From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs file private data
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/finfo.c | 185 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 185 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/finfo.c b/fs/aufs/finfo.c
new file mode 100644
index 0000000..74b2ebf
--- /dev/null
+++ b/fs/aufs/finfo.c
@@ -0,0 +1,185 @@
+/*
+ * 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
+ */
+
+/*
+ * file private data
+ *
+ * $Id: finfo.c,v 1.2 2008/04/21 01:35:14 sfjro Exp $
+ */
+
+#include "aufs.h"
+
+struct au_finfo *au_fi(struct file *file)
+{
+ struct au_finfo *finfo = file->private_data;
+ AuDebugOn(!finfo
+ || !finfo->fi_hfile
+ || (0 < finfo->fi_bend
+ && (/* au_sbi(file->f_dentry->d_sb)->si_bend
+ < finfo->fi_bend
+ || */ finfo->fi_bend < finfo->fi_bstart)));
+ return finfo;
+}
+
+struct au_branch *au_fbr(struct file *file, aufs_bindex_t bindex)
+{
+ struct au_finfo *finfo = au_fi(file);
+ struct au_hfile *hf;
+
+ FiMustAnyLock(file);
+ AuDebugOn(!finfo
+ || finfo->fi_bstart < 0
+ || bindex < finfo->fi_bstart
+ || finfo->fi_bend < bindex);
+ hf = finfo->fi_hfile + bindex;
+ AuDebugOn(hf->hf_br && au_br_count(hf->hf_br) <= 0);
+ return hf->hf_br;
+}
+
+struct file *au_h_fptr(struct file *file, aufs_bindex_t bindex)
+{
+ struct au_finfo *finfo = au_fi(file);
+ struct au_hfile *hf;
+
+ FiMustAnyLock(file);
+ AuDebugOn(!finfo
+ || finfo->fi_bstart < 0
+ || bindex < finfo->fi_bstart
+ || finfo->fi_bend < bindex);
+ hf = finfo->fi_hfile + bindex;
+ AuDebugOn(hf->hf_file
+ && file_count(hf->hf_file) <= 0
+ && au_br_count(hf->hf_br) <= 0);
+ return hf->hf_file;
+}
+
+void au_hfput(struct au_hfile *hf)
+{
+ if (hf->hf_file->f_mode & FMODE_EXEC)
+ au_allow_write_access(hf->hf_file);
+ fput(hf->hf_file);
+ hf->hf_file = NULL;
+ AuDebugOn(!hf->hf_br);
+ au_br_put(hf->hf_br);
+ hf->hf_br = NULL;
+}
+
+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
+{
+ struct au_finfo *finfo = au_fi(file);
+ struct au_hfile *hf;
+
+ FiMustWriteLock(file);
+ AuDebugOn(!finfo
+ || finfo->fi_bstart < 0
+ || bindex < finfo->fi_bstart
+ || finfo->fi_bend < bindex);
+ AuDebugOn(val && file_count(val) <= 0);
+ hf = finfo->fi_hfile + bindex;
+ AuDebugOn(val && hf->hf_file);
+ if (hf->hf_file)
+ au_hfput(hf);
+ if (val) {
+ hf->hf_file = val;
+ hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex);
+ }
+}
+
+void au_finfo_fin(struct file *file)
+{
+ struct au_finfo *finfo;
+ struct dentry *dentry;
+ aufs_bindex_t bindex, bend;
+
+ dentry = file->f_dentry;
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+ SiMustAnyLock(dentry->d_sb);
+
+ fi_write_lock(file);
+ bend = au_fbend(file);
+ bindex = au_fbstart(file);
+ if (bindex >= 0)
+ for (; bindex <= bend; bindex++)
+ au_set_h_fptr(file, bindex, NULL);
+
+ finfo = au_fi(file);
+#ifdef CONFIG_AUFS_DEBUG
+ if (finfo->fi_bstart >= 0) {
+ bend = au_fbend(file);
+ for (bindex = finfo->fi_bstart; bindex <= bend; bindex++) {
+ struct au_hfile *hf;
+ hf = finfo->fi_hfile + bindex;
+ AuDebugOn(hf->hf_file || hf->hf_br);
+ }
+ }
+#endif
+
+ kfree(finfo->fi_hfile);
+ fi_write_unlock(file);
+ au_cache_free_finfo(finfo);
+ //file->private_data = NULL;
+}
+
+int au_finfo_init(struct file *file)
+{
+ struct au_finfo *finfo;
+ struct dentry *dentry;
+ union {
+ void *p;
+ unsigned long ul;
+ } u;
+
+ dentry = file->f_dentry;
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+ AuDebugOn(!dentry->d_inode);
+
+ finfo = au_cache_alloc_finfo();
+ if (finfo) {
+ finfo->fi_hfile = kcalloc(au_sbend(dentry->d_sb) + 1,
+ sizeof(*finfo->fi_hfile), GFP_KERNEL);
+ if (finfo->fi_hfile) {
+ au_rw_init_wlock(&finfo->fi_rwsem);
+ finfo->fi_bstart = -1;
+ finfo->fi_bend = -1;
+ atomic_set(&finfo->fi_generation, au_digen(dentry));
+ //smp_mb(); /* atomic_set */
+
+ /*
+ * a dirty trick for handling FMODE_EXEC and
+ * deny_write_access().
+ * because FMODE_EXEC flag is not passed to
+ * f_op->open(),
+ * aufs set it to file->private_data temporary in lookup
+ * or dentry revalidation operations.
+ * restore the flag to f_mode here.
+ */
+ u.p = file->private_data;
+ if (u.ul & FMODE_EXEC) {
+ file->f_mode |= FMODE_EXEC;
+ smp_mb(); /* flush f_mode */
+ }
+
+ file->private_data = finfo;
+ return 0; /* success */
+ }
+ au_cache_free_finfo(finfo);
+ }
+
+ AuTraceErr(-ENOMEM);
+ return -ENOMEM;
+}
--
1.4.4.4
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