From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs inode functions
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/inode.c | 425 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 425 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/inode.c b/fs/aufs/inode.c
new file mode 100644
index 0000000..7bab2cc
--- /dev/null
+++ b/fs/aufs/inode.c
@@ -0,0 +1,425 @@
+/*
+ * 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
+ *
+ * $Id: inode.c,v 1.3 2008/04/28 03:04:12 sfjro Exp $
+ */
+
+#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);
+ //p = NULL;
+ 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;
+#if 0
+ const int hinotify = au_opt_test(au_mntflags(inode->i_sb),
+ UDBA_INOTIFY);
+#endif
+
+ 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);
+ //err = -1;
+ 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);
+ //err = -1;
+ unlock_new_inode(inode);
+ if (!err)
+ goto out; /* success */
+ iget_failed(inode);
+ ii_write_unlock(inode);
+ goto out_iput;
+ } else {
+ //todo: remove this
+ 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);
+#if 0 // debug
+ {
+ static unsigned char c;
+ if (!c++) {
+ struct dentry *d = d_find_alias(inode);
+ au_debug_on();
+ DbgDentry(dentry);
+ DbgInode(inode);
+ if (d) {
+ DbgDentry(d);
+ dput(d);
+ }
+ au_debug_off();
+ }
+ }
+#endif
+ 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);
+}
--
1.4.4.4
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