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authorRoland Dreier <rolandd@cisco.com>2010-02-25 03:51:20 +0300
committerRoland Dreier <rolandd@cisco.com>2010-02-25 03:51:20 +0300
commita265e5587f078618c1f17c3a83da65046f18746f (patch)
treec2de5a76d93353c564348f3052a4ef17316c3754 /drivers/infiniband
parent920d706c892e8f8cfff95f46aeb95fc6344f0bd5 (diff)
downloadlinux-a265e5587f078618c1f17c3a83da65046f18746f.tar.xz
IB/uverbs: Use anon_inodes instead of private infinibandeventfs
The anon_inodes interface has been split to allow creating a bare (non-installed) file pointer and also extended to allow specifying O_RDONLY in the flags. This makes it a suitable replacement for the private "infinibandeventfs" pseudo-filesystem used by uverbs, and this replacement saves a small chunk of boilerplate code. Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/Kconfig1
-rw-r--r--drivers/infiniband/core/uverbs_main.c60
2 files changed, 5 insertions, 56 deletions
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index dd0db67bf8d7..975adce5f40c 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -20,6 +20,7 @@ config INFINIBAND_USER_MAD
config INFINIBAND_USER_ACCESS
tristate "InfiniBand userspace access (verbs and CM)"
+ select ANON_INODES
---help---
Userspace InfiniBand access support. This enables the
kernel side of userspace verbs and the userspace
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 5f284ffd430e..82b60c65dd4d 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -42,8 +42,8 @@
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/file.h>
-#include <linux/mount.h>
#include <linux/cdev.h>
+#include <linux/anon_inodes.h>
#include <asm/uaccess.h>
@@ -53,8 +53,6 @@ MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace verbs access");
MODULE_LICENSE("Dual BSD/GPL");
-#define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */
-
enum {
IB_UVERBS_MAJOR = 231,
IB_UVERBS_BASE_MINOR = 192,
@@ -111,8 +109,6 @@ static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
[IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
};
-static struct vfsmount *uverbs_event_mnt;
-
static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device);
@@ -492,7 +488,6 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
int is_async, int *fd)
{
struct ib_uverbs_event_file *ev_file;
- struct path path;
struct file *filp;
int ret;
@@ -515,27 +510,16 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
goto err;
}
- /*
- * fops_get() can't fail here, because we're coming from a
- * system call on a uverbs file, which will already have a
- * module reference.
- */
- path.mnt = uverbs_event_mnt;
- path.dentry = uverbs_event_mnt->mnt_root;
- path_get(&path);
- filp = alloc_file(&path, FMODE_READ, fops_get(&uverbs_event_fops));
+ filp = anon_inode_getfile("[uverbs-event]", &uverbs_event_fops,
+ ev_file, O_RDONLY);
if (!filp) {
ret = -ENFILE;
goto err_fd;
}
- filp->private_data = ev_file;
-
return filp;
err_fd:
- fops_put(&uverbs_event_fops);
- path_put(&path);
put_unused_fd(*fd);
err:
@@ -825,21 +809,6 @@ static void ib_uverbs_remove_one(struct ib_device *device)
kfree(uverbs_dev);
}
-static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data,
- struct vfsmount *mnt)
-{
- return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
- INFINIBANDEVENTFS_MAGIC, mnt);
-}
-
-static struct file_system_type uverbs_event_fs = {
- /* No owner field so module can be unloaded */
- .name = "infinibandeventfs",
- .get_sb = uverbs_event_get_sb,
- .kill_sb = kill_litter_super
-};
-
static int __init ib_uverbs_init(void)
{
int ret;
@@ -864,33 +833,14 @@ static int __init ib_uverbs_init(void)
goto out_class;
}
- ret = register_filesystem(&uverbs_event_fs);
- if (ret) {
- printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
- goto out_class;
- }
-
- uverbs_event_mnt = kern_mount(&uverbs_event_fs);
- if (IS_ERR(uverbs_event_mnt)) {
- ret = PTR_ERR(uverbs_event_mnt);
- printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
- goto out_fs;
- }
-
ret = ib_register_client(&uverbs_client);
if (ret) {
printk(KERN_ERR "user_verbs: couldn't register client\n");
- goto out_mnt;
+ goto out_class;
}
return 0;
-out_mnt:
- mntput(uverbs_event_mnt);
-
-out_fs:
- unregister_filesystem(&uverbs_event_fs);
-
out_class:
class_destroy(uverbs_class);
@@ -904,8 +854,6 @@ out:
static void __exit ib_uverbs_cleanup(void)
{
ib_unregister_client(&uverbs_client);
- mntput(uverbs_event_mnt);
- unregister_filesystem(&uverbs_event_fs);
class_destroy(uverbs_class);
unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
idr_destroy(&ib_uverbs_pd_idr);