were very valuable.
This patchset looks more neat than v1.
Patches 1 is the vfs_tmpfile() helper.
Patches 2-4 implement copy up of regular file with the helper.
Patch 5 is the waitqueue patch you sent me.
Patch 6 puts the pieces together for concurrent copy up.
Tested concurrent copy up with this simple test:
$ touch /lower/{empty,4g}
$ truncate -s 4g /lower/4g
$ touch /mnt/4g & # takes a while
$ touch /mnt/empty # exits immediately
$ touch /mnt/4g # blocks until %1 completes and can be interrupted
Tested vfs_tmpfile() with generic/004 and generic/389.
Tested with the new overlay/021 which exercises concurrent copy up
using 8 processes on 4 directories and 4K files.
v2:
- Move more code into vfs_tmpfile() helper
- Withdraw the workdir = upperdir hack
v1:
- Initial version
Amir Goldstein (6):
vfs: create vfs helper vfs_tmpfile()
ovl: check if upperdir fs supports O_TMPFILE
ovl: rearrange code in ovl_copy_up_locked()
ovl: copy up regular file using O_TMPFILE
ovl: introduce copy up waitqueue
ovl: concurrent copy up of regular files
fs/namei.c | 66 +++++++++++++++++++++++-------------
fs/overlayfs/copy_up.c | 88 +++++++++++++++++++++++++++++++++++-------------
fs/overlayfs/overlayfs.h | 11 ++++++
fs/overlayfs/ovl_entry.h | 3 ++
fs/overlayfs/super.c | 11 ++++++
fs/overlayfs/util.c | 30 +++++++++++++++++
include/linux/fs.h | 3 ++
7 files changed, 165 insertions(+), 47 deletions(-)
--
2.7.4
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