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Date: Fri, 6 Apr 2012 18:21:56 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Tao Ma <tm@....ma>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH V4 17/22] ext4: let empty_dir handle inline dir.
On 2012-02-20, at 12:01 AM, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
>
> empty_dir is used when deleting a dir. So it should handle
> inline dir properly.
>
> Signed-off-by: Tao Ma <boyu.mt@...bao.com>
> ---
> fs/ext4/inline.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> fs/ext4/namei.c | 8 ++++++
> fs/ext4/xattr.h | 6 ++++
> 3 files changed, 83 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
> index 3126ac3..6612ce1 100644
> --- a/fs/ext4/inline.c
> +++ b/fs/ext4/inline.c
> @@ -1436,6 +1436,75 @@ out:
> return err;
> }
>
> +int empty_inline_dir(struct inode *dir, int *has_inline_data)
> +{
> + int err, inline_size;
> + struct ext4_iloc iloc;
> + void *inline_pos;
> + unsigned int offset;
> + struct ext4_dir_entry_2 *de, *de1;
> + int ret = 1;
> +
> + err = ext4_get_inode_loc(dir, &iloc);
> + if (err) {
> + EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
> + err, dir->i_ino);
> + return 1;
> + }
> +
> + down_read(&EXT4_I(dir)->xattr_sem);
> + if (!ext4_has_inline_data(dir)) {
> + *has_inline_data = 0;
> + goto out;
> + }
> +
> + de = ext4_get_inline_entry(dir, &iloc, 0,
> + &inline_pos, &inline_size);
> + de1 = ext4_get_inline_entry(dir, &iloc,
> + ext4_rec_len_from_disk(de->rec_len, inline_size),
> + &inline_pos, &inline_size);
> + if (le32_to_cpu(de->inode) != dir->i_ino ||
> + !le32_to_cpu(de1->inode) ||
> + strcmp(".", de->name) ||
> + strcmp("..", de1->name)) {
> + ext4_warning(dir->i_sb,
> + "bad directory (dir #%lu) - no `.' or `..'",
> + dir->i_ino);
> + ret = 1;
> + goto out;
> + }
> +
> + offset = ext4_rec_len_from_disk(de->rec_len, inline_size) +
> + ext4_rec_len_from_disk(de1->rec_len, inline_size);
> + while (offset < dir->i_size) {
> + de = ext4_get_inline_entry(dir, &iloc, offset,
> + &inline_pos, &inline_size);
> + if (ext4_check_dir_entry(dir, NULL, de,
> + iloc.bh, inline_pos,
> + inline_size, offset)) {
> + ext4_warning(dir->i_sb,
> + "bad inline directory (dir #%lu) - "
> + "inode %u, rec_len %u, name_len %d"
> + "inline size %d\n",
> + dir->i_ino, le32_to_cpu(de->inode),
> + le16_to_cpu(de->rec_len), de->name_len,
> + inline_size);
> + ret = 1;
> + goto out;
> + }
Most of the code in this function is duplicated with empty_dir(). Instead of
duplicating everything here, it seems that it is possible to just use the code
in empty_dir() with a few small changes:
- a helper function which reads the first directory block instead of ext4_bread()
> + if (le32_to_cpu(de->inode)) {
> + ret = 0;
> + goto out;
> + }
> + offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
> + }
> +
> +out:
> + up_read(&EXT4_I(dir)->xattr_sem);
> + brelse(iloc.bh);
> + return ret;
> +}
> +
> 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 9f7002c..b6b718e 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -2015,6 +2015,14 @@ static int empty_dir(struct inode *inode)
> struct super_block *sb;
> int err = 0;
>
> + if (ext4_has_inline_data(inode)) {
> + int has_inline_data = 1;
> +
> + err = empty_inline_dir(inode, &has_inline_data);
> + if (has_inline_data)
> + return err;
> + }
> +
> sb = inode->i_sb;
> if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) ||
> !(bh = ext4_bread(NULL, inode, 0, 0, &err))) {
> diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
> index 9991143..6ccfa8d 100644
> --- a/fs/ext4/xattr.h
> +++ b/fs/ext4/xattr.h
> @@ -176,6 +176,7 @@ extern int ext4_delete_inline_entry(handle_t *handle,
> struct inode *dir,
> struct ext4_dir_entry_2 *de_del,
> struct buffer_head *bh);
> +extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
> # else /* CONFIG_EXT4_FS_XATTR */
>
> static inline int
> @@ -373,6 +374,11 @@ static inline int ext4_delete_inline_entry(handle_t *handle,
> {
> return 0;
> }
> +
> +static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
> +{
> + return 0;
> +}
> # endif /* CONFIG_EXT4_FS_XATTR */
>
> #ifdef CONFIG_EXT4_FS_SECURITY
> --
> 1.7.0.4
>
> --
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Cheers, Andreas
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