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Message-Id: <20230913111013.77623-7-hch@lst.de>
Date: Wed, 13 Sep 2023 08:10:00 -0300
From: Christoph Hellwig <hch@....de>
To: Christian Brauner <brauner@...nel.org>,
Al Viro <viro@...iv.linux.org.uk>
Cc: Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
Tejun Heo <tj@...nel.org>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna@...nel.org>,
Kees Cook <keescook@...omium.org>,
Damien Le Moal <dlemoal@...nel.org>,
Naohiro Aota <naohiro.aota@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-nfs@...r.kernel.org, linux-hardening@...r.kernel.org,
cgroups@...r.kernel.org
Subject: [PATCH 06/19] qibfs: use simple_release_fs
qibfs currently has convoluted code to allow registering HCAs while qibfs
is not mounted and vice versa. Switch to using simple_release_fs every
time an entry is added to pin the fs instance and remove all the boiler
plate code.
Signed-off-by: Christoph Hellwig <hch@....de>
---
drivers/infiniband/hw/qib/qib.h | 4 +-
drivers/infiniband/hw/qib/qib_fs.c | 105 ++++++---------------------
drivers/infiniband/hw/qib/qib_init.c | 32 +++-----
3 files changed, 36 insertions(+), 105 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index 26c615772be390..f73c321d0bff88 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -1370,10 +1370,10 @@ void qib_device_remove(struct qib_devdata *);
extern int qib_qsfp_dump(struct qib_pportdata *ppd, char *buf, int len);
int __init qib_init_qibfs(void);
-int __exit qib_exit_qibfs(void);
+void __exit qib_exit_qibfs(void);
int qibfs_add(struct qib_devdata *);
-int qibfs_remove(struct qib_devdata *);
+void qibfs_remove(struct qib_devdata *);
int qib_pcie_init(struct pci_dev *, const struct pci_device_id *);
int qib_pcie_ddinit(struct qib_devdata *, struct pci_dev *,
diff --git a/drivers/infiniband/hw/qib/qib_fs.c b/drivers/infiniband/hw/qib/qib_fs.c
index ed7d4b02f45a63..c52ca34b32e67d 100644
--- a/drivers/infiniband/hw/qib/qib_fs.c
+++ b/drivers/infiniband/hw/qib/qib_fs.c
@@ -43,7 +43,9 @@
#define QIBFS_MAGIC 0x726a77
-static struct super_block *qib_super;
+static struct file_system_type qibfs_fs_type;
+static struct vfsmount *qib_mount;
+static int qib_mnt_count;
#define private2dd(file) (file_inode(file)->i_private)
@@ -355,15 +357,19 @@ static const struct file_operations flash_ops = {
.llseek = default_llseek,
};
-static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
+int qibfs_add(struct qib_devdata *dd)
{
struct dentry *dir, *tmp;
char unit[10];
int ret, i;
+
+ ret = simple_pin_fs(&qibfs_fs_type, &qib_mount, &qib_mnt_count);
+ if (ret)
+ return ret;
/* create the per-unit directory */
snprintf(unit, sizeof(unit), "%u", dd->unit);
- ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
+ ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, qib_mount->mnt_root, &dir,
&simple_dir_operations, dd);
if (ret) {
pr_err("create_file(%s) failed: %d\n", unit, ret);
@@ -422,65 +428,35 @@ static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
pr_err("create_file(%s/flash) failed: %d\n",
unit, ret);
bail:
+ simple_release_fs(&qib_mount, &qib_mnt_count);
return ret;
}
-static int remove_device_files(struct super_block *sb,
- struct qib_devdata *dd)
+void qibfs_remove(struct qib_devdata *dd)
{
struct dentry *dir;
char unit[10];
snprintf(unit, sizeof(unit), "%u", dd->unit);
- dir = lookup_one_len_unlocked(unit, sb->s_root, strlen(unit));
-
- if (IS_ERR(dir)) {
- pr_err("Lookup of %s failed\n", unit);
- return PTR_ERR(dir);
- }
- simple_recursive_removal(dir, NULL);
- return 0;
+ dir = lookup_one_len_unlocked(unit, qib_mount->mnt_root, strlen(unit));
+ if (!IS_ERR(dir))
+ simple_recursive_removal(dir, NULL);
+ simple_release_fs(&qib_mount, &qib_mnt_count);
}
-/*
- * This fills everything in when the fs is mounted, to handle umount/mount
- * after device init. The direct add_cntr_files() call handles adding
- * them from the init code, when the fs is already mounted.
- */
static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc)
{
- struct qib_devdata *dd;
- unsigned long index;
- int ret;
-
static const struct tree_descr files[] = {
[2] = {"driver_stats", &driver_ops[0], S_IRUGO},
[3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
{""},
};
-
- ret = simple_fill_super(sb, QIBFS_MAGIC, files);
- if (ret) {
- pr_err("simple_fill_super failed: %d\n", ret);
- goto bail;
- }
-
- xa_for_each(&qib_dev_table, index, dd) {
- ret = add_cntr_files(sb, dd);
- if (ret)
- goto bail;
- }
-
-bail:
- return ret;
+ return simple_fill_super(sb, QIBFS_MAGIC, files);
}
static int qibfs_get_tree(struct fs_context *fc)
{
- int ret = get_tree_single(fc, qibfs_fill_super);
- if (ret == 0)
- qib_super = fc->root->d_sb;
- return ret;
+ return get_tree_single(fc, qibfs_fill_super);
}
static const struct fs_context_operations qibfs_context_ops = {
@@ -493,46 +469,11 @@ static int qibfs_init_fs_context(struct fs_context *fc)
return 0;
}
-static void qibfs_kill_super(struct super_block *s)
-{
- kill_litter_super(s);
- qib_super = NULL;
-}
-
-int qibfs_add(struct qib_devdata *dd)
-{
- int ret;
-
- /*
- * On first unit initialized, qib_super will not yet exist
- * because nobody has yet tried to mount the filesystem, so
- * we can't consider that to be an error; if an error occurs
- * during the mount, that will get a complaint, so this is OK.
- * add_cntr_files() for all units is done at mount from
- * qibfs_fill_super(), so one way or another, everything works.
- */
- if (qib_super == NULL)
- ret = 0;
- else
- ret = add_cntr_files(qib_super, dd);
- return ret;
-}
-
-int qibfs_remove(struct qib_devdata *dd)
-{
- int ret = 0;
-
- if (qib_super)
- ret = remove_device_files(qib_super, dd);
-
- return ret;
-}
-
static struct file_system_type qibfs_fs_type = {
- .owner = THIS_MODULE,
- .name = "ipathfs",
- .init_fs_context = qibfs_init_fs_context,
- .kill_sb = qibfs_kill_super,
+ .owner = THIS_MODULE,
+ .name = "ipathfs",
+ .init_fs_context = qibfs_init_fs_context,
+ .kill_sb = kill_litter_super,
};
MODULE_ALIAS_FS("ipathfs");
@@ -541,7 +482,7 @@ int __init qib_init_qibfs(void)
return register_filesystem(&qibfs_fs_type);
}
-int __exit qib_exit_qibfs(void)
+void __exit qib_exit_qibfs(void)
{
- return unregister_filesystem(&qibfs_fs_type);
+ unregister_filesystem(&qibfs_fs_type);
}
diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index 33667becd52b04..46306573a37a7d 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -1217,9 +1217,13 @@ static int __init qib_ib_init(void)
{
int ret;
+ ret = qib_init_qibfs();
+ if (ret)
+ return ret;
+
ret = qib_dev_init();
if (ret)
- goto bail;
+ goto bail_fs;
/*
* These must be called before the driver is registered with
@@ -1237,10 +1241,7 @@ static int __init qib_ib_init(void)
goto bail_dev;
}
- /* not fatal if it doesn't work */
- if (qib_init_qibfs())
- pr_err("Unable to register ipathfs\n");
- goto bail; /* all OK */
+ return ret;
bail_dev:
#ifdef CONFIG_INFINIBAND_QIB_DCA
@@ -1250,7 +1251,8 @@ static int __init qib_ib_init(void)
qib_dbg_exit();
#endif
qib_dev_cleanup();
-bail:
+bail_fs:
+ qib_exit_qibfs();
return ret;
}
@@ -1261,14 +1263,6 @@ module_init(qib_ib_init);
*/
static void __exit qib_ib_cleanup(void)
{
- int ret;
-
- ret = qib_exit_qibfs();
- if (ret)
- pr_err(
- "Unable to cleanup counter filesystem: error %d\n",
- -ret);
-
#ifdef CONFIG_INFINIBAND_QIB_DCA
dca_unregister_notify(&dca_notifier);
#endif
@@ -1282,6 +1276,7 @@ static void __exit qib_ib_cleanup(void)
WARN_ON(!xa_empty(&qib_dev_table));
qib_dev_cleanup();
+ qib_exit_qibfs();
}
module_exit(qib_ib_cleanup);
@@ -1469,7 +1464,7 @@ static int qib_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (qib_mini_init)
goto bail;
if (!j) {
- (void) qibfs_remove(dd);
+ qibfs_remove(dd);
qib_device_remove(dd);
}
if (!ret)
@@ -1496,7 +1491,6 @@ static int qib_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
static void qib_remove_one(struct pci_dev *pdev)
{
struct qib_devdata *dd = pci_get_drvdata(pdev);
- int ret;
/* unregister from IB core */
qib_unregister_ib_device(dd);
@@ -1513,11 +1507,7 @@ static void qib_remove_one(struct pci_dev *pdev)
/* wait until all of our (qsfp) queue_work() calls complete */
flush_workqueue(ib_wq);
- ret = qibfs_remove(dd);
- if (ret)
- qib_dev_err(dd, "Failed counters filesystem cleanup: %d\n",
- -ret);
-
+ qibfs_remove(dd);
qib_device_remove(dd);
qib_postinit_cleanup(dd);
--
2.39.2
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