Revision 8204f8ddaafafcae074746fcf2a05a45e6827603 authored by Darrick J. Wong on 10 August 2017, 21:20:28 UTC, committed by Darrick J. Wong on 17 August 2017, 19:40:33 UTC
Way back when we established inode block-map redo log items, it was
discovered that we needed to prevent the VFS from evicting inodes during
log recovery because any given inode might be have bmap redo items to
replay even if the inode has no link count and is ultimately deleted,
and any eviction of an unlinked inode causes the inode to be truncated
and freed too early.
To make this possible, we set MS_ACTIVE so that inodes would not be torn
down immediately upon release. Unfortunately, this also results in the
quota inodes not being released at all if a later part of the mount
process should fail, because we never reclaim the inodes. So, set
MS_ACTIVE right before we do the last part of log recovery and clear it
immediately after we finish the log recovery so that everything
will be torn down properly if we abort the mount.
Fixes: 17c12bcd30 ("xfs: when replaying bmap operations, don't let unlinked inodes get reaped")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
1 parent e28ae8e
headers_install.txt
Exporting kernel headers for use by userspace
=============================================
The "make headers_install" command exports the kernel's header files in a
form suitable for use by userspace programs.
The linux kernel's exported header files describe the API for user space
programs attempting to use kernel services. These kernel header files are
used by the system's C library (such as glibc or uClibc) to define available
system calls, as well as constants and structures to be used with these
system calls. The C library's header files include the kernel header files
from the "linux" subdirectory. The system's libc headers are usually
installed at the default location /usr/include and the kernel headers in
subdirectories under that (most notably /usr/include/linux and
/usr/include/asm).
Kernel headers are backwards compatible, but not forwards compatible. This
means that a program built against a C library using older kernel headers
should run on a newer kernel (although it may not have access to new
features), but a program built against newer kernel headers may not work on an
older kernel.
The "make headers_install" command can be run in the top level directory of the
kernel source code (or using a standard out-of-tree build). It takes two
optional arguments:
make headers_install ARCH=i386 INSTALL_HDR_PATH=/usr
ARCH indicates which architecture to produce headers for, and defaults to the
current architecture. The linux/asm directory of the exported kernel headers
is platform-specific, to see a complete list of supported architectures use
the command:
ls -d include/asm-* | sed 's/.*-//'
INSTALL_HDR_PATH indicates where to install the headers. It defaults to
"./usr".
An 'include' directory is automatically created inside INSTALL_HDR_PATH and
headers are installed in 'INSTALL_HDR_PATH/include'.
The command "make headers_install_all" exports headers for all architectures
simultaneously. (This is mostly of interest to distribution maintainers,
who create an architecture-independent tarball from the resulting include
directory.) You also can use HDR_ARCH_LIST to specify list of architectures.
Remember to provide the appropriate linux/asm directory via "mv" or "ln -s"
before building a C library with headers exported this way.
The kernel header export infrastructure is maintained by David Woodhouse
<dwmw2@infradead.org>.
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