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9baaa7deae
Register iterate_shared if it exists so the kernel will used shared lock and allowing concurrent readdir. Also, use shared lock when doing llseek with SEEK_DATA or SEEK_HOLE to allow concurrent seeking. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4664 Closes #4665
65 lines
1.5 KiB
Plaintext
65 lines
1.5 KiB
Plaintext
AC_DEFUN([ZFS_AC_KERNEL_VFS_ITERATE], [
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dnl #
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dnl # 4.7 API change
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dnl #
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AC_MSG_CHECKING([whether fops->iterate_shared() is available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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int iterate(struct file *filp, struct dir_context * context)
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{ return 0; }
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static const struct file_operations fops
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__attribute__ ((unused)) = {
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.iterate_shared = iterate,
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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_VFS_ITERATE_SHARED, 1,
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[fops->iterate_shared() is available])
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],[
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AC_MSG_RESULT(no)
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dnl #
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dnl # 3.11 API change
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dnl #
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AC_MSG_CHECKING([whether fops->iterate() is available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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int iterate(struct file *filp, struct dir_context * context)
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{ return 0; }
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static const struct file_operations fops
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__attribute__ ((unused)) = {
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.iterate = iterate,
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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_VFS_ITERATE, 1,
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[fops->iterate() is available])
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],[
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AC_MSG_RESULT(no)
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AC_MSG_CHECKING([whether fops->readdir() is available])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/fs.h>
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int readdir(struct file *filp, void *entry, filldir_t func)
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{ return 0; }
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static const struct file_operations fops
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__attribute__ ((unused)) = {
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.readdir = readdir,
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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_VFS_READDIR, 1,
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[fops->readdir() is available])
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],[
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AC_MSG_ERROR(no; file a bug report with ZFSOnLinux)
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])
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])
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])
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])
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