Simplify passing the count and mount to simple_pin_fs and simple_release_fs by wrapping them in the simple_fs struct, in preparation for adding more high level operations to fs/libfs.c
There is no functional change intended.
Signed-off-by: Emanuele Giuseppe Esposito eesposit@redhat.com --- drivers/gpu/drm/drm_drv.c | 11 ++++---- drivers/misc/cxl/api.c | 13 +++++----- drivers/scsi/cxlflash/ocxl_hw.c | 14 +++++----- fs/binfmt_misc.c | 9 +++---- fs/configfs/mount.c | 10 +++----- fs/debugfs/inode.c | 22 ++++++++-------- fs/libfs.c | 45 +++++++++++++++++++++++++-------- fs/tracefs/inode.c | 18 ++++++------- include/linux/fs.h | 10 ++++++-- security/apparmor/apparmorfs.c | 25 +++++++++--------- security/inode.c | 11 ++++---- 11 files changed, 103 insertions(+), 85 deletions(-)
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 7b1a628d1f6e..e29424d64874 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -514,8 +514,7 @@ EXPORT_SYMBOL(drm_dev_unplug); * iput(), but this way you'd end up with a new vfsmount for each inode. */
-static int drm_fs_cnt; -static struct vfsmount *drm_fs_mnt; +static struct simple_fs drm_fs;
static int drm_fs_init_fs_context(struct fs_context *fc) { @@ -534,15 +533,15 @@ static struct inode *drm_fs_inode_new(void) struct inode *inode; int r;
- r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); + r = simple_pin_fs(&drm_fs, &drm_fs_type); if (r < 0) { DRM_ERROR("Cannot mount pseudo fs: %d\n", r); return ERR_PTR(r); }
- inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); + inode = alloc_anon_inode(drm_fs.mount->mnt_sb); if (IS_ERR(inode)) - simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); + simple_release_fs(&drm_fs);
return inode; } @@ -551,7 +550,7 @@ static void drm_fs_inode_free(struct inode *inode) { if (inode) { iput(inode); - simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); + simple_release_fs(&drm_fs); } }
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c index b493de962153..67e4808bce49 100644 --- a/drivers/misc/cxl/api.c +++ b/drivers/misc/cxl/api.c @@ -31,8 +31,7 @@
#define CXL_PSEUDO_FS_MAGIC 0x1697697f
-static int cxl_fs_cnt; -static struct vfsmount *cxl_vfs_mount; +static struct simple_fs cxl_fs;
static int cxl_fs_init_fs_context(struct fs_context *fc) { @@ -50,7 +49,7 @@ static struct file_system_type cxl_fs_type = { void cxl_release_mapping(struct cxl_context *ctx) { if (ctx->kernelapi && ctx->mapping) - simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt); + simple_release_fs(&cxl_fs); }
static struct file *cxl_getfile(const char *name, @@ -66,20 +65,20 @@ static struct file *cxl_getfile(const char *name, if (fops->owner && !try_module_get(fops->owner)) return ERR_PTR(-ENOENT);
- rc = simple_pin_fs(&cxl_fs_type, &cxl_vfs_mount, &cxl_fs_cnt); + rc = simple_pin_fs(&cxl_fs, &cxl_fs_type); if (rc < 0) { pr_err("Cannot mount cxl pseudo filesystem: %d\n", rc); file = ERR_PTR(rc); goto err_module; }
- inode = alloc_anon_inode(cxl_vfs_mount->mnt_sb); + inode = alloc_anon_inode(cxl_fs.mount->mnt_sb); if (IS_ERR(inode)) { file = ERR_CAST(inode); goto err_fs; }
- file = alloc_file_pseudo(inode, cxl_vfs_mount, name, + file = alloc_file_pseudo(inode, cxl_fs.mount, name, flags & (O_ACCMODE | O_NONBLOCK), fops); if (IS_ERR(file)) goto err_inode; @@ -91,7 +90,7 @@ static struct file *cxl_getfile(const char *name, err_inode: iput(inode); err_fs: - simple_release_fs(&cxl_vfs_mount, &cxl_fs_cnt); + simple_release_fs(&cxl_fs); err_module: module_put(fops->owner); return file; diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c index 7018cd802569..7fa98dd4fa28 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ b/drivers/scsi/cxlflash/ocxl_hw.c @@ -29,8 +29,7 @@
#define OCXLFLASH_FS_MAGIC 0x1697698f
-static int ocxlflash_fs_cnt; -static struct vfsmount *ocxlflash_vfs_mount; +static struct simple_fs ocxlflash_fs;
static int ocxlflash_fs_init_fs_context(struct fs_context *fc) { @@ -51,7 +50,7 @@ static struct file_system_type ocxlflash_fs_type = { static void ocxlflash_release_mapping(struct ocxlflash_context *ctx) { if (ctx->mapping) - simple_release_fs(&ocxlflash_vfs_mount, &ocxlflash_fs_cnt); + simple_release_fs(&ocxlflash_fs); ctx->mapping = NULL; }
@@ -79,15 +78,14 @@ static struct file *ocxlflash_getfile(struct device *dev, const char *name, goto err1; }
- rc = simple_pin_fs(&ocxlflash_fs_type, &ocxlflash_vfs_mount, - &ocxlflash_fs_cnt); + rc = simple_pin_fs(&ocxlflash_fs, &ocxlflash_fs_type); if (unlikely(rc < 0)) { dev_err(dev, "%s: Cannot mount ocxlflash pseudofs rc=%d\n", __func__, rc); goto err2; }
- inode = alloc_anon_inode(ocxlflash_vfs_mount->mnt_sb); + inode = alloc_anon_inode(ocxlflash_fs.mount->mnt_sb); if (IS_ERR(inode)) { rc = PTR_ERR(inode); dev_err(dev, "%s: alloc_anon_inode failed rc=%d\n", @@ -95,7 +93,7 @@ static struct file *ocxlflash_getfile(struct device *dev, const char *name, goto err3; }
- file = alloc_file_pseudo(inode, ocxlflash_vfs_mount, name, + file = alloc_file_pseudo(inode, ocxlflash_fs.mount, name, flags & (O_ACCMODE | O_NONBLOCK), fops); if (IS_ERR(file)) { rc = PTR_ERR(file); @@ -110,7 +108,7 @@ static struct file *ocxlflash_getfile(struct device *dev, const char *name, err4: iput(inode); err3: - simple_release_fs(&ocxlflash_vfs_mount, &ocxlflash_fs_cnt); + simple_release_fs(&ocxlflash_fs); err2: module_put(fops->owner); err1: diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index cdb45829354d..3cff446f222b 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -64,8 +64,7 @@ typedef struct {
static DEFINE_RWLOCK(entries_lock); static struct file_system_type bm_fs_type; -static struct vfsmount *bm_mnt; -static int entry_count; +static struct simple_fs bm_fs;
/* * Max length of the register string. Determined by: @@ -623,7 +622,7 @@ static void kill_node(Node *e) drop_nlink(d_inode(dentry)); d_drop(dentry); dput(dentry); - simple_release_fs(&bm_mnt, &entry_count); + simple_release_fs(&bm_fs); }
/* /<entry> */ @@ -718,7 +717,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer, if (!inode) goto out2;
- err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count); + err = simple_pin_fs(&bm_fs, &bm_fs_type); if (err) { iput(inode); inode = NULL; @@ -732,7 +731,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer, if (IS_ERR(f)) { err = PTR_ERR(f); pr_notice("register: failed to install interpreter file %s\n", e->interpreter); - simple_release_fs(&bm_mnt, &entry_count); + simple_release_fs(&bm_fs); iput(inode); inode = NULL; goto out2; diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c index 0c6e8cf61953..9fb2791e5eed 100644 --- a/fs/configfs/mount.c +++ b/fs/configfs/mount.c @@ -24,9 +24,8 @@ /* Random magic number */ #define CONFIGFS_MAGIC 0x62656570
-static struct vfsmount *configfs_mount = NULL; +static struct simple_fs configfs_fs; struct kmem_cache *configfs_dir_cachep; -static int configfs_mnt_count = 0;
static void configfs_free_inode(struct inode *inode) @@ -123,14 +122,13 @@ MODULE_ALIAS_FS("configfs");
struct dentry *configfs_pin_fs(void) { - int err = simple_pin_fs(&configfs_fs_type, &configfs_mount, - &configfs_mnt_count); - return err ? ERR_PTR(err) : configfs_mount->mnt_root; + int err = simple_pin_fs(&configfs_fs, &configfs_fs_type); + return err ? ERR_PTR(err) : configfs_fs.mount->mnt_root; }
void configfs_release_fs(void) { - simple_release_fs(&configfs_mount, &configfs_mnt_count); + simple_release_fs(&configfs_fs); }
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index b7f2e971ecbc..5dbb74a23e7c 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -32,8 +32,7 @@
#define DEBUGFS_DEFAULT_MODE 0700
-static struct vfsmount *debugfs_mount; -static int debugfs_mount_count; +static struct simple_fs debugfs; static bool debugfs_registered;
/* @@ -297,7 +296,7 @@ struct dentry *debugfs_lookup(const char *name, struct dentry *parent) return NULL;
if (!parent) - parent = debugfs_mount->mnt_root; + parent = debugfs.mount->mnt_root;
dentry = lookup_positive_unlocked(name, parent, strlen(name)); if (IS_ERR(dentry)) @@ -316,8 +315,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) if (IS_ERR(parent)) return parent;
- error = simple_pin_fs(&debug_fs_type, &debugfs_mount, - &debugfs_mount_count); + error = simple_pin_fs(&debugfs, &debug_fs_type); if (error) { pr_err("Unable to pin filesystem for file '%s'\n", name); return ERR_PTR(error); @@ -329,7 +327,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) * have around. */ if (!parent) - parent = debugfs_mount->mnt_root; + parent = debugfs.mount->mnt_root;
inode_lock(d_inode(parent)); if (unlikely(IS_DEADDIR(d_inode(parent)))) @@ -349,7 +347,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
if (IS_ERR(dentry)) { inode_unlock(d_inode(parent)); - simple_release_fs(&debugfs_mount, &debugfs_mount_count); + simple_release_fs(&debugfs); }
return dentry; @@ -359,7 +357,7 @@ static struct dentry *failed_creating(struct dentry *dentry) { inode_unlock(d_inode(dentry->d_parent)); dput(dentry); - simple_release_fs(&debugfs_mount, &debugfs_mount_count); + simple_release_fs(&debugfs); return ERR_PTR(-ENOMEM); }
@@ -676,9 +674,9 @@ static void __debugfs_file_removed(struct dentry *dentry)
static void remove_one(struct dentry *victim) { - if (d_is_reg(victim)) + if (d_is_reg(victim)) __debugfs_file_removed(victim); - simple_release_fs(&debugfs_mount, &debugfs_mount_count); + simple_release_fs(&debugfs); }
/** @@ -699,9 +697,9 @@ void debugfs_remove(struct dentry *dentry) if (IS_ERR_OR_NULL(dentry)) return;
- simple_pin_fs(&debug_fs_type, &debugfs_mount, &debugfs_mount_count); + simple_pin_fs(&debugfs, &debug_fs_type); simple_recursive_removal(dentry, remove_one); - simple_release_fs(&debugfs_mount, &debugfs_mount_count); + simple_release_fs(&debugfs); } EXPORT_SYMBOL_GPL(debugfs_remove);
diff --git a/fs/libfs.c b/fs/libfs.c index 3759fbacf522..54e07ae986ca 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -665,39 +665,64 @@ EXPORT_SYMBOL(simple_fill_super);
static DEFINE_SPINLOCK(pin_fs_lock);
-int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) +/** + * simple_pin_fs - generic function to pin (mount if needed, + * otherwise add a reference to the mount) a filesystem + * @fs: a pointer to a the simple_fs struct containing a struct vfs_mount + * pointer (that can be NULL) and a counter. + * @type: a pointer to the file system type used by vfs_kern_mount. + * + * This function sets fs->mount if NULL, by calling vfs_kern_mount + * on @type. + * It also takes care of incrementing the reference counter. + * + * This function will return 0 in case of success, and PTR_ERR(-ERROR) + * if vfs_kern_mount fails. + **/ +int simple_pin_fs(struct simple_fs *fs, struct file_system_type *type) { struct vfsmount *mnt = NULL; spin_lock(&pin_fs_lock); - if (unlikely(!*mount)) { + if (unlikely(!fs->mount)) { spin_unlock(&pin_fs_lock); mnt = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL); if (IS_ERR(mnt)) return PTR_ERR(mnt); spin_lock(&pin_fs_lock); - if (!*mount) - *mount = mnt; + if (!fs->mount) + fs->mount = mnt; } - mntget(*mount); - ++*count; + mntget(fs->mount); + ++fs->count; spin_unlock(&pin_fs_lock); mntput(mnt); return 0; } EXPORT_SYMBOL(simple_pin_fs);
-void simple_release_fs(struct vfsmount **mount, int *count) +/** + * simple_release_fs - decrements the reference counter and unmounts the + * file system. + * @fs: a pointer to a struct simple_fs containing the reference counter + * and vfs_mount pointer + * + * This function decrements the refcount of the given file system and + * if 0 sets the mount pointer to NULL. + **/ +void simple_release_fs(struct simple_fs *fs) { struct vfsmount *mnt; spin_lock(&pin_fs_lock); - mnt = *mount; - if (!--*count) - *mount = NULL; + mnt = fs->mount; + if (!--fs->count) + fs->mount = NULL; spin_unlock(&pin_fs_lock); mntput(mnt); } EXPORT_SYMBOL(simple_release_fs);
+ + /** * simple_read_from_buffer - copy data from the buffer to user space * @to: the user space buffer to read to diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index 0ee8c6dfb036..370eb38ff1ad 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -24,8 +24,7 @@
#define TRACEFS_DEFAULT_MODE 0700
-static struct vfsmount *tracefs_mount; -static int tracefs_mount_count; +static struct simple_fs tracefs; static bool tracefs_registered;
static ssize_t default_read_file(struct file *file, char __user *buf, @@ -316,8 +315,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
pr_debug("tracefs: creating file '%s'\n",name);
- error = simple_pin_fs(&trace_fs_type, &tracefs_mount, - &tracefs_mount_count); + error = simple_pin_fs(&tracefs, &trace_fs_type); if (error) return ERR_PTR(error);
@@ -327,7 +325,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) * have around. */ if (!parent) - parent = tracefs_mount->mnt_root; + parent = tracefs.mount->mnt_root;
inode_lock(parent->d_inode); if (unlikely(IS_DEADDIR(parent->d_inode))) @@ -341,7 +339,7 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
if (IS_ERR(dentry)) { inode_unlock(parent->d_inode); - simple_release_fs(&tracefs_mount, &tracefs_mount_count); + simple_release_fs(&tracefs); }
return dentry; @@ -351,7 +349,7 @@ static struct dentry *failed_creating(struct dentry *dentry) { inode_unlock(dentry->d_parent->d_inode); dput(dentry); - simple_release_fs(&tracefs_mount, &tracefs_mount_count); + simple_release_fs(&tracefs); return NULL; }
@@ -504,7 +502,7 @@ __init struct dentry *tracefs_create_instance_dir(const char *name,
static void remove_one(struct dentry *victim) { - simple_release_fs(&tracefs_mount, &tracefs_mount_count); + simple_release_fs(&tracefs); }
/** @@ -520,9 +518,9 @@ void tracefs_remove(struct dentry *dentry) if (IS_ERR_OR_NULL(dentry)) return;
- simple_pin_fs(&trace_fs_type, &tracefs_mount, &tracefs_mount_count); + simple_pin_fs(&tracefs, &trace_fs_type); simple_recursive_removal(dentry, remove_one); - simple_release_fs(&tracefs_mount, &tracefs_mount_count); + simple_release_fs(&tracefs); }
/** diff --git a/include/linux/fs.h b/include/linux/fs.h index 4f6f59b4f22a..a3691c132b3a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3363,8 +3363,14 @@ struct tree_descr { const char *name; const struct file_operations *ops; int mod struct dentry *d_alloc_name(struct dentry *, const char *); extern int simple_fill_super(struct super_block *, unsigned long, const struct tree_descr *); -extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); -extern void simple_release_fs(struct vfsmount **mount, int *count); + +struct simple_fs { + struct vfsmount *mount; + int count; +}; + +extern int simple_pin_fs(struct simple_fs *, struct file_system_type *); +extern void simple_release_fs(struct simple_fs *);
extern ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos, const void *from, size_t available); diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c index 36f848734902..00f0158fb1e1 100644 --- a/security/apparmor/apparmorfs.c +++ b/security/apparmor/apparmorfs.c @@ -140,8 +140,7 @@ static int mangle_name(const char *name, char *target) */
#define AAFS_NAME "apparmorfs" -static struct vfsmount *aafs_mnt; -static int aafs_count; +static struct simple_fs aafs;
static int aafs_show_path(struct seq_file *seq, struct dentry *dentry) @@ -273,7 +272,7 @@ static struct dentry *aafs_create(const char *name, umode_t mode, if (!(mode & S_IFMT)) mode = (mode & S_IALLUGO) | S_IFREG;
- error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); + error = simple_pin_fs(&aafs, &aafs_ops); if (error) return ERR_PTR(error);
@@ -303,7 +302,7 @@ static struct dentry *aafs_create(const char *name, umode_t mode,
fail_lock: inode_unlock(dir); - simple_release_fs(&aafs_mnt, &aafs_count); + simple_release_fs(&aafs);
return ERR_PTR(error); } @@ -395,7 +394,7 @@ static void aafs_remove(struct dentry *dentry) dput(dentry); } inode_unlock(dir); - simple_release_fs(&aafs_mnt, &aafs_count); + simple_release_fs(&aafs); }
@@ -1824,7 +1823,7 @@ static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) * for pin_fs */ inode_unlock(dir); - error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count); + error = simple_pin_fs(&aafs, &aafs_ops); mutex_lock_nested(&parent->lock, parent->level); inode_lock_nested(dir, I_MUTEX_PARENT); if (error) @@ -1845,7 +1844,7 @@ static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode) aa_put_ns(ns); /* list ref remains */ out_pin: if (error) - simple_release_fs(&aafs_mnt, &aafs_count); + simple_release_fs(&aafs); out: mutex_unlock(&parent->lock); aa_put_ns(parent); @@ -2580,7 +2579,7 @@ static const char *policy_get_link(struct dentry *dentry, return ERR_PTR(-ECHILD);
ns = aa_get_current_ns(); - path.mnt = mntget(aafs_mnt); + path.mnt = mntget(aafs.mount); path.dentry = dget(ns_dir(ns)); error = nd_jump_link(&path); aa_put_ns(ns); @@ -2631,10 +2630,10 @@ static int __init aa_create_aafs(void) }
/* setup apparmorfs used to virtualize policy/ */ - aafs_mnt = kern_mount(&aafs_ops); - if (IS_ERR(aafs_mnt)) + aafs.mount = kern_mount(&aafs_ops); + if (IS_ERR(aafs.mount)) panic("can't set apparmorfs up\n"); - aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER; + aafs.mount->mnt_sb->s_flags &= ~SB_NOUSER;
/* Populate fs tree. */ error = entry_create_dir(&aa_sfs_entry, NULL); @@ -2667,8 +2666,8 @@ static int __init aa_create_aafs(void)
/* policy tree referenced by magic policy symlink */ mutex_lock_nested(&root_ns->lock, root_ns->level); - error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy", - aafs_mnt->mnt_root); + error = __aafs_ns_mkdir(root_ns, aafs.mount->mnt_root, ".policy", + aafs.mount->mnt_root); mutex_unlock(&root_ns->lock); if (error) goto error; diff --git a/security/inode.c b/security/inode.c index 6c326939750d..8a1bee35470a 100644 --- a/security/inode.c +++ b/security/inode.c @@ -22,8 +22,7 @@ #include <linux/lsm_hooks.h> #include <linux/magic.h>
-static struct vfsmount *mount; -static int mount_count; +static struct simple_fs securityfs;
static void securityfs_free_inode(struct inode *inode) { @@ -118,12 +117,12 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
pr_debug("securityfs: creating file '%s'\n",name);
- error = simple_pin_fs(&fs_type, &mount, &mount_count); + error = simple_pin_fs(&securityfs, &fs_type); if (error) return ERR_PTR(error);
if (!parent) - parent = mount->mnt_root; + parent = securityfs.mount->mnt_root;
dir = d_inode(parent);
@@ -168,7 +167,7 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode, dentry = ERR_PTR(error); out: inode_unlock(dir); - simple_release_fs(&mount, &mount_count); + simple_release_fs(&securityfs); return dentry; }
@@ -309,7 +308,7 @@ void securityfs_remove(struct dentry *dentry) dput(dentry); } inode_unlock(dir); - simple_release_fs(&mount, &mount_count); + simple_release_fs(&securityfs); } EXPORT_SYMBOL_GPL(securityfs_remove);