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Groups > linux.kernel > #1665961
| From | David Howells <dhowells@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 25/27] ipc: Convert mqueue fs to fs_context [ver #5] |
| Date | 2017-06-14 17:20 +0200 |
| Message-ID | <tSifp-6QJ-41@gated-at.bofh.it> (permalink) |
| References | <tSifn-6QJ-7@gated-at.bofh.it> |
| Organization | Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 |
Convert the mqueue filesystem to use the filesystem context stuff.
Notes:
(1) The relevant ipc namespace is selected in when the context is
initialised (and it defaults to the current task's ipc namespace).
The caller can override this before calling vfs_get_tree().
(2) Rather than simply calling kern_mount_data(), mq_init_ns() creates a
context, adjusts it and then does the rest of the mount procedure.
Signed-off-by: David Howells <dhowells@redhat.com>
---
ipc/mqueue.c | 90 ++++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 68 insertions(+), 22 deletions(-)
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 9e3a0aab4416..5a0594a79855 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -18,6 +18,7 @@
#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/mount.h>
+#include <linux/fs_context.h>
#include <linux/namei.h>
#include <linux/sysctl.h>
#include <linux/poll.h>
@@ -42,6 +43,11 @@
#include <net/sock.h>
#include "util.h"
+struct mqueue_fs_context {
+ struct fs_context fc;
+ struct ipc_namespace *ipc_ns;
+};
+
#define MQUEUE_MAGIC 0x19800202
#define DIRENT_SIZE 20
#define FILENT_SIZE 80
@@ -90,6 +96,7 @@ struct mqueue_inode_info {
static const struct inode_operations mqueue_dir_inode_operations;
static const struct file_operations mqueue_file_operations;
static const struct super_operations mqueue_super_ops;
+static const struct fs_context_operations mqueue_fs_context_ops;
static void remove_notification(struct mqueue_inode_info *info);
static struct kmem_cache *mqueue_inode_cachep;
@@ -305,7 +312,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
return ERR_PTR(ret);
}
-static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
+static int mqueue_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
struct ipc_namespace *ns = sb->s_fs_info;
@@ -326,18 +333,28 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
return 0;
}
-static struct dentry *mqueue_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int mqueue_get_tree(struct fs_context *fc)
{
- struct ipc_namespace *ns;
- if (flags & SB_KERNMOUNT) {
- ns = data;
- data = NULL;
- } else {
- ns = current->nsproxy->ipc_ns;
- }
- return mount_ns(fs_type, flags, data, ns, ns->user_ns, mqueue_fill_super);
+ struct mqueue_fs_context *ctx = container_of(fc, struct mqueue_fs_context, fc);
+
+ return mount_ns_fc(fc, mqueue_fill_super, ctx->ipc_ns);
+}
+
+static void mqueue_fs_context_free(struct fs_context *fc)
+{
+ struct mqueue_fs_context *ctx = container_of(fc, struct mqueue_fs_context, fc);
+
+ if (ctx->ipc_ns)
+ put_ipc_ns(ctx->ipc_ns);
+}
+
+static int mqueue_init_fs_context(struct fs_context *fc, struct super_block *src_sb)
+{
+ struct mqueue_fs_context *ctx = container_of(fc, struct mqueue_fs_context, fc);
+
+ ctx->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
+ ctx->fc.ops = &mqueue_fs_context_ops;
+ return 0;
}
static void init_once(void *foo)
@@ -1399,15 +1416,26 @@ static const struct super_operations mqueue_super_ops = {
.statfs = simple_statfs,
};
+static const struct fs_context_operations mqueue_fs_context_ops = {
+ .free = mqueue_fs_context_free,
+ .get_tree = mqueue_get_tree,
+};
+
static struct file_system_type mqueue_fs_type = {
- .name = "mqueue",
- .mount = mqueue_mount,
- .kill_sb = kill_litter_super,
- .fs_flags = FS_USERNS_MOUNT,
+ .name = "mqueue",
+ .fs_context_size = sizeof(struct mqueue_fs_context),
+ .init_fs_context = mqueue_init_fs_context,
+ .kill_sb = kill_litter_super,
+ .fs_flags = FS_USERNS_MOUNT,
};
int mq_init_ns(struct ipc_namespace *ns)
{
+ struct mqueue_fs_context *ctx;
+ struct fs_context *fc;
+ struct vfsmount *mnt;
+ int ret;
+
ns->mq_queues_count = 0;
ns->mq_queues_max = DFLT_QUEUESMAX;
ns->mq_msg_max = DFLT_MSGMAX;
@@ -1415,13 +1443,31 @@ int mq_init_ns(struct ipc_namespace *ns)
ns->mq_msg_default = DFLT_MSG;
ns->mq_msgsize_default = DFLT_MSGSIZE;
- ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns);
- if (IS_ERR(ns->mq_mnt)) {
- int err = PTR_ERR(ns->mq_mnt);
- ns->mq_mnt = NULL;
- return err;
+ fc = vfs_new_fs_context(&mqueue_fs_type, NULL, 0, FS_CONTEXT_FOR_NEW);
+ if (IS_ERR(fc))
+ return PTR_ERR(fc);
+
+ ctx = container_of(fc, struct mqueue_fs_context, fc);
+ if (ctx->ipc_ns != ns) {
+ put_ipc_ns(ctx->ipc_ns);
+ ctx->ipc_ns = get_ipc_ns(ns);
}
- return 0;
+
+ ret = vfs_get_tree(fc);
+ if (ret < 0)
+ goto out_fc;
+
+ mnt = kern_mount_data_fc(fc);
+ if (IS_ERR(mnt)) {
+ ret = PTR_ERR(mnt);
+ goto out_fc;
+ }
+
+ ns->mq_mnt = mnt;
+ ret = 0;
+out_fc:
+ put_fs_context(fc);
+ return ret;
}
void mq_clear_sbinfo(struct ipc_namespace *ns)
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[RFC][PATCH 00/27] VFS: Introduce filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 11/27] VFS: Remove unused code after filesystem context changes [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 20/27] NFS: Split nfs_parse_mount_options() [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 03/27] VFS: Make get_mnt_ns() return the namespace [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
Re: [PATCH 03/27] VFS: Make get_mnt_ns() return the namespace [ver #5] Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-15 11:20 +0200
[PATCH 27/27] kernfs, sysfs, cgroup: Support fs_context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
Re: [PATCH 27/27] kernfs, sysfs, cgroup: Support fs_context [ver #5] Tejun Heo <tj@kernel.org> - 2017-06-14 20:00 +0200
Re: [PATCH 27/27] ... and the intel_rdt driver David Howells <dhowells@redhat.com> - 2017-06-15 00:40 +0200
[PATCH 26/27] cpuset: Use fs_context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 16/27] proc: Add fs_context support to procfs [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
Re: [PATCH 16/27] proc: Add fs_context support to procfs [ver #5] Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-15 12:20 +0200
[PATCH 01/27] Provide a function to create a NUL-terminated string from unterminated data [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 09/27] VFS: Add LSM hooks for filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 25/27] ipc: Convert mqueue fs to fs_context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
Re: [PATCH 25/27] ipc: Convert mqueue fs to fs_context [ver #5] Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-15 12:10 +0200
Re: [PATCH 25/27] ipc: Convert mqueue fs to fs_context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-15 16:50 +0200
[PATCH 23/27] NFS: Do some tidying of the parsing code [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 22/27] NFS: Add a small buffer in nfs_fs_context to avoid string dup [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 14/27] VFS: Add a sample program for fsopen/fsmount [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 02/27] VFS: Clean up whitespace in fs/namespace.c and fs/super.c [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 04/27] VFS: Make get_filesystem() return the affected filesystem [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 18/27] NFS: Constify mount argument match tables [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:20 +0200
[PATCH 05/27] VFS: Provide empty name qstr [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:30 +0200
[PATCH 15/27] procfs: Move proc_fill_super() to fs/proc/root.c [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:30 +0200
[PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:30 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Randy Dunlap <rdunlap@infradead.org> - 2017-06-14 20:10 +0200
Updated docs David Howells <dhowells@redhat.com> - 2017-06-15 01:00 +0200
Re: Updated docs Randy Dunlap <rdunlap@infradead.org> - 2017-06-15 04:00 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Casey Schaufler <casey@schaufler-ca.com> - 2017-06-14 22:10 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 22:50 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Casey Schaufler <casey@schaufler-ca.com> - 2017-06-14 23:00 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Theodore Ts'o <tytso@mit.edu> - 2017-06-17 12:00 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-17 16:20 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Jeff Layton <jlayton@redhat.com> - 2017-06-17 17:00 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] Randy Dunlap <rdunlap@infradead.org> - 2017-06-17 17:20 +0200
Re: [PATCH 08/27] VFS: Introduce the structs and doc for a filesystem context [ver #5] David Howells <dhowells@redhat.com> - 2017-06-19 09:50 +0200
[PATCH 21/27] NFS: Deindent nfs_fs_context_parse_option() [ver #5] David Howells <dhowells@redhat.com> - 2017-06-14 17:30 +0200
Re: [PATCH 07/27] VFS: Differentiate mount flags (MS_*) from internal superblock flags [ver #5] Al Viro <viro@ZenIV.linux.org.uk> - 2017-06-15 11:50 +0200
Re: [PATCH 07/27] VFS: Differentiate mount flags (MS_*) from internal superblock flags [ver #5] Christoph Hellwig <hch@infradead.org> - 2017-06-16 11:10 +0200
Re: [PATCH 07/27] VFS: Differentiate mount flags (MS_*) from internal superblock flags [ver #5] David Howells <dhowells@redhat.com> - 2017-06-16 17:00 +0200
Re: [PATCH 07/27] VFS: Differentiate mount flags (MS_*) from internal superblock flags [ver #5] Christoph Hellwig <hch@infradead.org> - 2017-06-16 18:00 +0200
Re: [PATCH 07/27] VFS: Differentiate mount flags (MS_*) from internal superblock flags [ver #5] David Howells <dhowells@redhat.com> - 2017-06-16 18:00 +0200
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