mirror_zfs/config/user-libaio.m4

dnl # SPDX-License-Identifier: CDDL-1.0
dnl #
dnl # Check for libaio - only used for mmap_libaio test cases.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBAIO], [
	ZFS_AC_FIND_SYSTEM_LIBRARY(LIBAIO, [], [libaio.h], [], [aio], [], [user_libaio=yes], [user_libaio=no])
])
build: add SPDX license tags to build system files Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #18077 2025-12-20 08:45:07 +03:00			`dnl # SPDX-License-Identifier: CDDL-1.0`
Fix mmap / libaio deadlock Calling uiomove() in mappedread() under the page lock can result in a deadlock if the user space page needs to be faulted in. Resolve the issue by dropping the page lock before the uiomove(). The inode range lock protects against concurrent updates via zfs_read() and zfs_write(). Reviewed-by: Albert Lee <trisk@forkgnu.org> Reviewed-by: Chunwei Chen <david.chen@nutanix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7335 Closes #7339 2018-03-28 20:19:22 +03:00			`dnl #`
config: user: check for <aio.h> And always zpool_read_label_slow() on non-conformant libcs Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Co-authored-by: José Luis Salvador Rufo <salvador.joseluis@gmail.com> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #13207 Closes #13254 2022-03-28 20:24:22 +03:00			`dnl # Check for libaio - only used for mmap_libaio test cases.`
Fix mmap / libaio deadlock Calling uiomove() in mappedread() under the page lock can result in a deadlock if the user space page needs to be faulted in. Resolve the issue by dropping the page lock before the uiomove(). The inode range lock protects against concurrent updates via zfs_read() and zfs_write(). Reviewed-by: Albert Lee <trisk@forkgnu.org> Reviewed-by: Chunwei Chen <david.chen@nutanix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7335 Closes #7339 2018-03-28 20:19:22 +03:00			`dnl #`
			`AC_DEFUN([ZFS_AC_CONFIG_USER_LIBAIO], [`
Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling Make FIND_SYSTEM_LIBRARY respect a configured sysroot, otherwise it might find headers from the build machine and assume the library is available on the host/target. Tighten up error checking: if pkg-config or the user specified _CFLAGS or _LIBS but we can't find the header/library, issue a fatal error. Fix the -L flag to /usr/local/lib instead of just /usr/local. Clean out the _CFLAGS and _LIBS if we located something that we later find doesn't work. Rename FIND_SYSTEM_LIBRARY into the ZFS_AC_ scope. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Closes #10538 2020-07-09 23:31:41 +03:00			`ZFS_AC_FIND_SYSTEM_LIBRARY(LIBAIO, [], [libaio.h], [], [aio], [], [user_libaio=yes], [user_libaio=no])`
Fix mmap / libaio deadlock Calling uiomove() in mappedread() under the page lock can result in a deadlock if the user space page needs to be faulted in. Resolve the issue by dropping the page lock before the uiomove(). The inode range lock protects against concurrent updates via zfs_read() and zfs_write(). Reviewed-by: Albert Lee <trisk@forkgnu.org> Reviewed-by: Chunwei Chen <david.chen@nutanix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7335 Closes #7339 2018-03-28 20:19:22 +03:00			`])`