diff options
| author | Chunwei Chen <[email protected]> | 2016-01-26 12:29:46 -0800 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2016-11-04 10:46:40 -0700 |
| commit | ace1eae84cca8579596f46262d99df19f6d7e963 (patch) | |
| tree | 22e2bf44dfc906cf6cb75567d993a86f64bf1ef8 /config | |
| parent | 987014903f9d36783547188b6ad00f01d9a076bd (diff) | |
Add support for O_TMPFILE
Linux 3.11 add O_TMPFILE to open(2), which allow creating an unlinked file on
supported filesystem. It's basically doing open(2) and unlink(2) atomically.
The filesystem support is added through i_op->tmpfile. We basically copy the
create operation except we get rid of the link and name related stuff and add
the new node to unlinked set.
We also add support for linkat(2) to link tmpfile. However, since all previous
file operation will skip ZIL, we force a txg_wait_synced to make sure we are
sync safe.
Signed-off-by: Chunwei Chen <[email protected]>
Diffstat (limited to 'config')
| -rw-r--r-- | config/kernel-tmpfile.m4 | 23 | ||||
| -rw-r--r-- | config/kernel.m4 | 1 |
2 files changed, 24 insertions, 0 deletions
diff --git a/config/kernel-tmpfile.m4 b/config/kernel-tmpfile.m4 new file mode 100644 index 000000000..5aad90450 --- /dev/null +++ b/config/kernel-tmpfile.m4 @@ -0,0 +1,23 @@ +dnl # +dnl # 3.11 API change +dnl # Add support for i_op->tmpfile +dnl # +AC_DEFUN([ZFS_AC_KERNEL_TMPFILE], [ + AC_MSG_CHECKING([whether i_op->tmpfile() exists]) + ZFS_LINUX_TRY_COMPILE([ + #include <linux/fs.h> + int tmpfile(struct inode *inode, struct dentry *dentry, + umode_t mode) { return 0; } + static struct inode_operations + iops __attribute__ ((unused)) = { + .tmpfile = tmpfile, + }; + ],[ + ],[ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_TMPFILE, 1, + [i_op->tmpfile() exists]) + ],[ + AC_MSG_RESULT(no) + ]) +]) diff --git a/config/kernel.m4 b/config/kernel.m4 index 44a20f213..15e2ef351 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -69,6 +69,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [ ZFS_AC_KERNEL_CREATE_NAMEIDATA ZFS_AC_KERNEL_GET_LINK ZFS_AC_KERNEL_PUT_LINK + ZFS_AC_KERNEL_TMPFILE ZFS_AC_KERNEL_TRUNCATE_RANGE ZFS_AC_KERNEL_AUTOMOUNT ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE |