[JFFS2] Fix JFFS2 [mc]time handling

From: David Woodhouse <dwmw2@infradead.org>

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

5 files changed, 37 insertions, 17 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 5738df223775..0fd15aaf2458 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: dir.c,v 1.87 2005/07/17 11:13:46 dedekind Exp $
+ * $Id: dir.c,v 1.88 2005/08/17 13:46:22 dedekind Exp $
  *
  */
 
@@ -232,11 +232,14 @@ static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
         int ret;
+        uint32_t now = get_seconds();
 
         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 
-                               dentry->d_name.len, dead_f);
+                              dentry->d_name.len, dead_f, now);
         if (dead_f->inocache)
                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
+        if (!ret)
+                dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
         return ret;
 }
 /***********************************************************************/
@@ -249,6 +252,7 @@ static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct de
         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
         int ret;
         uint8_t type;
+        uint32_t now;
 
         /* Don't let people make hard links to bad inodes. */
         if (!f->inocache)
@@ -261,13 +265,15 @@ static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct de
         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
         if (!type) type = DT_REG;
 
-        ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
+        now = get_seconds();
+        ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 
         if (!ret) {
                 down(&f->sem);
                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
                 up(&f->sem);
                 d_instantiate(dentry, old_dentry->d_inode);
+                dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
                 atomic_inc(&old_dentry->d_inode->i_count);
         }
         return ret;
@@ -716,6 +722,7 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
         struct jffs2_inode_info *victim_f = NULL;
         uint8_t type;
+        uint32_t now;
 
         /* The VFS will check for us and prevent trying to rename a 
          * file over a directory and vice versa, but if it's a directory,
@@ -749,9 +756,10 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
         if (!type) type = DT_REG;
 
+        now = get_seconds();
         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 
                             old_dentry->d_inode->i_ino, type,
-                            new_dentry->d_name.name, new_dentry->d_name.len);
+                            new_dentry->d_name.name, new_dentry->d_name.len, now);
 
         if (ret)
                 return ret;
@@ -775,7 +783,7 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 
         /* Unlink the original */
         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 
-                      old_dentry->d_name.name, old_dentry->d_name.len, NULL);
+                              old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 
         /* We don't touch inode->i_nlink */
 
@@ -792,12 +800,15 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
                 /* Might as well let the VFS know */
                 d_instantiate(new_dentry, old_dentry->d_inode);
                 atomic_inc(&old_dentry->d_inode->i_count);
+                new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
                 return ret;
         }
 
         if (S_ISDIR(old_dentry->d_inode->i_mode))
                 old_dir_i->i_nlink--;
 
+        new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
+
         return 0;
 }
 
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c
index 362cfeed7327..def97157ecbd 100644
--- a/fs/jffs2/gc.c
+++ b/fs/jffs2/gc.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: gc.c,v 1.152 2005/07/24 15:14:14 dedekind Exp $
+ * $Id: gc.c,v 1.153 2005/08/17 13:46:22 dedekind Exp $
  *
  */
 
@@ -771,7 +771,12 @@ static int jffs2_garbage_collect_dirent(struct jffs2_sb_info *c, struct jffs2_er
         rd.pino = cpu_to_je32(f->inocache->ino);
         rd.version = cpu_to_je32(++f->highest_version);
         rd.ino = cpu_to_je32(fd->ino);
-        rd.mctime = cpu_to_je32(max(JFFS2_F_I_MTIME(f), JFFS2_F_I_CTIME(f)));
+        /* If the times on this inode were set by explicit utime() they can be different,
+           so refrain from splatting them. */
+        if (JFFS2_F_I_MTIME(f) == JFFS2_F_I_CTIME(f))
+                rd.mctime = cpu_to_je32(JFFS2_F_I_MTIME(f));
+        else 
+                rd.mctime = cpu_to_je32(0);
         rd.type = fd->type;
         rd.node_crc = cpu_to_je32(crc32(0, &rd, sizeof(rd)-8));
         rd.name_crc = cpu_to_je32(crc32(0, fd->name, rd.nsize));
@@ -883,6 +888,9 @@ static int jffs2_garbage_collect_deletion_dirent(struct jffs2_sb_info *c, struct
                 kfree(rd);
         }
 
+        /* FIXME: If we're deleting a dirent which contains the current mtime and ctime, 
+           we should update the metadata node with those times accordingly */
+
         /* No need for it any more. Just mark it obsolete and remove it from the list */
         while (*fdp) {
                 if ((*fdp) == fd) {
diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
index adee3c6eb448..ce47d5530a70 100644
--- a/fs/jffs2/nodelist.h
+++ b/fs/jffs2/nodelist.h
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: nodelist.h,v 1.137 2005/08/01 12:05:19 dedekind Exp $
+ * $Id: nodelist.h,v 1.138 2005/08/17 13:46:23 dedekind Exp $
  *
  */
 
@@ -336,8 +336,8 @@ int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
                             struct jffs2_raw_inode *ri, unsigned char *buf, 
                             uint32_t offset, uint32_t writelen, uint32_t *retlen);
 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen);
-int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name, int namelen, struct jffs2_inode_info *dead_f);
-int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen);
+int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name, int namelen, struct jffs2_inode_info *dead_f, uint32_t time);
+int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time);
 
 
 /* readinode.c */
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 50a62dd33e3e..6d5adaba4062 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: readinode.c,v 1.139 2005/08/04 11:41:31 dedekind Exp $
+ * $Id: readinode.c,v 1.140 2005/08/17 13:46:23 dedekind Exp $
  *
  */
 
@@ -139,7 +139,7 @@ static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_r
         fd->type = rd->type;
 
         /* Pick out the mctime of the latest dirent */
-        if(fd->version > *mctime_ver) {
+        if(fd->version > *mctime_ver && je32_to_cpu(rd->mctime)) {
                 *mctime_ver = fd->version;
                 *latest_mctime = je32_to_cpu(rd->mctime);
         }
diff --git a/fs/jffs2/write.c b/fs/jffs2/write.c
index 4c418e69cfc6..0a194759bbbd 100644
--- a/fs/jffs2/write.c
+++ b/fs/jffs2/write.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: write.c,v 1.94 2005/07/20 15:50:51 dedekind Exp $
+ * $Id: write.c,v 1.95 2005/08/17 13:46:23 dedekind Exp $
  *
  */
 
@@ -533,7 +533,8 @@ int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, str
 
 
 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
-                    const char *name, int namelen, struct jffs2_inode_info *dead_f)
+                    const char *name, int namelen, struct jffs2_inode_info *dead_f,
+                    uint32_t time)
 {
         struct jffs2_raw_dirent *rd;
         struct jffs2_full_dirent *fd;
@@ -565,7 +566,7 @@ int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
                 rd->pino = cpu_to_je32(dir_f->inocache->ino);
                 rd->version = cpu_to_je32(++dir_f->highest_version);
                 rd->ino = cpu_to_je32(0);
-                rd->mctime = cpu_to_je32(get_seconds());
+                rd->mctime = cpu_to_je32(time);
                 rd->nsize = namelen;
                 rd->type = DT_UNKNOWN;
                 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
@@ -646,7 +647,7 @@ int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
 }
 
 
-int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen)
+int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time)
 {
         struct jffs2_raw_dirent *rd;
         struct jffs2_full_dirent *fd;
@@ -674,7 +675,7 @@ int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint
         rd->pino = cpu_to_je32(dir_f->inocache->ino);
         rd->version = cpu_to_je32(++dir_f->highest_version);
         rd->ino = cpu_to_je32(ino);
-        rd->mctime = cpu_to_je32(get_seconds());
+        rd->mctime = cpu_to_je32(time);
         rd->nsize = namelen;
 
         rd->type = type;