From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs inode private data
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/iinfo.c | 290 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 290 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c
new file mode 100644
index 0000000..c8eb976
--- /dev/null
+++ b/fs/aufs/iinfo.c
@@ -0,0 +1,290 @@
+/*
+ * 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
+ *
+ * $Id: iinfo.c,v 1.2 2008/04/21 01:32:05 sfjro Exp $
+ */
+
+#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;
+}
+
+// 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) {
+#if 0 // remove this
+ if (!hi->i_nlink && au_ftest_hi(flags, XINO)) {
+ AuDebugOn(au_sbr_id(sb, bindex) != hinode->hi_id);
+ au_xino_write0(inode->i_sb, bindex, hi->i_ino, 0);
+ /* ignore this error */
+ /* bad action? */
+ }
+#endif
+ 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)
+{
+ //IiMustWriteLock(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);
+ //iinfo->ii_hinode = NULL;
+ 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++;
+ }
+ //iinfo->ii_bstart = iinfo->ii_bend = -1;
+ }
+
+ kfree(iinfo->ii_hinode);
+ //iinfo->ii_hinode = NULL;
+}
--
1.4.4.4
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