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Subject[AUFS PATCH v2.6.26-rc2-mm1 24/39] aufs inode
Date
From: Junjiro Okajima <hooanon05@yahoo.co.jp>

initial commit
inode functions and private data

Signed-off-by: Junjiro Okajima <hooanon05@yahoo.co.jp>
---
fs/aufs/iinfo.c | 275 ++++++++++++++++++++++++++++++++++++++
fs/aufs/inode.c | 400 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/inode.h | 334 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1009 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/iinfo.c
create mode 100644 fs/aufs/inode.c
create mode 100644 fs/aufs/inode.h
diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c
new file mode 100644
index 0000000..f9230a9
--- /dev/null
+++ b/fs/aufs/iinfo.c
@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode private data
+ */
+
+#include "aufs.h"
+
+struct au_iinfo *au_ii(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+
+ iinfo = &(container_of(inode, struct aufs_icntnr, vfs_inode)->iinfo);
+ /* bad_inode case */
+ if (unlikely(!iinfo->ii_hinode))
+ return NULL;
+ AuDebugOn(!iinfo->ii_hinode
+ /* || au_sbi(inode->i_sb)->si_bend < iinfo->ii_bend */
+ || iinfo->ii_bend < iinfo->ii_bstart);
+ return iinfo;
+}
+
+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct inode *hidden_inode;
+
+ IiMustAnyLock(inode);
+ AuDebugOn(bindex < 0 || au_ibend(inode) < bindex);
+ hidden_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
+ AuDebugOn(hidden_inode && atomic_read(&hidden_inode->i_count) <= 0);
+ return hidden_inode;
+}
+
+aufs_bindex_t au_ii_br_id(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustAnyLock(inode);
+ AuDebugOn(bindex < 0
+ || au_ibend(inode) < bindex
+ || !au_ii(inode)->ii_hinode[0 + bindex].hi_inode);
+ return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
+}
+
+/* todo: hard/soft set? */
+void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct au_iinfo *iinfo = au_ii(inode);
+ struct inode *h_inode;
+
+ IiMustWriteLock(inode);
+ AuDebugOn(au_sbend(inode->i_sb) < bindex);
+ iinfo->ii_bstart = bindex;
+ h_inode = iinfo->ii_hinode[bindex + 0].hi_inode;
+ if (h_inode)
+ au_cpup_igen(inode, h_inode);
+}
+
+unsigned int au_hi_flags(struct inode *inode, int isdir)
+{
+ unsigned int flags;
+ const unsigned int mnt_flags = au_mntflags(inode->i_sb);
+
+ flags = 0;
+ if (au_opt_test(mnt_flags, XINO))
+ au_fset_hi(flags, XINO);
+ if (unlikely(isdir && au_opt_test(mnt_flags, UDBA_INOTIFY)))
+ au_fset_hi(flags, NOTIFY);
+ return flags;
+}
+
+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode, unsigned int flags)
+{
+ struct au_hinode *hinode;
+ struct inode *hi;
+ struct au_iinfo *iinfo = au_ii(inode);
+
+ LKTRTrace("i%lu, b%d, hi%lu, flags 0x%x\n",
+ inode->i_ino, bindex, h_inode ? h_inode->i_ino : 0, flags);
+ IiMustWriteLock(inode);
+ hinode = iinfo->ii_hinode + bindex;
+ hi = hinode->hi_inode;
+ AuDebugOn(bindex < au_ibstart(inode) || au_ibend(inode) < bindex
+ || (h_inode && atomic_read(&h_inode->i_count) <= 0)
+ || (h_inode && hi));
+
+ if (hi)
+ au_hiput(hinode);
+ hinode->hi_inode = h_inode;
+ if (h_inode) {
+ int err;
+ struct super_block *sb = inode->i_sb;
+
+ if (bindex == iinfo->ii_bstart)
+ au_cpup_igen(inode, h_inode);
+ hinode->hi_id = au_sbr_id(sb, bindex);
+ if (au_ftest_hi(flags, XINO)) {
+ struct au_xino_entry xinoe = {
+ .ino = inode->i_ino,
+ /* .h_gen = h_inode->i_generation */
+ };
+ err = au_xino_write(sb, bindex, h_inode->i_ino, &xinoe);
+ if (unlikely(err))
+ AuIOErr1("failed au_xino_write() %d\n", err);
+ }
+
+ if (unlikely(au_ftest_hi(flags, NOTIFY)
+ && au_br_hinotifyable(au_sbr_perm(sb, bindex)))) {
+ err = au_hin_alloc(hinode, inode, h_inode);
+ if (unlikely(err))
+ AuIOErr1("au_hin_alloc() %d\n", err);
+ }
+ }
+}
+
+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_wh)
+{
+ struct au_hinode *hinode;
+
+ IiMustWriteLock(inode);
+ hinode = au_ii(inode)->ii_hinode + bindex;
+ AuDebugOn(hinode->hi_whdentry);
+ hinode->hi_whdentry = h_wh;
+}
+
+void au_update_iigen(struct inode *inode)
+{
+ AuDebugOn(!inode->i_sb);
+ atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb));
+ /* smp_mb(); */ /* atomic_set */
+}
+
+/* it may be called at remount time, too */
+void au_update_brange(struct inode *inode, int do_put_zero)
+{
+ struct au_iinfo *iinfo;
+
+ LKTRTrace("i%lu, %d\n", inode->i_ino, do_put_zero);
+ IiMustWriteLock(inode);
+
+ iinfo = au_ii(inode);
+ if (unlikely(!iinfo) || iinfo->ii_bstart < 0)
+ return;
+
+ if (do_put_zero) {
+ aufs_bindex_t bindex;
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+ bindex++) {
+ struct inode *h_i;
+ h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
+ if (h_i && !h_i->i_nlink)
+ au_set_h_iptr(inode, bindex, NULL, 0);
+ }
+ }
+
+ iinfo->ii_bstart = -1;
+ while (++iinfo->ii_bstart <= iinfo->ii_bend)
+ if (iinfo->ii_hinode[0 + iinfo->ii_bstart].hi_inode)
+ break;
+ if (iinfo->ii_bstart > iinfo->ii_bend) {
+ iinfo->ii_bstart = -1;
+ iinfo->ii_bend = -1;
+ return;
+ }
+
+ iinfo->ii_bend++;
+ while (0 <= --iinfo->ii_bend)
+ if (iinfo->ii_hinode[0 + iinfo->ii_bend].hi_inode)
+ break;
+ AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend || iinfo->ii_bend < 0);
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_iinfo_init(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ struct super_block *sb;
+ int nbr, i;
+
+ sb = inode->i_sb;
+ AuDebugOn(!sb);
+ iinfo = &(container_of(inode, struct aufs_icntnr, vfs_inode)->iinfo);
+ AuDebugOn(iinfo->ii_hinode);
+ nbr = au_sbend(sb) + 1;
+ if (unlikely(nbr <= 0))
+ nbr = 1;
+ iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_KERNEL);
+ if (iinfo->ii_hinode) {
+ for (i = 0; i < nbr; i++)
+ iinfo->ii_hinode[i].hi_id = -1;
+ atomic_set(&iinfo->ii_generation, au_sigen(sb));
+ /* smp_mb(); */ /* atomic_set */
+ au_rw_init_nolock(&iinfo->ii_rwsem);
+ iinfo->ii_bstart = -1;
+ iinfo->ii_bend = -1;
+ iinfo->ii_vdir = NULL;
+ return 0;
+ }
+ return -ENOMEM;
+}
+
+static int au_iinfo_write0(struct super_block *sb, struct au_hinode *hinode,
+ ino_t ino)
+{
+ int err, locked;
+ aufs_bindex_t bindex;
+
+ err = 0;
+ locked = si_read_trylock(sb, !AuLock_FLUSH); /* crucio! */
+ bindex = au_br_index(sb, hinode->hi_id);
+ if (bindex >= 0)
+ err = au_xino_write0(sb, bindex, hinode->hi_inode->i_ino, ino);
+ /* error action? */
+ if (locked)
+ si_read_unlock(sb);
+ return err;
+}
+
+void au_iinfo_fin(struct inode *inode)
+{
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bend;
+ struct au_hinode *hi;
+ struct super_block *sb;
+ int unlinked;
+ ino_t ino;
+
+ iinfo = au_ii(inode);
+ /* bad_inode case */
+ if (unlikely(!iinfo))
+ return;
+
+ if (unlikely(iinfo->ii_vdir))
+ au_vdir_free(iinfo->ii_vdir);
+
+ if (iinfo->ii_bstart >= 0) {
+ sb = inode->i_sb;
+ unlinked = !inode->i_nlink;
+ ino = 0;
+ if (unlinked)
+ ino = inode->i_ino;
+ hi = iinfo->ii_hinode + iinfo->ii_bstart;
+ bend = iinfo->ii_bend;
+ while (iinfo->ii_bstart++ <= bend) {
+ if (hi->hi_inode) {
+ if (unlinked || !hi->hi_inode->i_nlink) {
+ au_iinfo_write0(sb, hi, ino);
+ /* ignore this error */
+ ino = 0;
+ }
+ au_hiput(hi);
+ }
+ hi++;
+ }
+ }
+
+ kfree(iinfo->ii_hinode);
+}
diff --git a/fs/aufs/inode.c b/fs/aufs/inode.c
new file mode 100644
index 0000000..f7f9150
--- /dev/null
+++ b/fs/aufs/inode.c
@@ -0,0 +1,400 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode functions
+ */
+
+#include "aufs.h"
+
+int au_refresh_hinode_self(struct inode *inode)
+{
+ int err, new_sz, update;
+ struct inode *first;
+ struct au_hinode *p, *q, tmp;
+ struct super_block *sb;
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bindex, bend, new_bindex;
+
+ LKTRTrace("i%lu\n", inode->i_ino);
+ IiMustWriteLock(inode);
+
+ err = -ENOMEM;
+ update = 0;
+ sb = inode->i_sb;
+ bend = au_sbend(sb);
+ new_sz = sizeof(*iinfo->ii_hinode) * (bend + 1);
+ iinfo = au_ii(inode);
+ p = au_kzrealloc(iinfo->ii_hinode, sizeof(*p) * (iinfo->ii_bend + 1),
+ new_sz, GFP_KERNEL);
+ if (unlikely(!p))
+ goto out;
+
+ iinfo->ii_hinode = p;
+ p = iinfo->ii_hinode + iinfo->ii_bstart;
+ first = p->hi_inode;
+ err = 0;
+ for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
+ bindex++, p++) {
+ if (!p->hi_inode)
+ continue;
+
+ new_bindex = au_br_index(sb, p->hi_id);
+ if (new_bindex == bindex)
+ continue;
+ if (new_bindex < 0) {
+ update++;
+ au_hiput(p);
+ p->hi_inode = NULL;
+ continue;
+ }
+
+ if (new_bindex < iinfo->ii_bstart)
+ iinfo->ii_bstart = new_bindex;
+ if (iinfo->ii_bend < new_bindex)
+ iinfo->ii_bend = new_bindex;
+ /* swap two hidden inode, and loop again */
+ q = iinfo->ii_hinode + new_bindex;
+ tmp = *q;
+ *q = *p;
+ *p = tmp;
+ if (tmp.hi_inode) {
+ bindex--;
+ p--;
+ }
+ }
+ au_update_brange(inode, /*do_put_zero*/0);
+
+ if (unlikely(err))
+ goto out;
+
+ if (1 || first != au_h_iptr(inode, iinfo->ii_bstart))
+ au_cpup_attr_all(inode);
+ if (update && S_ISDIR(inode->i_mode))
+ inode->i_version++;
+ au_update_iigen(inode);
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
+{
+ int err, update, isdir;
+ struct inode *first;
+ struct au_hinode *p;
+ struct super_block *sb;
+ struct au_iinfo *iinfo;
+ aufs_bindex_t bindex, bend;
+ unsigned int flags;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+ IiMustWriteLock(inode);
+
+ err = au_refresh_hinode_self(inode);
+ if (unlikely(err))
+ goto out;
+
+ sb = dentry->d_sb;
+ bend = au_sbend(sb);
+ iinfo = au_ii(inode);
+ update = 0;
+ p = iinfo->ii_hinode + iinfo->ii_bstart;
+ first = p->hi_inode;
+ isdir = S_ISDIR(inode->i_mode);
+ flags = au_hi_flags(inode, isdir);
+ bend = au_dbend(dentry);
+ for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
+ struct inode *hi;
+ struct dentry *hd;
+
+ hd = au_h_dptr(dentry, bindex);
+ if (!hd || !hd->d_inode)
+ continue;
+
+ if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
+ hi = au_h_iptr(inode, bindex);
+ if (hi) {
+ if (hi == hd->d_inode)
+ continue;
+ err = -ESTALE;
+ break;
+ }
+ }
+ if (bindex < iinfo->ii_bstart)
+ iinfo->ii_bstart = bindex;
+ if (iinfo->ii_bend < bindex)
+ iinfo->ii_bend = bindex;
+ au_set_h_iptr(inode, bindex, igrab(hd->d_inode), flags);
+ update++;
+ }
+ au_update_brange(inode, /*do_put_zero*/0);
+
+ if (unlikely(err))
+ goto out;
+
+ if (1 || first != au_h_iptr(inode, iinfo->ii_bstart))
+ au_cpup_attr_all(inode);
+ if (update && isdir)
+ inode->i_version++;
+ au_update_iigen(inode);
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+static int set_inode(struct inode *inode, struct dentry *dentry)
+{
+ int err, isdir;
+ struct dentry *h_dentry;
+ struct inode *h_inode;
+ umode_t mode;
+ aufs_bindex_t bindex, bstart, btail;
+ struct au_iinfo *iinfo;
+ unsigned int flags;
+
+ LKTRTrace("i%lu, %.*s\n", inode->i_ino, AuDLNPair(dentry));
+ AuDebugOn(!(inode->i_state & I_NEW));
+ IiMustWriteLock(inode);
+ bstart = au_dbstart(dentry);
+ h_dentry = au_h_dptr(dentry, bstart);
+ AuDebugOn(!h_dentry);
+ h_inode = h_dentry->d_inode;
+ AuDebugOn(!h_inode);
+
+ err = 0;
+ isdir = 0;
+ mode = h_inode->i_mode;
+ switch (mode & S_IFMT) {
+ case S_IFREG:
+ btail = au_dbtail(dentry);
+ break;
+ case S_IFDIR:
+ isdir = 1;
+ btail = au_dbtaildir(dentry);
+ inode->i_op = &aufs_dir_iop;
+ inode->i_fop = &aufs_dir_fop;
+ break;
+ case S_IFLNK:
+ btail = au_dbtail(dentry);
+ inode->i_op = &aufs_symlink_iop;
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ case S_IFSOCK:
+ btail = au_dbtail(dentry);
+ init_special_inode(inode, mode,
+ au_h_rdev(h_inode, /*h_mnt*/NULL, h_dentry));
+ break;
+ default:
+ AuIOErr("Unknown file type 0%o\n", mode);
+ err = -EIO;
+ goto out;
+ }
+
+ flags = au_hi_flags(inode, isdir);
+ iinfo = au_ii(inode);
+ iinfo->ii_bstart = bstart;
+ iinfo->ii_bend = btail;
+ for (bindex = bstart; bindex <= btail; bindex++) {
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (!h_dentry)
+ continue;
+ AuDebugOn(!h_dentry->d_inode);
+ au_set_h_iptr(inode, bindex, igrab(h_dentry->d_inode), flags);
+ }
+ au_cpup_attr_all(inode);
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* successful returns with iinfo write_locked */
+/* todo: return with unlocked? */
+static int reval_inode(struct inode *inode, struct dentry *dentry, int *matched)
+{
+ int err;
+ struct inode *h_inode, *h_dinode;
+ aufs_bindex_t bindex, bend;
+
+ LKTRTrace("i%lu, %.*s\n", inode->i_ino, AuDLNPair(dentry));
+
+ *matched = 0;
+
+ /*
+ * before this function, if aufs got any iinfo lock, it must be only
+ * one, the parent dir.
+ * it can happen by UDBA and the obsoleted inode number.
+ */
+ err = -EIO;
+ if (unlikely(inode->i_ino == parent_ino(dentry)))
+ goto out;
+
+ err = 0;
+ h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
+ mutex_lock_nested(&inode->i_mutex, AuLsc_I_CHILD);
+ ii_write_lock_new(inode);
+ bend = au_ibend(inode);
+ for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
+ h_inode = au_h_iptr(inode, bindex);
+ if (h_inode && h_inode == h_dinode) {
+ /* && (ibs != bstart
+ || !au_test_higen(inode, h_inode))); */
+ *matched = 1;
+ err = 0;
+ if (unlikely(au_iigen(inode) != au_digen(dentry)))
+ err = au_refresh_hinode(inode, dentry);
+ break;
+ }
+ }
+ if (unlikely(err))
+ ii_write_unlock(inode);
+ mutex_unlock(&inode->i_mutex);
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* successful returns with iinfo write_locked */
+/* todo: return with unlocked? */
+struct inode *au_new_inode(struct dentry *dentry)
+{
+ struct inode *inode, *h_inode;
+ struct dentry *h_dentry;
+ ino_t h_ino;
+ struct super_block *sb;
+ int err, match;
+ aufs_bindex_t bstart;
+ struct au_xino_entry xinoe;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+ sb = dentry->d_sb;
+ bstart = au_dbstart(dentry);
+ h_dentry = au_h_dptr(dentry, bstart);
+ AuDebugOn(!h_dentry);
+ h_inode = h_dentry->d_inode;
+ AuDebugOn(!h_inode);
+
+ h_ino = h_inode->i_ino;
+ err = au_xino_read(sb, bstart, h_ino, &xinoe);
+ inode = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+ new_ino:
+ if (!xinoe.ino) {
+ xinoe.ino = au_xino_new_ino(sb);
+ if (!xinoe.ino) {
+ inode = ERR_PTR(-EIO);
+ goto out;
+ }
+ }
+
+ LKTRTrace("i%lu\n", xinoe.ino);
+ inode = au_iget_locked(sb, xinoe.ino);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out;
+
+ LKTRTrace("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
+ if (inode->i_state & I_NEW) {
+ ii_write_lock_new(inode);
+ err = set_inode(inode, dentry);
+ unlock_new_inode(inode);
+ if (!err)
+ goto out; /* success */
+ iget_failed(inode);
+ ii_write_unlock(inode);
+ goto out_iput;
+ } else {
+ AuDebugOn(inode->i_state & I_LOCK);
+ err = reval_inode(inode, dentry, &match);
+ if (!err)
+ goto out; /* success */
+ else if (match)
+ goto out_iput;
+ }
+
+ if (unlikely(au_test_unique_ino(h_dentry, h_ino)))
+ AuWarn1("Un-notified UDBA or repeatedly renamed dir,"
+ " b%d, %s, %.*s, hi%lu, i%lu.\n",
+ bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry),
+ h_ino, xinoe.ino);
+ xinoe.ino = 0;
+ err = au_xino_write0(sb, bstart, h_ino, 0);
+ if (!err) {
+ iput(inode);
+ goto new_ino;
+ }
+ /* force noxino? */
+
+ out_iput:
+ iput(inode);
+ inode = ERR_PTR(err);
+ out:
+ AuTraceErrPtr(inode);
+ return inode;
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode)
+{
+ int err;
+
+ err = au_br_rdonly(au_sbr(sb, bindex));
+
+ /* pseudo-link after flushed may out of bounds */
+ if (!err
+ && inode
+ && au_ibstart(inode) <= bindex
+ && bindex <= au_ibend(inode)) {
+ /*
+ * permission check is unnecessary since vfsub routine
+ * will be called later
+ */
+ struct inode *hi = au_h_iptr(inode, bindex);
+ if (hi)
+ err = IS_IMMUTABLE(hi) ? -EROFS : 0;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+int au_test_h_perm(struct inode *h_inode, int mask, int dlgt)
+{
+ if (!current->fsuid)
+ return 0;
+ /* todo: fake nameidata? */
+ return vfsub_permission(h_inode, mask, NULL, dlgt);
+}
+
+int au_test_h_perm_sio(struct inode *h_inode, int mask, int dlgt)
+{
+ if (unlikely(au_test_nfs(h_inode->i_sb)
+ && (mask & MAY_WRITE)
+ && S_ISDIR(h_inode->i_mode)))
+ mask |= MAY_READ; /* force permission check */
+ return au_test_h_perm(h_inode, mask, dlgt);
+}
diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h
new file mode 100644
index 0000000..ce061d5
--- /dev/null
+++ b/fs/aufs/inode.h
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations
+ */
+
+#ifndef __AUFS_INODE_H__
+#define __AUFS_INODE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/aufs_type.h>
+#include "hinode.h"
+#include "misc.h"
+#include "super.h"
+
+struct au_hinode;
+struct au_vdir;
+struct au_iinfo {
+ atomic_t ii_generation;
+ struct super_block *ii_hsb1; /* no get/put */
+
+ struct au_rwsem ii_rwsem;
+ aufs_bindex_t ii_bstart, ii_bend;
+ struct au_hinode *ii_hinode;
+ struct au_vdir *ii_vdir;
+};
+
+struct aufs_icntnr {
+ struct au_iinfo iinfo;
+ struct inode vfs_inode;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* inode.c */
+int au_refresh_hinode_self(struct inode *inode);
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
+struct inode *au_new_inode(struct dentry *dentry);
+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode);
+int au_test_h_perm(struct inode *h_inode, int mask, int dlgt);
+int au_test_h_perm_sio(struct inode *h_inode, int mask, int dlgt);
+
+/* i_op.c */
+extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
+
+/* au_wr_dir flags */
+#define AuWrDir_ADD_ENTRY 1
+#define AuWrDir_LOCK_SRCDIR (1 << 1)
+#define AuWrDir_ISDIR (1 << 2)
+#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
+#define au_fset_wrdir(flags, name) { (flags) |= AuWrDir_##name; }
+#define au_fclr_wrdir(flags, name) { (flags) &= ~AuWrDir_##name; }
+
+struct au_wr_dir_args {
+ aufs_bindex_t force_btgt;
+ unsigned int flags;
+};
+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
+ struct au_wr_dir_args *args);
+
+/* i_op_add.c */
+struct au_ndx;
+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir, struct au_ndx *ndx);
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
+int aufs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd);
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+ struct dentry *dentry);
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+/* i_op_del.c */
+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
+ struct dentry *locked);
+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir, struct au_ndx *ndx);
+int aufs_unlink(struct inode *dir, struct dentry *dentry);
+int aufs_rmdir(struct inode *dir, struct dentry *dentry);
+
+/* i_op_ren.c */
+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
+ struct inode *dir, struct dentry *dentry);
+
+#ifdef CONFIG_AUFS_DLGT
+/* dlgt.c */
+int au_security_inode_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int dlgt);
+#else
+static inline
+int au_security_inode_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int dlgt)
+{
+ return security_inode_permission(h_inode, mask, fake_nd);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+/* br_fuse.c */
+int aufs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st);
+#endif
+
+#if 0 /* reserved for future use */
+/* xattr.c */
+int aufs_setxattr(struct dentry *dentry, const char *name, const void *value,
+ size_t sz, int flags);
+ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value,
+ size_t sz);
+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t sz);
+int aufs_removexattr(struct dentry *dentry, const char *name);
+#endif
+
+/* iinfo.c */
+struct au_iinfo *au_ii(struct inode *inode);
+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
+aufs_bindex_t au_ii_br_id(struct inode *inode, aufs_bindex_t bindex);
+
+void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex);
+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
+ struct dentry *h_wh);
+unsigned int au_hi_flags(struct inode *inode, int isdir);
+
+/* hinode flags */
+#define AuHi_XINO 1
+#define AuHi_NOTIFY (1 << 1)
+#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
+#define au_fset_hi(flags, name) { (flags) |= AuHi_##name; }
+#define au_fclr_hi(flags, name) { (flags) &= ~AuHi_##name; }
+#ifndef CONFIG_AUFS_HINOTIFY
+#undef AuHi_NOTIFY
+#define AuHi_NOTIFY 0
+#endif
+
+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
+ struct inode *h_inode, unsigned int flags);
+
+void au_update_iigen(struct inode *inode);
+void au_update_brange(struct inode *inode, int do_put_zero);
+
+int au_iinfo_init(struct inode *inode);
+void au_iinfo_fin(struct inode *inode);
+
+/* plink.c */
+#ifdef CONFIG_AUFS_DEBUG
+void au_plink_list(struct super_block *sb);
+#else
+static inline void au_plink_list(struct super_block *sb)
+{
+ /* nothing */
+}
+#endif
+int au_plink_test(struct super_block *sb, struct inode *inode);
+struct dentry *au_plink_lkup(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode);
+void au_plink_append(struct super_block *sb, struct inode *inode,
+ struct dentry *h_dentry, aufs_bindex_t bindex);
+void au_plink_put(struct super_block *sb);
+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for iinfo */
+enum {
+ AuLsc_II_CHILD, /* child first */
+ AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hinotify */
+ AuLsc_II_CHILD3, /* copyup dirs */
+ AuLsc_II_PARENT,
+ AuLsc_II_PARENT2,
+ AuLsc_II_PARENT3,
+ AuLsc_II_PARENT4,
+ AuLsc_II_NEW /* new inode */
+};
+
+/*
+ * ii_read_lock_child, ii_write_lock_child,
+ * ii_read_lock_child2, ii_write_lock_child2,
+ * ii_read_lock_child3, ii_write_lock_child3,
+ * ii_read_lock_parent, ii_write_lock_parent,
+ * ii_read_lock_parent2, ii_write_lock_parent2,
+ * ii_read_lock_parent3, ii_write_lock_parent3,
+ * ii_read_lock_parent4, ii_write_lock_parent4,
+ * ii_read_lock_new, ii_write_lock_new
+ */
+#define AuReadLockFunc(name, lsc) \
+static inline void ii_read_lock_##name(struct inode *i) \
+{ au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); }
+
+#define AuWriteLockFunc(name, lsc) \
+static inline void ii_write_lock_##name(struct inode *i) \
+{ au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); }
+
+#define AuRWLockFuncs(name, lsc) \
+ AuReadLockFunc(name, lsc) \
+ AuWriteLockFunc(name, lsc)
+
+AuRWLockFuncs(child, CHILD);
+AuRWLockFuncs(child2, CHILD2);
+AuRWLockFuncs(child3, CHILD3);
+AuRWLockFuncs(parent, PARENT);
+AuRWLockFuncs(parent2, PARENT2);
+AuRWLockFuncs(parent3, PARENT3);
+AuRWLockFuncs(parent4, PARENT4);
+AuRWLockFuncs(new, NEW);
+
+#undef AuReadLockFunc
+#undef AuWriteLockFunc
+#undef AuRWLockFuncs
+
+/*
+ * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
+ */
+AuSimpleUnlockRwsemFuncs(ii, struct inode *i, au_ii(i)->ii_rwsem);
+
+/* to debug easier, do not make them inlined functions */
+#define IiMustReadLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustReadLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustWriteLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustWriteLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustAnyLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustAnyLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+static inline aufs_bindex_t au_ibstart(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bstart;
+}
+
+static inline aufs_bindex_t au_ibend(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_bend;
+}
+
+static inline struct au_vdir *au_ivdir(struct inode *inode)
+{
+ IiMustAnyLock(inode);
+ AuDebugOn(!S_ISDIR(inode->i_mode));
+ return au_ii(inode)->ii_vdir;
+}
+
+static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct au_hinode *hinode;
+ IiMustAnyLock(inode);
+ hinode = au_ii(inode)->ii_hinode + bindex;
+ return hinode->hi_whdentry;
+}
+
+static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ AuDebugOn(au_sbend(inode->i_sb) < bindex || bindex < au_ibstart(inode));
+ au_ii(inode)->ii_bend = bindex;
+}
+
+static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
+{
+ IiMustWriteLock(inode);
+ AuDebugOn(!S_ISDIR(inode->i_mode) || (au_ii(inode)->ii_vdir && vdir));
+ au_ii(inode)->ii_vdir = vdir;
+}
+
+static inline void au_hiput(struct au_hinode *hinode)
+{
+ au_hin_free(hinode);
+ dput(hinode->hi_whdentry);
+ iput(hinode->hi_inode);
+}
+
+static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
+{
+ /* todo: this lock check causes some unnecessary locks in callers. */
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode + bindex;
+}
+
+/* tiny test for inode number */
+/* tmpfs generation is too rough */
+static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
+{
+ IiMustAnyLock(inode);
+ return !(au_ii(inode)->ii_hsb1 == h_inode->i_sb
+ && inode->i_generation == h_inode->i_generation);
+}
+
+static inline au_gen_t au_iigen(struct inode *inode)
+{
+ return atomic_read(&au_ii(inode)->ii_generation);
+}
+
+#ifdef CONFIG_AUFS_HINOTIFY
+static inline au_gen_t au_iigen_dec(struct inode *inode)
+{
+ /* AuDbg("i%lu\n", inode->i_ino); */
+ return atomic_dec_return(&au_ii(inode)->ii_generation);
+}
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_INODE_H__ */
--
1.5.5.1.308.g1fbb5.dirty


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