From: John Groves <John@Groves.net>
To: John Groves <jgroves@micron.com>,
Jonathan Corbet <corbet@lwn.net>,
Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
nvdimm@lists.linux.dev
Cc: John@Groves.net, john@jagalactic.com,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@infradead.org>,
dave.hansen@linux.intel.com, gregory.price@memverge.com,
John Groves <john@groves.net>
Subject: [RFC PATCH 15/20] famfs: Add ioctl to file_operations
Date: Fri, 23 Feb 2024 11:41:59 -0600 [thread overview]
Message-ID: <a5d0969403ca02af6593b6789a21b230b2436800.1708709155.git.john@groves.net> (raw)
In-Reply-To: <cover.1708709155.git.john@groves.net>
This commit introduces the per-file ioctl function famfs_file_ioctl()
into struct file_operations, and introduces the famfs_file_init_dax()
function (which is called by famfs_file_ioct())
famfs_file_init_dax() associates a dax extent list with a file, making
it into a proper famfs file. It is called from the FAMFSIOC_MAP_CREATE
ioctl. Starting with an empty file (which is basically a ramfs file),
this turns the file into a DAX file backed by the specified extent list.
The other ioctls are:
FAMFSIOC_NOP - A convenient way for user space to verify it's a famfs file
FAMFSIOC_MAP_GET - Get the header of the metadata for a file
FAMFSIOC_MAP_GETEXT - Get the extents for a file
The latter two, together, are comparable to xfs_bmap. Our user space tools
use them primarly in testing.
Signed-off-by: John Groves <john@groves.net>
---
fs/famfs/famfs_file.c | 226 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 226 insertions(+)
diff --git a/fs/famfs/famfs_file.c b/fs/famfs/famfs_file.c
index 5228e9de1e3b..fd42d5966982 100644
--- a/fs/famfs/famfs_file.c
+++ b/fs/famfs/famfs_file.c
@@ -19,6 +19,231 @@
#include <uapi/linux/famfs_ioctl.h>
#include "famfs_internal.h"
+/**
+ * famfs_map_meta_alloc() - Allocate famfs file metadata
+ * @mapp: Pointer to an mcache_map_meta pointer
+ * @ext_count: The number of extents needed
+ */
+static int
+famfs_meta_alloc(
+ struct famfs_file_meta **metap,
+ size_t ext_count)
+{
+ struct famfs_file_meta *meta;
+ size_t metasz;
+
+ *metap = NULL;
+
+ metasz = sizeof(*meta) + sizeof(*(meta->tfs_extents)) * ext_count;
+
+ meta = kzalloc(metasz, GFP_KERNEL);
+ if (!meta)
+ return -ENOMEM;
+
+ meta->tfs_extent_ct = ext_count;
+ *metap = meta;
+
+ return 0;
+}
+
+static void
+famfs_meta_free(
+ struct famfs_file_meta *map)
+{
+ kfree(map);
+}
+
+/**
+ * famfs_file_init_dax() - FAMFSIOC_MAP_CREATE ioctl handler
+ * @file:
+ * @arg: ptr to struct mcioc_map in user space
+ *
+ * Setup the dax mapping for a file. Files are created empty, and then function is called
+ * (by famfs_file_ioctl()) to setup the mapping and set the file size.
+ */
+static int
+famfs_file_init_dax(
+ struct file *file,
+ void __user *arg)
+{
+ struct famfs_extent *tfs_extents = NULL;
+ struct famfs_file_meta *meta = NULL;
+ struct inode *inode;
+ struct famfs_ioc_map imap;
+ struct famfs_fs_info *fsi;
+ struct super_block *sb;
+ int alignment_errs = 0;
+ size_t extent_total = 0;
+ size_t ext_count;
+ int rc = 0;
+ int i;
+
+ rc = copy_from_user(&imap, arg, sizeof(imap));
+ if (rc)
+ return -EFAULT;
+
+ ext_count = imap.ext_list_count;
+ if (ext_count < 1) {
+ rc = -ENOSPC;
+ goto errout;
+ }
+
+ if (ext_count > FAMFS_MAX_EXTENTS) {
+ rc = -E2BIG;
+ goto errout;
+ }
+
+ inode = file_inode(file);
+ if (!inode) {
+ rc = -EBADF;
+ goto errout;
+ }
+ sb = inode->i_sb;
+ fsi = inode->i_sb->s_fs_info;
+
+ tfs_extents = &imap.ext_list[0];
+
+ rc = famfs_meta_alloc(&meta, ext_count);
+ if (rc)
+ goto errout;
+
+ meta->file_type = imap.file_type;
+ meta->file_size = imap.file_size;
+
+ /* Fill in the internal file metadata structure */
+ for (i = 0; i < imap.ext_list_count; i++) {
+ size_t len;
+ off_t offset;
+
+ offset = imap.ext_list[i].offset;
+ len = imap.ext_list[i].len;
+
+ extent_total += len;
+
+ if (WARN_ON(offset == 0 && meta->file_type != FAMFS_SUPERBLOCK)) {
+ rc = -EINVAL;
+ goto errout;
+ }
+
+ meta->tfs_extents[i].offset = offset;
+ meta->tfs_extents[i].len = len;
+
+ /* All extent addresses/offsets must be 2MiB aligned,
+ * and all but the last length must be a 2MiB multiple.
+ */
+ if (!IS_ALIGNED(offset, PMD_SIZE)) {
+ pr_err("%s: error ext %d hpa %lx not aligned\n",
+ __func__, i, offset);
+ alignment_errs++;
+ }
+ if (i < (imap.ext_list_count - 1) && !IS_ALIGNED(len, PMD_SIZE)) {
+ pr_err("%s: error ext %d length %ld not aligned\n",
+ __func__, i, len);
+ alignment_errs++;
+ }
+ }
+
+ /*
+ * File size can be <= ext list size, since extent sizes are constrained
+ * to PMD multiples
+ */
+ if (imap.file_size > extent_total) {
+ pr_err("%s: file size %lld larger than ext list size %lld\n",
+ __func__, (u64)imap.file_size, (u64)extent_total);
+ rc = -EINVAL;
+ goto errout;
+ }
+
+ if (alignment_errs > 0) {
+ pr_err("%s: there were %d alignment errors in the extent list\n",
+ __func__, alignment_errs);
+ rc = -EINVAL;
+ goto errout;
+ }
+
+ /* Publish the famfs metadata on inode->i_private */
+ inode_lock(inode);
+ if (inode->i_private) {
+ rc = -EEXIST; /* file already has famfs metadata */
+ } else {
+ inode->i_private = meta;
+ i_size_write(inode, imap.file_size);
+ inode->i_flags |= S_DAX;
+ }
+ inode_unlock(inode);
+
+ errout:
+ if (rc)
+ famfs_meta_free(meta);
+
+ return rc;
+}
+
+/**
+ * famfs_file_ioctl() - top-level famfs file ioctl handler
+ * @file:
+ * @cmd:
+ * @arg:
+ */
+static
+long
+famfs_file_ioctl(
+ struct file *file,
+ unsigned int cmd,
+ unsigned long arg)
+{
+ long rc;
+
+ switch (cmd) {
+ case FAMFSIOC_NOP:
+ rc = 0;
+ break;
+
+ case FAMFSIOC_MAP_CREATE:
+ rc = famfs_file_init_dax(file, (void *)arg);
+ break;
+
+ case FAMFSIOC_MAP_GET: {
+ struct inode *inode = file_inode(file);
+ struct famfs_file_meta *meta = inode->i_private;
+ struct famfs_ioc_map umeta;
+
+ memset(&umeta, 0, sizeof(umeta));
+
+ if (meta) {
+ /* TODO: do more to harmonize these structures */
+ umeta.extent_type = meta->tfs_extent_type;
+ umeta.file_size = i_size_read(inode);
+ umeta.ext_list_count = meta->tfs_extent_ct;
+
+ rc = copy_to_user((void __user *)arg, &umeta, sizeof(umeta));
+ if (rc)
+ pr_err("%s: copy_to_user returned %ld\n", __func__, rc);
+
+ } else {
+ rc = -EINVAL;
+ }
+ }
+ break;
+ case FAMFSIOC_MAP_GETEXT: {
+ struct inode *inode = file_inode(file);
+ struct famfs_file_meta *meta = inode->i_private;
+
+ if (meta)
+ rc = copy_to_user((void __user *)arg, meta->tfs_extents,
+ meta->tfs_extent_ct * sizeof(struct famfs_extent));
+ else
+ rc = -EINVAL;
+ }
+ break;
+ default:
+ rc = -ENOTTY;
+ break;
+ }
+
+ return rc;
+}
+
/*********************************************************************
* file_operations
*/
@@ -143,6 +368,7 @@ const struct file_operations famfs_file_operations = {
/* Custom famfs operations */
.write_iter = famfs_dax_write_iter,
.read_iter = famfs_dax_read_iter,
+ .unlocked_ioctl = famfs_file_ioctl,
.mmap = famfs_file_mmap,
/* Force PMD alignment for mmap */
--
2.43.0
next prev parent reply other threads:[~2024-02-23 17:43 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-23 17:41 [RFC PATCH 00/20] Introduce the famfs shared-memory file system John Groves
2024-02-23 17:41 ` [RFC PATCH 01/20] famfs: Documentation John Groves
2024-02-23 17:41 ` [RFC PATCH 02/20] dev_dax_iomap: Add fs_dax_get() func to prepare dax for fs-dax usage John Groves
2024-02-26 12:05 ` Jonathan Cameron
2024-02-26 15:00 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 03/20] dev_dax_iomap: Move dax_pgoff_to_phys from device.c to bus.c since both need it now John Groves
2024-02-26 12:10 ` Jonathan Cameron
2024-02-26 15:13 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 04/20] dev_dax_iomap: Save the kva from memremap John Groves
2024-02-26 12:21 ` Jonathan Cameron
2024-02-26 15:48 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 05/20] dev_dax_iomap: Add dax_operations for use by fs-dax on devdax John Groves
2024-02-26 12:32 ` Jonathan Cameron
2024-02-26 16:09 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 06/20] dev_dax_iomap: Add CONFIG_DEV_DAX_IOMAP kernel build parameter John Groves
2024-02-26 12:34 ` Jonathan Cameron
2024-02-26 16:12 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 07/20] famfs: Add include/linux/famfs_ioctl.h John Groves
2024-02-24 1:39 ` Randy Dunlap
2024-02-24 2:23 ` John Groves
2024-02-24 3:27 ` Randy Dunlap
2024-02-24 23:32 ` John Groves
2024-02-24 23:40 ` Randy Dunlap
2024-02-26 12:39 ` Jonathan Cameron
2024-02-26 16:44 ` John Groves
2024-02-26 16:56 ` Jonathan Cameron
2024-02-26 18:04 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 08/20] famfs: Add famfs_internal.h John Groves
2024-02-26 12:48 ` Jonathan Cameron
2024-02-26 17:35 ` John Groves
2024-02-27 10:28 ` Jonathan Cameron
2024-02-28 1:06 ` John Groves
2024-02-27 13:38 ` Christian Brauner
2024-02-27 14:12 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 09/20] famfs: Add super_operations John Groves
2024-02-26 12:51 ` Jonathan Cameron
2024-02-26 21:47 ` John Groves
2024-02-27 10:34 ` Jonathan Cameron
2024-02-27 17:48 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 10/20] famfs: famfs_open_device() & dax_holder_operations John Groves
2024-02-26 12:56 ` Jonathan Cameron
2024-02-26 22:22 ` John Groves
2024-02-27 13:39 ` Christian Brauner
2024-02-27 18:38 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 11/20] famfs: Add fs_context_operations John Groves
2024-02-26 13:20 ` Jonathan Cameron
2024-02-26 22:43 ` John Groves
2024-02-27 13:41 ` Christian Brauner
2024-02-28 0:59 ` John Groves
2024-02-28 1:49 ` Randy Dunlap
2024-02-28 8:17 ` Christian Brauner
2024-02-28 10:07 ` Christian Brauner
2024-02-28 12:01 ` Christian Brauner
2024-02-23 17:41 ` [RFC PATCH 12/20] famfs: Add inode_operations and file_system_type John Groves
2024-02-26 13:25 ` Jonathan Cameron
2024-02-26 22:53 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 13/20] famfs: Add iomap_ops John Groves
2024-02-26 13:30 ` Jonathan Cameron
2024-02-26 23:00 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 14/20] famfs: Add struct file_operations John Groves
2024-02-26 13:32 ` Jonathan Cameron
2024-02-26 23:09 ` John Groves
2024-02-23 17:41 ` John Groves [this message]
2024-02-26 13:44 ` [RFC PATCH 15/20] famfs: Add ioctl to file_operations Jonathan Cameron
2024-02-23 17:42 ` [RFC PATCH 16/20] famfs: Add fault counters John Groves
2024-02-23 18:23 ` Dave Hansen
2024-02-23 19:56 ` John Groves
2024-02-23 20:04 ` Dan Williams
2024-02-23 20:39 ` John Groves
2024-02-23 21:19 ` Dave Hansen
2024-02-23 23:50 ` Dan Williams
2024-02-24 3:59 ` Matthew Wilcox
2024-02-24 4:30 ` Dan Williams
2024-02-23 17:42 ` [RFC PATCH 17/20] famfs: Add module stuff John Groves
2024-02-26 13:47 ` Jonathan Cameron
2024-02-27 22:15 ` John Groves
2024-02-23 17:42 ` [RFC PATCH 18/20] famfs: Support character dax via the dev_dax_iomap patch John Groves
2024-02-26 13:52 ` Jonathan Cameron
2024-02-27 22:27 ` John Groves
2024-02-23 17:42 ` [RFC PATCH 19/20] famfs: Update MAINTAINERS file John Groves
2024-02-23 17:42 ` [RFC PATCH 20/20] famfs: Add Kconfig and Makefile plumbing John Groves
2024-02-24 1:50 ` Randy Dunlap
2024-02-24 2:24 ` John Groves
2024-02-24 0:07 ` [RFC PATCH 00/20] Introduce the famfs shared-memory file system Luis Chamberlain
2024-02-26 13:27 ` John Groves
2024-02-26 15:53 ` Luis Chamberlain
2024-02-26 21:16 ` John Groves
2024-02-27 0:58 ` Luis Chamberlain
2024-02-27 2:05 ` John Groves
2024-02-29 2:15 ` Dave Chinner
2024-02-29 14:52 ` John Groves
2024-03-11 1:29 ` Dave Chinner
2024-02-29 6:52 ` Amir Goldstein
2024-02-29 22:16 ` John Groves
2024-05-17 9:55 ` Miklos Szeredi
2024-05-19 5:59 ` Amir Goldstein
2024-05-22 2:05 ` John Groves
2024-05-22 8:58 ` Miklos Szeredi
2024-05-22 10:16 ` Amir Goldstein
2024-05-22 11:28 ` Miklos Szeredi
2024-05-22 13:41 ` Amir Goldstein
2024-05-23 2:49 ` John Groves
2024-05-23 13:57 ` Miklos Szeredi
2024-05-24 0:47 ` John Groves
2024-05-24 7:55 ` Miklos Szeredi
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