ace1eae84c
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 <david.chen@osnexus.com>
24 lines
523 B
Plaintext
24 lines
523 B
Plaintext
dnl #
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dnl # 3.11 API change
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dnl # Add support for i_op->tmpfile
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_TMPFILE], [
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AC_MSG_CHECKING([whether i_op->tmpfile() exists])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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int tmpfile(struct inode *inode, struct dentry *dentry,
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umode_t mode) { return 0; }
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static struct inode_operations
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iops __attribute__ ((unused)) = {
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.tmpfile = tmpfile,
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};
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],[
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_TMPFILE, 1,
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[i_op->tmpfile() exists])
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],[
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AC_MSG_RESULT(no)
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])
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])
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