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authorJan Kara <jack@suse.cz>2012-06-12 16:20:46 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-31 09:45:53 +0400
commit1e8b212fe5dcee9d3dbb152d235f3c33458fb26e (patch)
treec21036f86f455c6289704b35c58c8d01d7821f12 /fs/ext2
parentb2b5ef5c8e89f19b68c174bf246f3ca212dbf0bc (diff)
ext2: Implement freezing
The only missing piece to make freezing work reliably with ext2 is to stop iput() of unlinked inode from deleting the inode on frozen filesystem. So add a necessary protection to ext2_evict_inode(). We also provide appropriate ->freeze_fs and ->unfreeze_fs functions. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ext2')
-rw-r--r--fs/ext2/inode.c5
-rw-r--r--fs/ext2/super.c33
2 files changed, 37 insertions, 1 deletions
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 264d315f6c4..6363ac66faf 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -79,6 +79,7 @@ void ext2_evict_inode(struct inode * inode)
truncate_inode_pages(&inode->i_data, 0);
if (want_delete) {
+ sb_start_intwrite(inode->i_sb);
/* set dtime */
EXT2_I(inode)->i_dtime = get_seconds();
mark_inode_dirty(inode);
@@ -98,8 +99,10 @@ void ext2_evict_inode(struct inode * inode)
if (unlikely(rsv))
kfree(rsv);
- if (want_delete)
+ if (want_delete) {
ext2_free_inode(inode);
+ sb_end_intwrite(inode->i_sb);
+ }
}
typedef struct {
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 5df3d2d8169..15761e638da 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -42,6 +42,8 @@ static void ext2_sync_super(struct super_block *sb,
static int ext2_remount (struct super_block * sb, int * flags, char * data);
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
static int ext2_sync_fs(struct super_block *sb, int wait);
+static int ext2_freeze(struct super_block *sb);
+static int ext2_unfreeze(struct super_block *sb);
void ext2_error(struct super_block *sb, const char *function,
const char *fmt, ...)
@@ -305,6 +307,8 @@ static const struct super_operations ext2_sops = {
.evict_inode = ext2_evict_inode,
.put_super = ext2_put_super,
.sync_fs = ext2_sync_fs,
+ .freeze_fs = ext2_freeze,
+ .unfreeze_fs = ext2_unfreeze,
.statfs = ext2_statfs,
.remount_fs = ext2_remount,
.show_options = ext2_show_options,
@@ -1200,6 +1204,35 @@ static int ext2_sync_fs(struct super_block *sb, int wait)
return 0;
}
+static int ext2_freeze(struct super_block *sb)
+{
+ struct ext2_sb_info *sbi = EXT2_SB(sb);
+
+ /*
+ * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
+ * because we have unattached inodes and thus filesystem is not fully
+ * consistent.
+ */
+ if (atomic_long_read(&sb->s_remove_count)) {
+ ext2_sync_fs(sb, 1);
+ return 0;
+ }
+ /* Set EXT2_FS_VALID flag */
+ spin_lock(&sbi->s_lock);
+ sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
+ spin_unlock(&sbi->s_lock);
+ ext2_sync_super(sb, sbi->s_es, 1);
+
+ return 0;
+}
+
+static int ext2_unfreeze(struct super_block *sb)
+{
+ /* Just write sb to clear EXT2_VALID_FS flag */
+ ext2_write_super(sb);
+
+ return 0;
+}
void ext2_write_super(struct super_block *sb)
{