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-rw-r--r--fs/aufs/sysfs.c372
1 files changed, 0 insertions, 372 deletions
diff --git a/fs/aufs/sysfs.c b/fs/aufs/sysfs.c
deleted file mode 100644
index 549f71d1a..000000000
--- a/fs/aufs/sysfs.c
+++ /dev/null
@@ -1,372 +0,0 @@
-/*
- * Copyright (C) 2005-2015 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sysfs interface
- */
-
-#include <linux/compat.h>
-#include <linux/seq_file.h>
-#include "aufs.h"
-
-#ifdef CONFIG_AUFS_FS_MODULE
-/* this entry violates the "one line per file" policy of sysfs */
-static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr,
- char *buf)
-{
- ssize_t err;
- static char *conf =
-/* this file is generated at compiling */
-#include "conf.str"
- ;
-
- err = snprintf(buf, PAGE_SIZE, conf);
- if (unlikely(err >= PAGE_SIZE))
- err = -EFBIG;
- return err;
-}
-
-static struct kobj_attribute au_config_attr = __ATTR_RO(config);
-#endif
-
-static struct attribute *au_attr[] = {
-#ifdef CONFIG_AUFS_FS_MODULE
- &au_config_attr.attr,
-#endif
- NULL, /* need to NULL terminate the list of attributes */
-};
-
-static struct attribute_group sysaufs_attr_group_body = {
- .attrs = au_attr
-};
-
-struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
-
-/* ---------------------------------------------------------------------- */
-
-int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
-{
- int err;
-
- SiMustAnyLock(sb);
-
- err = 0;
- if (au_opt_test(au_mntflags(sb), XINO)) {
- err = au_xino_path(seq, au_sbi(sb)->si_xib);
- seq_putc(seq, '\n');
- }
- return err;
-}
-
-/*
- * the lifetime of branch is independent from the entry under sysfs.
- * sysfs handles the lifetime of the entry, and never call ->show() after it is
- * unlinked.
- */
-static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
- aufs_bindex_t bindex, int idx)
-{
- int err;
- struct path path;
- struct dentry *root;
- struct au_branch *br;
- au_br_perm_str_t perm;
-
- AuDbg("b%d\n", bindex);
-
- err = 0;
- root = sb->s_root;
- di_read_lock_parent(root, !AuLock_IR);
- br = au_sbr(sb, bindex);
-
- switch (idx) {
- case AuBrSysfs_BR:
- path.mnt = au_br_mnt(br);
- path.dentry = au_h_dptr(root, bindex);
- au_seq_path(seq, &path);
- au_optstr_br_perm(&perm, br->br_perm);
- err = seq_printf(seq, "=%s\n", perm.a);
- break;
- case AuBrSysfs_BRID:
- err = seq_printf(seq, "%d\n", br->br_id);
- break;
- }
- di_read_unlock(root, !AuLock_IR);
- if (err == -1)
- err = -E2BIG;
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static struct seq_file *au_seq(char *p, ssize_t len)
-{
- struct seq_file *seq;
-
- seq = kzalloc(sizeof(*seq), GFP_NOFS);
- if (seq) {
- /* mutex_init(&seq.lock); */
- seq->buf = p;
- seq->size = len;
- return seq; /* success */
- }
-
- seq = ERR_PTR(-ENOMEM);
- return seq;
-}
-
-#define SysaufsBr_PREFIX "br"
-#define SysaufsBrid_PREFIX "brid"
-
-/* todo: file size may exceed PAGE_SIZE */
-ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
- char *buf)
-{
- ssize_t err;
- int idx;
- long l;
- aufs_bindex_t bend;
- struct au_sbinfo *sbinfo;
- struct super_block *sb;
- struct seq_file *seq;
- char *name;
- struct attribute **cattr;
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- sb = sbinfo->si_sb;
-
- /*
- * prevent a race condition between sysfs and aufs.
- * for instance, sysfs_file_read() calls sysfs_get_active_two() which
- * prohibits maintaining the sysfs entries.
- * hew we acquire read lock after sysfs_get_active_two().
- * on the other hand, the remount process may maintain the sysfs/aufs
- * entries after acquiring write lock.
- * it can cause a deadlock.
- * simply we gave up processing read here.
- */
- err = -EBUSY;
- if (unlikely(!si_noflush_read_trylock(sb)))
- goto out;
-
- seq = au_seq(buf, PAGE_SIZE);
- err = PTR_ERR(seq);
- if (IS_ERR(seq))
- goto out_unlock;
-
- name = (void *)attr->name;
- cattr = sysaufs_si_attrs;
- while (*cattr) {
- if (!strcmp(name, (*cattr)->name)) {
- err = container_of(*cattr, struct sysaufs_si_attr, attr)
- ->show(seq, sb);
- goto out_seq;
- }
- cattr++;
- }
-
- if (!strncmp(name, SysaufsBrid_PREFIX,
- sizeof(SysaufsBrid_PREFIX) - 1)) {
- idx = AuBrSysfs_BRID;
- name += sizeof(SysaufsBrid_PREFIX) - 1;
- } else if (!strncmp(name, SysaufsBr_PREFIX,
- sizeof(SysaufsBr_PREFIX) - 1)) {
- idx = AuBrSysfs_BR;
- name += sizeof(SysaufsBr_PREFIX) - 1;
- } else
- BUG();
-
- err = kstrtol(name, 10, &l);
- if (!err) {
- bend = au_sbend(sb);
- if (l <= bend)
- err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx);
- else
- err = -ENOENT;
- }
-
-out_seq:
- if (!err) {
- err = seq->count;
- /* sysfs limit */
- if (unlikely(err == PAGE_SIZE))
- err = -EFBIG;
- }
- kfree(seq);
-out_unlock:
- si_read_unlock(sb);
-out:
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg)
-{
- int err;
- int16_t brid;
- aufs_bindex_t bindex, bend;
- size_t sz;
- char *buf;
- struct seq_file *seq;
- struct au_branch *br;
-
- si_read_lock(sb, AuLock_FLUSH);
- bend = au_sbend(sb);
- err = bend + 1;
- if (!arg)
- goto out;
-
- err = -ENOMEM;
- buf = (void *)__get_free_page(GFP_NOFS);
- if (unlikely(!buf))
- goto out;
-
- seq = au_seq(buf, PAGE_SIZE);
- err = PTR_ERR(seq);
- if (IS_ERR(seq))
- goto out_buf;
-
- sz = sizeof(*arg) - offsetof(union aufs_brinfo, path);
- for (bindex = 0; bindex <= bend; bindex++, arg++) {
- err = !access_ok(VERIFY_WRITE, arg, sizeof(*arg));
- if (unlikely(err))
- break;
-
- br = au_sbr(sb, bindex);
- brid = br->br_id;
- BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id));
- err = __put_user(brid, &arg->id);
- if (unlikely(err))
- break;
-
- BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm));
- err = __put_user(br->br_perm, &arg->perm);
- if (unlikely(err))
- break;
-
- au_seq_path(seq, &br->br_path);
- err = seq_putc(seq, '\0');
- if (!err && seq->count <= sz) {
- err = copy_to_user(arg->path, seq->buf, seq->count);
- seq->count = 0;
- if (unlikely(err))
- break;
- } else {
- err = -E2BIG;
- goto out_seq;
- }
- }
- if (unlikely(err))
- err = -EFAULT;
-
-out_seq:
- kfree(seq);
-out_buf:
- free_page((unsigned long)buf);
-out:
- si_read_unlock(sb);
- return err;
-}
-
-long au_brinfo_ioctl(struct file *file, unsigned long arg)
-{
- return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg);
-}
-
-#ifdef CONFIG_COMPAT
-long au_brinfo_compat_ioctl(struct file *file, unsigned long arg)
-{
- return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg));
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-void sysaufs_br_init(struct au_branch *br)
-{
- int i;
- struct au_brsysfs *br_sysfs;
- struct attribute *attr;
-
- br_sysfs = br->br_sysfs;
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- attr = &br_sysfs->attr;
- sysfs_attr_init(attr);
- attr->name = br_sysfs->name;
- attr->mode = S_IRUGO;
- br_sysfs++;
- }
-}
-
-void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-{
- struct au_branch *br;
- struct kobject *kobj;
- struct au_brsysfs *br_sysfs;
- int i;
- aufs_bindex_t bend;
-
- dbgaufs_brs_del(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- br_sysfs = br->br_sysfs;
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- sysfs_remove_file(kobj, &br_sysfs->attr);
- br_sysfs++;
- }
- }
-}
-
-void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-{
- int err, i;
- aufs_bindex_t bend;
- struct kobject *kobj;
- struct au_branch *br;
- struct au_brsysfs *br_sysfs;
-
- dbgaufs_brs_add(sb, bindex);
-
- if (!sysaufs_brs)
- return;
-
- kobj = &au_sbi(sb)->si_kobj;
- bend = au_sbend(sb);
- for (; bindex <= bend; bindex++) {
- br = au_sbr(sb, bindex);
- br_sysfs = br->br_sysfs;
- snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name),
- SysaufsBr_PREFIX "%d", bindex);
- snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name),
- SysaufsBrid_PREFIX "%d", bindex);
- for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
- err = sysfs_create_file(kobj, &br_sysfs->attr);
- if (unlikely(err))
- pr_warn("failed %s under sysfs(%d)\n",
- br_sysfs->name, err);
- br_sysfs++;
- }
- }
-}
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