diff options
| author | Li Dongyang <[email protected]> | 2013-06-13 13:51:09 -0400 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2013-07-02 09:24:43 -0700 |
| commit | 802e7b5feb0135483de119eac1da192404eb5bb7 (patch) | |
| tree | 79e9810d340a3fdc66aa5c557bad3cddb7b72efc /config/kernel-lseek-execute.m4 | |
| parent | cf91b2b6b2baaca1e56f23c985e3261cd98bd3f0 (diff) | |
Add SEEK_DATA/SEEK_HOLE to lseek()/llseek()
The approach taken was the rework zfs_holey() as little as
possible and then just wrap the code as needed to ensure
correct locking and error handling.
Tested with xfstests 285 and 286. All tests pass except for
7-9 of 285 which try to reserve blocks first via fallocate(2)
and fail because fallocate(2) is not yet supported.
Note that the filp->f_lock spinlock did not exist prior to
Linux 2.6.30, but we avoid the need for autotools check by
virtue of the fact that SEEK_DATA/SEEK_HOLE support was not
added until Linux 3.1.
An autoconf check was added for lseek_execute() which is
currently a private function but the expectation is that it
will be exported perhaps as early as Linux 3.11.
Reviewed-by: Richard Laager <[email protected]>
Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #1384
Diffstat (limited to 'config/kernel-lseek-execute.m4')
| -rw-r--r-- | config/kernel-lseek-execute.m4 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/config/kernel-lseek-execute.m4 b/config/kernel-lseek-execute.m4 new file mode 100644 index 000000000..8c4032b92 --- /dev/null +++ b/config/kernel-lseek-execute.m4 @@ -0,0 +1,23 @@ +dnl # +dnl # 3.11 API change +dnl # lseek_execute helper exported +dnl # +AC_DEFUN([ZFS_AC_KERNEL_LSEEK_EXECUTE], + [AC_MSG_CHECKING([whether lseek_execute() is available]) + ZFS_LINUX_TRY_COMPILE_SYMBOL([ + #include <linux/fs.h> + ], [ + struct file *fp __attribute__ ((unused)) = NULL; + struct inode *ip __attribute__ ((unused)) = NULL; + loff_t offset __attribute__ ((unused)) = 0; + loff_t maxsize __attribute__ ((unused)) = 0; + + lseek_execute(fp, ip, offset, maxsize); + ], [lseek_exclusive], [fs/read_write.c], [ + AC_MSG_RESULT(yes) + AC_DEFINE(HAVE_LSEEK_EXECUTE, 1, + [lseek_execute() is available]) + ], [ + AC_MSG_RESULT(no) + ]) +]) |