Staging: Pohmelfs: Extend remount option.

Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 46 insertions, 27 deletions

diff --git a/drivers/staging/pohmelfs/inode.c b/drivers/staging/pohmelfs/inode.c
index 00570d9c265a..3fef09fd712c 100644
--- a/drivers/staging/pohmelfs/inode.c
+++ b/drivers/staging/pohmelfs/inode.c
@@ -1169,16 +1169,17 @@ err_out_put:
 static int pohmelfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
         struct inode *inode = dentry->d_inode;
+#if 0
         struct pohmelfs_inode *pi = POHMELFS_I(inode);
         int err;
-#if 0
+
         err = pohmelfs_data_lock(pi, 0, ~0, POHMELFS_READ_LOCK);
         if (err)
                 return err;
-#endif
         dprintk("%s: ino: %llu, mode: %o, uid: %u, gid: %u, size: %llu.\n",
                         __func__, pi->ino, inode->i_mode, inode->i_uid,
                         inode->i_gid, inode->i_size);
+#endif
 
         generic_fillattr(inode, stat);
         return 0;
@@ -1346,12 +1347,6 @@ static void pohmelfs_put_super(struct super_block *sb)
         pohmelfs_ftrans_exit();
 }
 
-static int pohmelfs_remount(struct super_block *sb, int *flags, char *data)
-{
-        *flags |= MS_RDONLY;
-        return 0;
-}
-
 static int pohmelfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
         struct super_block *sb = dentry->d_sb;
@@ -1394,42 +1389,33 @@ static int pohmelfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
         return 0;
 }
 
-static const struct super_operations pohmelfs_sb_ops = {
-        .alloc_inode    = pohmelfs_alloc_inode,
-        .destroy_inode  = pohmelfs_destroy_inode,
-        .drop_inode     = pohmelfs_drop_inode,
-        .write_inode    = pohmelfs_write_inode,
-        .put_super      = pohmelfs_put_super,
-        .remount_fs     = pohmelfs_remount,
-        .statfs         = pohmelfs_statfs,
-        .show_options   = pohmelfs_show_options,
-};
-
 enum {
         pohmelfs_opt_idx,
+        pohmelfs_opt_crypto_thread_num,
+        pohmelfs_opt_trans_max_pages,
+        pohmelfs_opt_crypto_fail_unsupported,
+
+        /* Remountable options */
         pohmelfs_opt_trans_scan_timeout,
         pohmelfs_opt_drop_scan_timeout,
         pohmelfs_opt_wait_on_page_timeout,
         pohmelfs_opt_trans_retries,
-        pohmelfs_opt_crypto_thread_num,
-        pohmelfs_opt_trans_max_pages,
-        pohmelfs_opt_crypto_fail_unsupported,
         pohmelfs_opt_mcache_timeout,
 };
 
 static struct match_token pohmelfs_tokens[] = {
         {pohmelfs_opt_idx, "idx=%u"},
+        {pohmelfs_opt_crypto_thread_num, "crypto_thread_num=%u"},
+        {pohmelfs_opt_trans_max_pages, "trans_max_pages=%u"},
+        {pohmelfs_opt_crypto_fail_unsupported, "crypto_fail_unsupported"},
         {pohmelfs_opt_trans_scan_timeout, "trans_scan_timeout=%u"},
         {pohmelfs_opt_drop_scan_timeout, "drop_scan_timeout=%u"},
         {pohmelfs_opt_wait_on_page_timeout, "wait_on_page_timeout=%u"},
         {pohmelfs_opt_trans_retries, "trans_retries=%u"},
-        {pohmelfs_opt_crypto_thread_num, "crypto_thread_num=%u"},
-        {pohmelfs_opt_trans_max_pages, "trans_max_pages=%u"},
-        {pohmelfs_opt_crypto_fail_unsupported, "crypto_fail_unsupported"},
         {pohmelfs_opt_mcache_timeout, "mcache_timeout=%u"},
 };
 
-static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb)
+static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb, int remount)
 {
         char *p;
         substring_t args[MAX_OPT_ARGS];
@@ -1449,6 +1435,9 @@ static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb)
                 if (err)
                         return err;
 
+                if (remount && token <= pohmelfs_opt_crypto_fail_unsupported)
+                        continue;
+
                 switch (token) {
                         case pohmelfs_opt_idx:
                                 psb->idx = option;
@@ -1485,6 +1474,25 @@ static int pohmelfs_parse_options(char *options, struct pohmelfs_sb *psb)
         return 0;
 }
 
+static int pohmelfs_remount(struct super_block *sb, int *flags, char *data)
+{
+        int err;
+        struct pohmelfs_sb *psb = POHMELFS_SB(sb);
+        unsigned long old_sb_flags = sb->s_flags;
+
+        err = pohmelfs_parse_options(data, psb, 1);
+        if (err)
+                goto err_out_restore;
+
+        if (!(*flags & MS_RDONLY))
+                sb->s_flags &= ~MS_RDONLY;
+        return 0;
+
+err_out_restore:
+        sb->s_flags = old_sb_flags;
+        return err;
+}
+
 static void pohmelfs_flush_inode(struct pohmelfs_inode *pi, unsigned int count)
 {
         struct inode *inode = &pi->vfs_inode;
@@ -1753,6 +1761,17 @@ err_out_exit:
         return err;
 }
 
+static const struct super_operations pohmelfs_sb_ops = {
+        .alloc_inode    = pohmelfs_alloc_inode,
+        .destroy_inode  = pohmelfs_destroy_inode,
+        .drop_inode     = pohmelfs_drop_inode,
+        .write_inode    = pohmelfs_write_inode,
+        .put_super      = pohmelfs_put_super,
+        .remount_fs     = pohmelfs_remount,
+        .statfs         = pohmelfs_statfs,
+        .show_options   = pohmelfs_show_options,
+};
+
 /*
  * Allocate private superblock and create root dir.
  */
@@ -1816,7 +1835,7 @@ static int pohmelfs_fill_super(struct super_block *sb, void *data, int silent)
         mutex_init(&psb->state_lock);
         INIT_LIST_HEAD(&psb->state_list);
 
-        err = pohmelfs_parse_options((char *) data, psb);
+        err = pohmelfs_parse_options((char *) data, psb, 0);
         if (err)
                 goto err_out_free_sb;