From: Darrick J. Wong <djwong@xxxxxxxxxx>
Port the xfile functionality (anonymous pageable file-index memory) from
the kernel. In userspace, we try to use memfd() to create tmpfs files
that are not in any namespace, matching the kernel.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
libxfs/Makefile | 2
libxfs/xfile.c | 210 +++++++++++++++++++++++++++++++++++++++++++++++++++
libxfs/xfile.h | 21 +++++
repair/xfs_repair.c | 15 ++++
4 files changed, 248 insertions(+)
create mode 100644 libxfs/xfile.c
create mode 100644 libxfs/xfile.h
diff --git a/libxfs/Makefile b/libxfs/Makefile
index 6f688c0ad..43e8ae183 100644
--- a/libxfs/Makefile
+++ b/libxfs/Makefile
@@ -26,6 +26,7 @@ HFILES = \
libxfs_priv.h \
linux-err.h \
topology.h \
+ xfile.h \
xfs_ag_resv.h \
xfs_alloc.h \
xfs_alloc_btree.h \
@@ -66,6 +67,7 @@ CFILES = cache.c \
topology.c \
trans.c \
util.c \
+ xfile.c \
xfs_ag.c \
xfs_ag_resv.c \
xfs_alloc.c \
diff --git a/libxfs/xfile.c b/libxfs/xfile.c
new file mode 100644
index 000000000..cba173cc1
--- /dev/null
+++ b/libxfs/xfile.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#include "libxfs_priv.h"
+#include "libxfs.h"
+#include "libxfs/xfile.h"
+#include <linux/memfd.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+/*
+ * Swappable Temporary Memory
+ * ==========================
+ *
+ * Offline checking sometimes needs to be able to stage a large amount of data
+ * in memory. This information might not fit in the available memory and it
+ * doesn't all need to be accessible at all times. In other words, we want an
+ * indexed data buffer to store data that can be paged out.
+ *
+ * memfd files meet those requirements. Therefore, the xfile mechanism uses
+ * one to store our staging data. The xfile must be freed with xfile_destroy.
+ *
+ * xfiles assume that the caller will handle all required concurrency
+ * management; file locks are not taken.
+ */
+
+/*
+ * Starting with Linux 6.3, there's a new MFD_NOEXEC_SEAL flag that disables
+ * the longstanding memfd behavior that files are created with the executable
+ * bit set, and seals the file against it being turned back on.
+ */
+#ifndef MFD_NOEXEC_SEAL
+# define MFD_NOEXEC_SEAL (0x0008U)
+#endif
+
+/*
+ * Open a memory-backed fd to back an xfile. We require close-on-exec here,
+ * because these memfd files function as windowed RAM and hence should never
+ * be shared with other processes.
+ */
+static int
+xfile_create_fd(
+ const char *description)
+{
+ int fd = -1;
+ int ret;
+
+ /*
+ * memfd_create was added to kernel 3.17 (2014). MFD_NOEXEC_SEAL
+ * causes -EINVAL on old kernels, so fall back to omitting it so that
+ * new xfs_repair can run on an older recovery cd kernel.
+ */
+ fd = memfd_create(description, MFD_CLOEXEC | MFD_NOEXEC_SEAL);
+ if (fd >= 0)
+ goto got_fd;
+ fd = memfd_create(description, MFD_CLOEXEC);
+ if (fd >= 0)
+ goto got_fd;
+
+ /*
+ * O_TMPFILE exists as of kernel 3.11 (2013), which means that if we
+ * find it, we're pretty safe in assuming O_CLOEXEC exists too.
+ */
+ fd = open("/dev/shm", O_TMPFILE | O_CLOEXEC | O_RDWR, 0600);
+ if (fd >= 0)
+ goto got_fd;
+
+ fd = open("/tmp", O_TMPFILE | O_CLOEXEC | O_RDWR, 0600);
+ if (fd >= 0)
+ goto got_fd;
+
+ /*
+ * mkostemp exists as of glibc 2.7 (2007) and O_CLOEXEC exists as of
+ * kernel 2.6.23 (2007).
+ */
+ fd = mkostemp("libxfsXXXXXX", O_CLOEXEC);
+ if (fd >= 0)
+ goto got_fd;
+
+ if (!errno)
+ errno = EOPNOTSUPP;
+ return -1;
+got_fd:
+ /*
+ * Turn off mode bits we don't want -- group members and others should
+ * not have access to the xfile, nor it be executable. memfds are
+ * created with mode 0777, but we'll be careful just in case the other
+ * implementations fail to set 0600.
+ */
+ ret = fchmod(fd, 0600);
+ if (ret)
+ perror("disabling xfile executable bit");
+
+ return fd;
+}
+
+/*
+ * Create an xfile of the given size. The description will be used in the
+ * trace output.
+ */
+int
+xfile_create(
+ const char *description,
+ struct xfile **xfilep)
+{
+ struct xfile *xf;
+ int error;
+
+ xf = kmalloc(sizeof(struct xfile), 0);
+ if (!xf)
+ return -ENOMEM;
+
+ xf->fd = xfile_create_fd(description);
+ if (xf->fd < 0) {
+ error = -errno;
+ kfree(xf);
+ return error;
+ }
+
+ *xfilep = xf;
+ return 0;
+}
+
+/* Close the file and release all resources. */
+void
+xfile_destroy(
+ struct xfile *xf)
+{
+ close(xf->fd);
+ kfree(xf);
+}
+
+static inline loff_t
+xfile_maxbytes(
+ struct xfile *xf)
+{
+ if (sizeof(loff_t) == 8)
+ return LLONG_MAX;
+ return LONG_MAX;
+}
+
+/*
+ * Load an object. Since we're treating this file as "memory", any error or
+ * short IO is treated as a failure to allocate memory.
+ */
+ssize_t
+xfile_load(
+ struct xfile *xf,
+ void *buf,
+ size_t count,
+ loff_t pos)
+{
+ ssize_t ret;
+
+ if (count > INT_MAX)
+ return -ENOMEM;
+ if (xfile_maxbytes(xf) - pos < count)
+ return -ENOMEM;
+
+ ret = pread(xf->fd, buf, count, pos);
+ if (ret < 0)
+ return -errno;
+ if (ret != count)
+ return -ENOMEM;
+ return 0;
+}
+
+/*
+ * Store an object. Since we're treating this file as "memory", any error or
+ * short IO is treated as a failure to allocate memory.
+ */
+ssize_t
+xfile_store(
+ struct xfile *xf,
+ const void *buf,
+ size_t count,
+ loff_t pos)
+{
+ ssize_t ret;
+
+ if (count > INT_MAX)
+ return -E2BIG;
+ if (xfile_maxbytes(xf) - pos < count)
+ return -EFBIG;
+
+ ret = pwrite(xf->fd, buf, count, pos);
+ if (ret < 0)
+ return -errno;
+ if (ret != count)
+ return -ENOMEM;
+ return 0;
+}
+
+/* Compute the number of bytes used by a xfile. */
+unsigned long long
+xfile_bytes(
+ struct xfile *xf)
+{
+ struct stat statbuf;
+ int error;
+
+ error = fstat(xf->fd, &statbuf);
+ if (error)
+ return -errno;
+
+ return (unsigned long long)statbuf.st_blocks << 9;
+}
diff --git a/libxfs/xfile.h b/libxfs/xfile.h
new file mode 100644
index 000000000..d60084011
--- /dev/null
+++ b/libxfs/xfile.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#ifndef __LIBXFS_XFILE_H__
+#define __LIBXFS_XFILE_H__
+
+struct xfile {
+ int fd;
+};
+
+int xfile_create(const char *description, struct xfile **xfilep);
+void xfile_destroy(struct xfile *xf);
+
+ssize_t xfile_load(struct xfile *xf, void *buf, size_t count, loff_t pos);
+ssize_t xfile_store(struct xfile *xf, const void *buf, size_t count, loff_t pos);
+
+unsigned long long xfile_bytes(struct xfile *xf);
+
+#endif /* __LIBXFS_XFILE_H__ */
diff --git a/repair/xfs_repair.c b/repair/xfs_repair.c
index ae3d2fcb0..bf56daa93 100644
--- a/repair/xfs_repair.c
+++ b/repair/xfs_repair.c
@@ -991,6 +991,20 @@ phase_end(
platform_crash();
}
+/* Try to allow as many memfds as possible. */
+static void
+bump_max_fds(void)
+{
+ struct rlimit rlim = { };
+ int ret;
+
+ ret = getrlimit(RLIMIT_NOFILE, &rlim);
+ if (!ret) {
+ rlim.rlim_cur = rlim.rlim_max;
+ setrlimit(RLIMIT_NOFILE, &rlim);
+ }
+}
+
int
main(int argc, char **argv)
{
@@ -1010,6 +1024,7 @@ main(int argc, char **argv)
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
dinode_bmbt_translation_init();
+ bump_max_fds();
temp_mp = &xfs_m;
setbuf(stdout, NULL);
