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Subject[PATCH V2 18/19] ext4: let ext4_rename handle inline dir.
Date
From: Tao Ma <boyu.mt@taobao.com>

In case of we rename a dir, ext4_rename has to read the dir block
and change its dotdot's information. The old ext4_rename encapsulated
the dir_block read into itself. So this patch try to add a new function
ext4_get_dir_block which get the dir buffer information so the
ext4_rename can handle it properly.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
---
fs/ext4/inline.c | 15 +++++++++++++++
fs/ext4/namei.c | 38 ++++++++++++++++++++++++++++++++------
fs/ext4/xattr.h | 12 ++++++++++++
3 files changed, 59 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 4930e2e..d73585e 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -1476,6 +1476,21 @@ out:
return ret;
}

+struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
+ void **buf, int *buf_size, int *retval)
+{
+ struct ext4_iloc iloc;
+
+ *retval = ext4_get_inode_loc(inode, &iloc);
+ if (*retval)
+ return NULL;
+
+ *buf = ext4_raw_inode(&iloc)->i_block;
+ *buf_size = EXT4_MIN_INLINE_DATA_SIZE;
+
+ return iloc.bh;
+}
+
int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
{
int ret;
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 24cdb61..cc4db68 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2507,6 +2507,31 @@ retry:
(ext4_next_entry((struct ext4_dir_entry_2 *)(buffer), size)->inode)

/*
+ * Try to find buffer head where contains the parent block.
+ * It should be the inode block if it is inlined or the 1st block
+ * if it is a normal dir.
+ */
+static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
+ struct inode *inode,
+ void **buf,
+ int *buf_size,
+ int *retval)
+{
+ struct buffer_head *bh;
+
+ if (!ext4_has_inline_data(inode)) {
+ bh = ext4_bread(handle, inode, 0, 0, retval);
+ if (!bh)
+ return NULL;
+ *buf = bh->b_data;
+ *buf_size = inode->i_sb->s_blocksize;
+ return bh;
+ }
+
+ return ext4_get_first_inline_block(inode, buf, buf_size, retval);
+}
+
+/*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
@@ -2517,7 +2542,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *old_inode, *new_inode;
struct buffer_head *old_bh, *new_bh, *dir_bh;
struct ext4_dir_entry_2 *old_de, *new_de;
- int retval, force_da_alloc = 0;
+ int buf_size, retval, force_da_alloc = 0;
+ void *dir_buf = NULL;

dquot_initialize(old_dir);
dquot_initialize(new_dir);
@@ -2564,11 +2590,12 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
goto end_rename;
}
retval = -EIO;
- dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval);
+ dir_bh = ext4_get_first_dir_block(handle, old_inode,
+ &dir_buf, &buf_size, &retval);
if (!dir_bh)
goto end_rename;
- if (le32_to_cpu(PARENT_INO(dir_bh->b_data,
- old_dir->i_sb->s_blocksize)) != old_dir->i_ino)
+ if (le32_to_cpu(PARENT_INO(dir_buf,
+ buf_size)) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir != old_dir &&
@@ -2648,8 +2675,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
old_dir->i_ctime = old_dir->i_mtime = ext4_current_time(old_dir);
ext4_update_dx_flag(old_dir);
if (dir_bh) {
- PARENT_INO(dir_bh->b_data, new_dir->i_sb->s_blocksize) =
- cpu_to_le32(new_dir->i_ino);
+ PARENT_INO(dir_buf, buf_size) = cpu_to_le32(new_dir->i_ino);
BUFFER_TRACE(dir_bh, "call ext4_handle_dirty_metadata");
retval = ext4_handle_dirty_metadata(handle, old_inode, dir_bh);
if (retval) {
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index d889582..5300206 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -179,6 +179,10 @@ extern int ext4_delete_inline_entry(handle_t *handle,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh);
extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
+extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
+ void **buf,
+ int *buf_size,
+ int *retval);
# else /* CONFIG_EXT4_FS_XATTR */

static inline int
@@ -387,6 +391,14 @@ static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
{
return 0;
}
+
+static inline struct buffer_head *
+ext4_get_first_inline_block(struct inode *inode,
+ void **buf, int *buf_size,
+ int *retval)
+{
+ return NULL;
+}
# endif /* CONFIG_EXT4_FS_XATTR */

#ifdef CONFIG_EXT4_FS_SECURITY
--
1.7.0.4


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