[Aufs 25/25] aufs debug

J. R. Okajima
2009-03-09T03:32:05Z

debug print

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
---
fs/aufs/debug.c | 406 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/debug.h | 245 +++++++++++++++++++++++++++++++++
fs/aufs/sysrq.c | 105 ++++++++++++++
3 files changed, 756 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/debug.c
create mode 100644 fs/aufs/debug.h
create mode 100644 fs/aufs/sysrq.c

diff --git a/fs/aufs/debug.c b/fs/aufs/debug.c
new file mode 100644
index 0000000..e8bc59c
--- /dev/null
+++ b/fs/aufs/debug.c
@@ -0,0 +1,406 @@
+/*
+ * Copyright (C) 2005-2009 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.
+ */
+
+/*
+ * debug print functions
+ */
+
+#include "aufs.h"
+
+atomic_t au_cond = ATOMIC_INIT(0);
+
+char *au_plevel = KERN_DEBUG;
+#define dpri(fmt, arg...) do { \
+ if (au_debug_test()) \
+ printk("%s" fmt, au_plevel, ##arg); \
+} while (0)
+
+/* ---------------------------------------------------------------------- */
+
+void au_dpri_whlist(struct au_nhash *whlist)
+{
+ int i;
+ struct hlist_head *head;
+ struct au_vdir_wh *tpos;
+ struct hlist_node *pos;
+
+ for (i = 0; i < AuSize_NHASH; i++) {
+ head = whlist->heads + i;
+ hlist_for_each_entry(tpos, pos, head, wh_hash)
+ dpri("b%d, %.*s, %d\n",
+ tpos->wh_bindex,
+ tpos->wh_str.len, tpos->wh_str.name,
+ tpos->wh_str.len);
+ }
+}
+
+void au_dpri_vdir(struct au_vdir *vdir)
+{
+ int i;
+ union au_vdir_deblk_p p;
+ unsigned char *o;
+
+ if (!vdir || IS_ERR(vdir)) {
+ dpri("err %ld\n", PTR_ERR(vdir));
+ return;
+ }
+
+ dpri("nblk %d, deblk %p, last{%d, %p}, ver %lu\n",
+ vdir->vd_nblk, vdir->vd_deblk,
+ vdir->vd_last.i, vdir->vd_last.p.p, vdir->vd_version);
+ for (i = 0; i < vdir->vd_nblk; i++) {
+ p.deblk = vdir->vd_deblk[i];
+ o = p.p;
+ dpri("[%d]: %p\n", i, o);
+ }
+}
+
+static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode,
+ struct dentry *wh)
+{
+ char *n = NULL;
+ int l = 0;
+
+ if (!inode || IS_ERR(inode)) {
+ dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
+ return -1;
+ }
+
+ /* the type of i_blocks depends upon CONFIG_LSF */
+ BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
+ && sizeof(inode->i_blocks) != sizeof(u64));
+ if (wh) {
+ n = (void *)wh->d_name.name;
+ l = wh->d_name.len;
+ }
+
+ dpri("i%d: i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
+ " ct %lld, np %lu, st 0x%lx, f 0x%x, g %x%s%.*s\n",
+ bindex,
+ inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
+ atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
+ i_size_read(inode), (unsigned long long)inode->i_blocks,
+ (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
+ inode->i_mapping ? inode->i_mapping->nrpages : 0,
+ inode->i_state, inode->i_flags, inode->i_generation,
+ l ? ", wh " : "", l, n);
+ return 0;
+}
+
+void au_dpri_inode(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bindex;
+ int err;
+
+ err = do_pri_inode(-1, inode, NULL);
+ if (err || !au_test_aufs(inode->i_sb))
+ return;
+
+ iinfo = au_ii(inode);
+ if (!iinfo)
+ return;
+ dpri("i-1: bstart %d, bend %d, gen %d\n",
+ iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode));
+ if (iinfo->ii_bstart < 0)
+ return;
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++)
+ do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode,
+ iinfo->ii_hinode[0 + bindex].hi_whdentry);
+}
+
+static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
+{
+ struct dentry *wh = NULL;
+
+ if (!dentry || IS_ERR(dentry)) {
+ dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
+ return -1;
+ }
+ /* do not call dget_parent() here */
+ dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n",
+ bindex,
+ AuDLNPair(dentry->d_parent), AuDLNPair(dentry),
+ dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
+ atomic_read(&dentry->d_count), dentry->d_flags);
+ if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) {
+ struct au_iinfo *iinfo = au_ii(dentry->d_inode);
+ if (iinfo)
+ wh = iinfo->ii_hinode[0 + bindex].hi_whdentry;
+ }
+ do_pri_inode(bindex, dentry->d_inode, wh);
+ return 0;
+}
+
+void au_dpri_dentry(struct dentry *dentry)
+{
+ struct au_dinfo *dinfo;
+ aufs_bindex_t bindex;
+ int err;
+
+ err = do_pri_dentry(-1, dentry);
+ if (err || !au_test_aufs(dentry->d_sb))
+ return;
+
+ dinfo = au_di(dentry);
+ if (!dinfo)
+ return;
+ dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n",
+ dinfo->di_bstart, dinfo->di_bend,
+ dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry));
+ if (dinfo->di_bstart < 0)
+ return;
+ for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
+ do_pri_dentry(bindex, dinfo->di_hdentry[0 + bindex].hd_dentry);
+}
+
+static int do_pri_file(aufs_bindex_t bindex, struct file *file)
+{
+ char a[32];
+
+ if (!file || IS_ERR(file)) {
+ dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
+ return -1;
+ }
+ a[0] = 0;
+ if (bindex < 0
+ && file->f_dentry
+ && au_test_aufs(file->f_dentry->d_sb)
+ && au_fi(file))
+ snprintf(a, sizeof(a), ", mmapped %d", au_test_mmapped(file));
+ dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, pos %llu%s\n",
+ bindex, file->f_mode, file->f_flags, (long)file_count(file),
+ file->f_pos, a);
+ if (file->f_dentry)
+ do_pri_dentry(bindex, file->f_dentry);
+ return 0;
+}
+
+void au_dpri_file(struct file *file)
+{
+ struct au_finfo *finfo;
+ aufs_bindex_t bindex;
+ int err;
+
+ err = do_pri_file(-1, file);
+ if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb))
+ return;
+
+ finfo = au_fi(file);
+ if (!finfo)
+ return;
+ if (finfo->fi_bstart < 0)
+ return;
+ for (bindex = finfo->fi_bstart; bindex <= finfo->fi_bend; bindex++) {
+ struct au_hfile *hf;
+
+ hf = finfo->fi_hfile + bindex;
+ do_pri_file(bindex, hf ? hf->hf_file : NULL);
+ }
+}
+
+static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
+{
+ struct vfsmount *mnt;
+ struct super_block *sb;
+
+ if (!br || IS_ERR(br)
+ || !(mnt = br->br_mnt) || IS_ERR(mnt)
+ || !(sb = mnt->mnt_sb) || IS_ERR(sb)) {
+ dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
+ return -1;
+ }
+
+ dpri("s%d: {perm 0x%x, cnt %d, wbr %p}, "
+ "%s, dev 0x%02x%02x, flags 0x%lx, cnt(BIAS) %d, active %d, "
+ "xino %d\n",
+ bindex, br->br_perm, atomic_read(&br->br_count), br->br_wbr,
+ au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
+ sb->s_flags, sb->s_count - S_BIAS,
+ atomic_read(&sb->s_active), !!br->br_xino.xi_file);
+ return 0;
+}
+
+void au_dpri_sb(struct super_block *sb)
+{
+ struct au_sbinfo *sbinfo;
+ aufs_bindex_t bindex;
+ int err;
+ /* to reuduce stack size */
+ struct {
+ struct vfsmount mnt;
+ struct au_branch fake;
+ } *a;
+
+ /* this function can be called from magic sysrq */
+ a = kzalloc(sizeof(*a), GFP_ATOMIC);
+ if (unlikely(!a)) {
+ dpri("no memory\n");
+ return;
+ }
+
+ a->mnt.mnt_sb = sb;
+ a->fake.br_perm = 0;
+ a->fake.br_mnt = &a->mnt;
+ a->fake.br_xino.xi_file = NULL;
+ atomic_set(&a->fake.br_count, 0);
+ smp_mb(); /* atomic_set */
+ err = do_pri_br(-1, &a->fake);
+ kfree(a);
+ dpri("dev 0x%x\n", sb->s_dev);
+ if (err || !au_test_aufs(sb))
+ return;
+
+ sbinfo = au_sbi(sb);
+ if (!sbinfo)
+ return;
+ dpri("nw %d, gen %u, kobj %d\n",
+ atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
+ atomic_read(&sbinfo->si_kobj.kref.refcount));
+ for (bindex = 0; bindex <= sbinfo->si_bend; bindex++)
+ do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_dbg_sleep_jiffy(int jiffy)
+{
+ while (jiffy)
+ jiffy = schedule_timeout_uninterruptible(jiffy);
+}
+
+void au_dbg_iattr(struct iattr *ia)
+{
+#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \
+ dpri(#name "\n")
+ AuBit(MODE);
+ AuBit(UID);
+ AuBit(GID);
+ AuBit(SIZE);
+ AuBit(ATIME);
+ AuBit(MTIME);
+ AuBit(CTIME);
+ AuBit(ATIME_SET);
+ AuBit(MTIME_SET);
+ AuBit(FORCE);
+ AuBit(ATTR_FLAG);
+ AuBit(KILL_SUID);
+ AuBit(KILL_SGID);
+ AuBit(FILE);
+ AuBit(KILL_PRIV);
+ AuBit(OPEN);
+ AuBit(TIMES_SET);
+#undef AuBit
+ dpri("ia_file %p\n", ia->ia_file);
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen)
+{
+ struct dentry *parent;
+
+ parent = dget_parent(dentry);
+ AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)
+ || IS_ROOT(dentry)
+ || au_digen(parent) != sigen);
+ dput(parent);
+}
+
+void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen)
+{
+ struct dentry *parent;
+
+ parent = dget_parent(dentry);
+ AuDebugOn(S_ISDIR(dentry->d_inode->i_mode)
+ || au_digen(parent) != sigen);
+ dput(parent);
+}
+
+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
+{
+ int err, i, j;
+ struct au_dcsub_pages dpages;
+ struct au_dpage *dpage;
+ struct dentry **dentries;
+
+ err = au_dpages_init(&dpages, GFP_NOFS);
+ AuDebugOn(err);
+ err = au_dcsub_pages_rev(&dpages, parent, /*do_include*/1, NULL, NULL);
+ AuDebugOn(err);
+ for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
+ dpage = dpages.dpages + i;
+ dentries = dpage->dentries;
+ for (j = dpage->ndentry - 1; !err && j >= 0; j--)
+ AuDebugOn(au_digen(dentries[j]) != sigen);
+ }
+ au_dpages_free(&dpages);
+}
+
+void au_dbg_verify_hf(struct au_finfo *finfo)
+{
+ struct au_hfile *hf;
+ aufs_bindex_t bend, bindex;
+
+ if (finfo->fi_bstart >= 0) {
+ bend = finfo->fi_bend;
+ for (bindex = finfo->fi_bstart; bindex <= bend; bindex++) {
+ hf = finfo->fi_hfile + bindex;
+ AuDebugOn(hf->hf_file || hf->hf_br);
+ }
+ }
+}
+
+void au_dbg_verify_kthread(void)
+{
+ if (au_test_wkq(current)) {
+ au_dbg_blocked();
+ BUG();
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused)
+{
+#ifdef AuForceNoPlink
+ au_opt_clr(sbinfo->si_mntflags, PLINK);
+#endif
+#ifdef AuForceNoXino
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+#endif
+#ifdef AuForceNoRefrof
+ au_opt_clr(sbinfo->si_mntflags, REFROF);
+#endif
+#ifdef AuForceHinotify
+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_HINOTIFY);
+#endif
+}
+
+int __init au_debug_init(void)
+{
+ aufs_bindex_t bindex;
+ struct au_vdir_destr destr;
+
+ bindex = -1;
+ AuDebugOn(bindex >= 0);
+
+ destr.len = -1;
+ AuDebugOn(destr.len < NAME_MAX);
+
+#ifdef CONFIG_4KSTACKS
+ AuWarn("CONFIG_4KSTACKS is defined.\n");
+#endif
+
+#ifdef AuForceNoBrs
+ sysaufs_brs = 0;
+#endif
+
+ return 0;
+}
diff --git a/fs/aufs/debug.h b/fs/aufs/debug.h
new file mode 100644
index 0000000..0b377a8
--- /dev/null
+++ b/fs/aufs/debug.h
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2005-2009 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.
+ */
+
+/*
+ * debug print functions
+ */
+
+#ifndef __AUFS_DEBUG_H__
+#define __AUFS_DEBUG_H__
+
+#ifdef __KERNEL__
+
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/kd.h>
+#include <linux/vt_kern.h>
+#include <linux/sysrq.h>
+#include <linux/aufs_type.h>
+
+#ifdef CONFIG_AUFS_DEBUG
+#define AuDebugOn(a) BUG_ON(a)
+extern atomic_t au_cond;
+static inline void au_debug(int n)
+{
+ atomic_set(&au_cond, n);
+ smp_mb();
+}
+
+static inline int au_debug_test(void)
+{
+ int ret;
+
+ ret = atomic_read(&au_cond);
+ smp_mb();
+ return ret;
+}
+#else
+#define AuDebugOn(a) do {} while (0)
+#define au_debug() do {} while (0)
+static inline int au_debug_test(void)
+{
+ return 0;
+}
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* ---------------------------------------------------------------------- */
+
+/* debug print */
+
+#define AuDpri(lvl, fmt, arg...) \
+ printk(lvl AUFS_NAME " %s:%d:%s[%d]: " fmt, \
+ __func__, __LINE__, current->comm, current->pid, ##arg)
+#define AuDbg(fmt, arg...) do { \
+ if (au_debug_test()) \
+ AuDpri(KERN_DEBUG, fmt, ##arg); \
+} while (0)
+#define AuLabel(l) AuDbg(#l "\n")
+#define AuInfo(fmt, arg...) AuDpri(KERN_INFO, fmt, ##arg)
+#define AuWarn(fmt, arg...) AuDpri(KERN_WARNING, fmt, ##arg)
+#define AuErr(fmt, arg...) AuDpri(KERN_ERR, fmt, ##arg)
+#define AuIOErr(fmt, arg...) AuErr("I/O Error, " fmt, ##arg)
+#define AuWarn1(fmt, arg...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ AuWarn(fmt, ##arg); \
+} while (0)
+
+#define AuErr1(fmt, arg...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ AuErr(fmt, ##arg); \
+} while (0)
+
+#define AuIOErr1(fmt, arg...) do { \
+ static unsigned char _c; \
+ if (!_c++) \
+ AuIOErr(fmt, ##arg); \
+} while (0)
+
+#define AuUnsupportMsg "This operation is not supported." \
+ " Please report this application to aufs-users ML."
+#define AuUnsupport(fmt, args...) do { \
+ AuErr(AuUnsupportMsg "\n" fmt, ##args); \
+ dump_stack(); \
+} while (0)
+
+#define AuTraceErr(e) do { \
+ if (unlikely((e) < 0)) \
+ AuDbg("err %d\n", (int)(e)); \
+} while (0)
+
+#define AuTraceErrPtr(p) do { \
+ if (IS_ERR(p)) \
+ AuDbg("err %ld\n", PTR_ERR(p)); \
+} while (0)
+
+/* dirty macros for debug print, use with "%.*s" and caution */
+#define AuLNPair(qstr) (qstr)->len, (qstr)->name
+#define AuDLNPair(d) AuLNPair(&(d)->d_name)
+
+/* ---------------------------------------------------------------------- */
+
+struct au_sbinfo;
+struct au_finfo;
+#ifdef CONFIG_AUFS_DEBUG
+extern char *au_plevel;
+struct au_nhash;
+void au_dpri_whlist(struct au_nhash *whlist);
+struct au_vdir;
+void au_dpri_vdir(struct au_vdir *vdir);
+void au_dpri_inode(struct inode *inode);
+void au_dpri_dentry(struct dentry *dentry);
+void au_dpri_file(struct file *filp);
+void au_dpri_sb(struct super_block *sb);
+
+void au_dbg_sleep_jiffy(int jiffy);
+void au_dbg_iattr(struct iattr *ia);
+
+void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen);
+void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen);
+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
+void au_dbg_verify_hf(struct au_finfo *finfo);
+void au_dbg_verify_kthread(void);
+
+int __init au_debug_init(void);
+void au_debug_sbinfo_init(struct au_sbinfo *sbinfo);
+#define AuDbgWhlist(w) do { \
+ AuDbg(#w "\n"); \
+ au_dpri_whlist(w); \
+} while (0)
+
+#define AuDbgVdir(v) do { \
+ AuDbg(#v "\n"); \
+ au_dpri_vdir(v); \
+} while (0)
+
+#define AuDbgInode(i) do { \
+ AuDbg(#i "\n"); \
+ au_dpri_inode(i); \
+} while (0)
+
+#define AuDbgDentry(d) do { \
+ AuDbg(#d "\n"); \
+ au_dpri_dentry(d); \
+} while (0)
+
+#define AuDbgFile(f) do { \
+ AuDbg(#f "\n"); \
+ au_dpri_file(f); \
+} while (0)
+
+#define AuDbgSb(sb) do { \
+ AuDbg(#sb "\n"); \
+ au_dpri_sb(sb); \
+} while (0)
+
+#define AuDbgSleep(sec) do { \
+ AuDbg("sleep %d sec\n", sec); \
+ ssleep(sec); \
+} while (0)
+
+#define AuDbgSleepJiffy(jiffy) do { \
+ AuDbg("sleep %d jiffies\n", jiffy); \
+ au_dbg_sleep_jiffy(jiffy); \
+} while (0)
+
+#define AuDbgIAttr(ia) do { \
+ AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \
+ au_dbg_iattr(ia); \
+} while (0)
+#else
+static inline void au_dbg_verify_dir_parent(struct dentry *dentry,
+ unsigned int sigen)
+{
+ /* empty */
+}
+static inline void au_dbg_verify_nondir_parent(struct dentry *dentry,
+ unsigned int sigen)
+{
+ /* empty */
+}
+static inline void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
+{
+ /* empty */
+}
+static inline void au_dbg_verify_hf(struct au_finfo *finfo)
+{
+ /* empty */
+}
+static inline void au_dbg_verify_kthread(void)
+{
+ /* empty */
+}
+
+static inline int au_debug_init(void)
+{
+ return 0;
+}
+static inline void au_debug_sbinfo_init(struct au_sbinfo *sbinfo)
+{
+ /* empty */
+}
+#define AuDbgWhlist(w) do {} while (0)
+#define AuDbgVdir(v) do {} while (0)
+#define AuDbgInode(i) do {} while (0)
+#define AuDbgDentry(d) do {} while (0)
+#define AuDbgFile(f) do {} while (0)
+#define AuDbgSb(sb) do {} while (0)
+#define AuDbgSleep(sec) do {} while (0)
+#define AuDbgSleepJiffy(jiffy) do {} while (0)
+#define AuDbgIAttr(ia) do {} while (0)
+#endif /* CONFIG_AUFS_DEBUG */
+
+/* ---------------------------------------------------------------------- */
+
+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
+int __init au_sysrq_init(void);
+void au_sysrq_fin(void);
+
+#ifdef CONFIG_HW_CONSOLE
+#define au_dbg_blocked() do { \
+ WARN_ON(1); \
+ handle_sysrq('w', vc_cons[fg_console].d->vc_tty); \
+} while (0)
+#else
+#define au_dbg_blocked() do {} while (0)
+#endif
+
+#else
+static inline int au_sysrq_init(void)
+{
+ return 0;
+}
+#define au_sysrq_fin() do {} while (0)
+#define au_dbg_blocked() do {} while (0)
+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_DEBUG_H__ */
diff --git a/fs/aufs/sysrq.c b/fs/aufs/sysrq.c
new file mode 100644
index 0000000..afec3af
--- /dev/null
+++ b/fs/aufs/sysrq.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2005-2009 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.
+ */
+
+/*
+ * magic sysrq hanlder
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+/* #include <linux/sysrq.h> */
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+static void sysrq_sb(struct super_block *sb)
+{
+ char *plevel;
+ struct au_sbinfo *sbinfo;
+ struct file *file;
+
+ plevel = au_plevel;
+ au_plevel = KERN_WARNING;
+ au_debug(1);
+
+ sbinfo = au_sbi(sb);
+ pr_warning("si=%lx\n", sysaufs_si_id(sbinfo));
+ pr_warning(AUFS_NAME ": superblock\n");
+ au_dpri_sb(sb);
+ pr_warning(AUFS_NAME ": root dentry\n");
+ au_dpri_dentry(sb->s_root);
+ pr_warning(AUFS_NAME ": root inode\n");
+ au_dpri_inode(sb->s_root->d_inode);
+#if 0
+ struct inode *i;
+ pr_warning(AUFS_NAME ": isolated inode\n");
+ list_for_each_entry(i, &sb->s_inodes, i_sb_list)
+ if (list_empty(&i->i_dentry))
+ au_dpri_inode(i);
+#endif
+ pr_warning(AUFS_NAME ": files\n");
+ list_for_each_entry(file, &sb->s_files, f_u.fu_list)
+ if (!special_file(file->f_dentry->d_inode->i_mode))
+ au_dpri_file(file);
+
+ au_plevel = plevel;
+ au_debug(0);
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* module parameter */
+static char *aufs_sysrq_key = "a";
+module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
+MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
+
+static void au_sysrq(int key, struct tty_struct *tty)
+{
+ struct kobject *kobj;
+ struct au_sbinfo *sbinfo;
+
+ /* spin_lock(&sysaufs_ket->list_lock); */
+ list_for_each_entry(kobj, &sysaufs_ket->list, entry) {
+ sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
+ sysrq_sb(sbinfo->si_sb);
+ }
+ /* spin_unlock(&sysaufs_ket->list_lock); */
+}
+
+static struct sysrq_key_op au_sysrq_op = {
+ .handler = au_sysrq,
+ .help_msg = "Aufs",
+ .action_msg = "Aufs",
+ .enable_mask = SYSRQ_ENABLE_DUMP
+};
+
+/* ---------------------------------------------------------------------- */
+
+int __init au_sysrq_init(void)
+{
+ int err;
+ char key;
+
+ err = -1;
+ key = *aufs_sysrq_key;
+ if ('a' <= key && key <= 'z')
+ err = register_sysrq_key(key, &au_sysrq_op);
+ if (unlikely(err))
+ AuErr("err %d, sysrq=%c\n", err, key);
+ return err;
+}
+
+void au_sysrq_fin(void)
+{
+ int err;
+ err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
+ if (unlikely(err))
+ AuErr("err %d (ignored)\n", err);
+}
--
1.6.1.284.g5dc13