From: Tao Ma <boyu.mt@xxxxxxxxxx>
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@xxxxxxxxxx>
---
fs/ext4/namei.c | 50 ++++++++++++++++++++++++++++++++++++++++++++------
1 files changed, 44 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 343af6c..cb1b396 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2777,6 +2777,43 @@ 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_dir_block(handle_t *handle,
+ struct inode *inode,
+ void **buf,
+ int *buf_size,
+ int *retval)
+{
+ struct buffer_head *bh;
+ void *inline_start;
+ int inline_size;
+ struct ext4_iloc iloc;
+
+ 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;
+ }
+
+ *retval = ext4_get_inode_loc(inode, &iloc);
+ if (*retval)
+ return NULL;
+
+ inline_start = ext4_get_inline_data_pos(inode, &iloc);
+ inline_size = ext4_get_max_inline_size(inode);
+
+ *buf = inline_start;
+ *buf_size = inline_size;
+ return iloc.bh;
+}
+
+/*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
@@ -2787,7 +2824,8 @@ 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);
@@ -2834,11 +2872,12 @@ 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_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 &&
@@ -2918,8 +2957,7 @@ 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) {
--
1.7.0.4
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