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Subject[PATCH V2 15/19] ext4: make ext4_delete_entry generic.
Date
From: Tao Ma <boyu.mt@taobao.com>

Currently ext4_delete_entry is used only for dir entry
removing from a dir block. So let us create a new function
ext4_generic_delete_entry and this function takes a entry_buf
and a buf_size so that it can be used for inline data.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
---
fs/ext4/ext4.h | 6 +++++
fs/ext4/namei.c | 62 ++++++++++++++++++++++++++++++++++++------------------
2 files changed, 47 insertions(+), 21 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 9776c06..a88bc00 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1972,6 +1972,12 @@ extern int search_dir(struct buffer_head *bh,
const struct qstr *d_name,
unsigned int offset,
struct ext4_dir_entry_2 **res_dir);
+extern int ext4_generic_delete_entry(handle_t *handle,
+ struct inode *dir,
+ struct ext4_dir_entry_2 *de_del,
+ struct buffer_head *bh,
+ void *entry_buf,
+ int buf_size);

/* resize.c */
extern int ext4_group_add(struct super_block *sb,
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 92f7b67..f706b0f 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1693,32 +1693,28 @@ cleanup:
}

/*
- * ext4_delete_entry deletes a directory entry by merging it with the
- * previous entry
+ * ext4_generic_delete_entry deletes a directory entry by merging it
+ * with the previous entry
*/
-static int ext4_delete_entry(handle_t *handle,
- struct inode *dir,
- struct ext4_dir_entry_2 *de_del,
- struct buffer_head *bh)
+int ext4_generic_delete_entry(handle_t *handle,
+ struct inode *dir,
+ struct ext4_dir_entry_2 *de_del,
+ struct buffer_head *bh,
+ void *entry_buf,
+ int buf_size)
{
struct ext4_dir_entry_2 *de, *pde;
unsigned int blocksize = dir->i_sb->s_blocksize;
- int i, err;
+ int i;

i = 0;
pde = NULL;
- de = (struct ext4_dir_entry_2 *) bh->b_data;
- while (i < bh->b_size) {
+ de = (struct ext4_dir_entry_2 *)entry_buf;
+ while (i < buf_size) {
if (ext4_check_dir_entry(dir, NULL, de, bh,
bh->b_data, bh->b_size, i))
return -EIO;
if (de == de_del) {
- BUFFER_TRACE(bh, "get_write_access");
- err = ext4_journal_get_write_access(handle, bh);
- if (unlikely(err)) {
- ext4_std_error(dir->i_sb, err);
- return err;
- }
if (pde)
pde->rec_len = ext4_rec_len_to_disk(
ext4_rec_len_from_disk(pde->rec_len,
@@ -1729,12 +1725,6 @@ static int ext4_delete_entry(handle_t *handle,
else
de->inode = 0;
dir->i_version++;
- BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_metadata(handle, dir, bh);
- if (unlikely(err)) {
- ext4_std_error(dir->i_sb, err);
- return err;
- }
return 0;
}
i += ext4_rec_len_from_disk(de->rec_len, blocksize);
@@ -1744,6 +1734,36 @@ static int ext4_delete_entry(handle_t *handle,
return -ENOENT;
}

+static int ext4_delete_entry(handle_t *handle,
+ struct inode *dir,
+ struct ext4_dir_entry_2 *de_del,
+ struct buffer_head *bh)
+{
+ int err;
+
+ BUFFER_TRACE(bh, "get_write_access");
+ err = ext4_journal_get_write_access(handle, bh);
+ if (unlikely(err))
+ goto out;
+
+ err = ext4_generic_delete_entry(handle, dir, de_del,
+ bh, bh->b_data,
+ dir->i_sb->s_blocksize);
+ if (err)
+ goto out;
+
+ BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
+ err = ext4_handle_dirty_metadata(handle, dir, bh);
+ if (unlikely(err))
+ goto out;
+
+ return 0;
+out:
+ if (err != -ENOENT)
+ ext4_std_error(dir->i_sb, err);
+ return err;
+}
+
/*
* DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2,
* since this indicates that nlinks count was previously 1.
--
1.7.0.4


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