802e7b5feb
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 <rlaager@wiktel.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1384
24 lines
646 B
Plaintext
24 lines
646 B
Plaintext
dnl #
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dnl # 3.11 API change
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dnl # lseek_execute helper exported
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_LSEEK_EXECUTE],
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[AC_MSG_CHECKING([whether lseek_execute() is available])
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ZFS_LINUX_TRY_COMPILE_SYMBOL([
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#include <linux/fs.h>
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], [
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struct file *fp __attribute__ ((unused)) = NULL;
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struct inode *ip __attribute__ ((unused)) = NULL;
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loff_t offset __attribute__ ((unused)) = 0;
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loff_t maxsize __attribute__ ((unused)) = 0;
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lseek_execute(fp, ip, offset, maxsize);
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], [lseek_exclusive], [fs/read_write.c], [
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_LSEEK_EXECUTE, 1,
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[lseek_execute() is available])
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], [
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AC_MSG_RESULT(no)
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])
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])
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