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Date:	Sun, 10 Feb 2013 21:42:58 +0800
From:	Tao Ma <tm@....ma>
To:	Theodore Ts'o <tytso@....edu>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Tao Ma <boyu.mt@...bao.com>
Subject: Re: [PATCH 11/12] ext4: fix the number of credits needed for acl
 ops with inline data

On 02/10/2013 05:53 AM, Theodore Ts'o wrote:
> Operations which modify extended attributes may need extra journal
> credits if inline data is used, since there is a chance that some
> extended attributes may need to get pushed to an external attribute
> block.
> 
> Changes to reflect this was made in xattr.c, but they were missed in
> fs/ext4/acl.c.  To fix this, abstract the calculation of the number of
> credits needed for xattr operations to an inline function defined in
> ext4_jbd2.h, and use it in acl.c and xattr.c.
Oh, yes, I forgot about the acl.

Reviewed-by: Tao Ma <boyu.mt@...bao.com>

Thanks,
Tao
> 
> Also move the function declarations used in inline.c from xattr.h
> (where they are non-obviously hidden, and caused problems since
> ext4_jbd2.h needs to use the function ext4_has_inline_data), and move
> them to ext4.h.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> Cc: Tao Ma <boyu.mt@...bao.com>
> ---
>  fs/ext4/acl.c       |  4 +--
>  fs/ext4/ext4.h      | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  fs/ext4/ext4_jbd2.h | 14 +++++++++++
>  fs/ext4/xattr.c     |  9 +------
>  fs/ext4/xattr.h     | 68 ---------------------------------------------------
>  5 files changed, 87 insertions(+), 78 deletions(-)
> 
> diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
> index 406cf8b..39a54a0 100644
> --- a/fs/ext4/acl.c
> +++ b/fs/ext4/acl.c
> @@ -325,7 +325,7 @@ ext4_acl_chmod(struct inode *inode)
>  		return error;
>  retry:
>  	handle = ext4_journal_start(inode, EXT4_HT_XATTR,
> -			EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
> +				    ext4_jbd2_credits_xattr(inode));
>  	if (IS_ERR(handle)) {
>  		error = PTR_ERR(handle);
>  		ext4_std_error(inode->i_sb, error);
> @@ -423,7 +423,7 @@ ext4_xattr_set_acl(struct dentry *dentry, const char *name, const void *value,
>  
>  retry:
>  	handle = ext4_journal_start(inode, EXT4_HT_XATTR,
> -				    EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
> +				    ext4_jbd2_credits_xattr(inode));
>  	if (IS_ERR(handle)) {
>  		error = PTR_ERR(handle);
>  		goto release_and_out;
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index c2c64da..9897cdf 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2443,6 +2443,75 @@ extern const struct file_operations ext4_file_operations;
>  extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
>  extern void ext4_unwritten_wait(struct inode *inode);
>  
> +/* inline.c */
> +extern int ext4_has_inline_data(struct inode *inode);
> +extern int ext4_get_inline_size(struct inode *inode);
> +extern int ext4_get_max_inline_size(struct inode *inode);
> +extern int ext4_find_inline_data_nolock(struct inode *inode);
> +extern void ext4_write_inline_data(struct inode *inode,
> +				   struct ext4_iloc *iloc,
> +				   void *buffer, loff_t pos,
> +				   unsigned int len);
> +extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
> +				    unsigned int len);
> +extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
> +				 unsigned int len);
> +extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
> +
> +extern int ext4_readpage_inline(struct inode *inode, struct page *page);
> +extern int ext4_try_to_write_inline_data(struct address_space *mapping,
> +					 struct inode *inode,
> +					 loff_t pos, unsigned len,
> +					 unsigned flags,
> +					 struct page **pagep);
> +extern int ext4_write_inline_data_end(struct inode *inode,
> +				      loff_t pos, unsigned len,
> +				      unsigned copied,
> +				      struct page *page);
> +extern struct buffer_head *
> +ext4_journalled_write_inline_data(struct inode *inode,
> +				  unsigned len,
> +				  struct page *page);
> +extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
> +					   struct inode *inode,
> +					   loff_t pos, unsigned len,
> +					   unsigned flags,
> +					   struct page **pagep,
> +					   void **fsdata);
> +extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
> +					 unsigned len, unsigned copied,
> +					 struct page *page);
> +extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
> +				     struct inode *inode);
> +extern int ext4_try_create_inline_dir(handle_t *handle,
> +				      struct inode *parent,
> +				      struct inode *inode);
> +extern int ext4_read_inline_dir(struct file *filp,
> +				void *dirent, filldir_t filldir,
> +				int *has_inline_data);
> +extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
> +					const struct qstr *d_name,
> +					struct ext4_dir_entry_2 **res_dir,
> +					int *has_inline_data);
> +extern int ext4_delete_inline_entry(handle_t *handle,
> +				    struct inode *dir,
> +				    struct ext4_dir_entry_2 *de_del,
> +				    struct buffer_head *bh,
> +				    int *has_inline_data);
> +extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
> +extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
> +					struct ext4_dir_entry_2 **parent_de,
> +					int *retval);
> +extern int ext4_inline_data_fiemap(struct inode *inode,
> +				   struct fiemap_extent_info *fieinfo,
> +				   int *has_inline);
> +extern int ext4_try_to_evict_inline_data(handle_t *handle,
> +					 struct inode *inode,
> +					 int needed);
> +extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
> +
> +extern int ext4_convert_inline_data(struct inode *inode);
> +
>  /* namei.c */
>  extern const struct inode_operations ext4_dir_inode_operations;
>  extern const struct inode_operations ext4_special_inode_operations;
> @@ -2539,6 +2608,7 @@ extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
>  extern int ext4_mmp_csum_verify(struct super_block *sb,
>  				struct mmp_struct *mmp);
>  
> +
>  /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
>  enum ext4_state_bits {
>  	BH_Uninit	/* blocks are allocated but uninitialized on disk */
> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> index c1fc2dc..4c216b1 100644
> --- a/fs/ext4/ext4_jbd2.h
> +++ b/fs/ext4/ext4_jbd2.h
> @@ -104,6 +104,20 @@
>  #define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
>  #define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
>  
> +static inline int ext4_jbd2_credits_xattr(struct inode *inode)
> +{
> +	int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb);
> +
> +	/*
> +	 * In case of inline data, we may push out the data to a block,
> +	 * so we need to reserve credits for this eventuality
> +	 */
> +	if (ext4_has_inline_data(inode))
> +		credits += ext4_writepage_trans_blocks(inode) + 1;
> +	return credits;
> +}
> +
> +
>  /*
>   * Ext4 handle operation types -- for logging purposes
>   */
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 2efc560..cc31da0 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -1165,16 +1165,9 @@ ext4_xattr_set(struct inode *inode, int name_index, const char *name,
>  {
>  	handle_t *handle;
>  	int error, retries = 0;
> -	int credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb);
> +	int credits = ext4_jbd2_credits_xattr(inode);
>  
>  retry:
> -	/*
> -	 * In case of inline data, we may push out the data to a block,
> -	 * So reserve the journal space first.
> -	 */
> -	if (ext4_has_inline_data(inode))
> -		credits += ext4_writepage_trans_blocks(inode) + 1;
> -
>  	handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits);
>  	if (IS_ERR(handle)) {
>  		error = PTR_ERR(handle);
> diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
> index 69eda78..aa25deb 100644
> --- a/fs/ext4/xattr.h
> +++ b/fs/ext4/xattr.h
> @@ -125,74 +125,6 @@ extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
>  				       struct ext4_xattr_info *i,
>  				       struct ext4_xattr_ibody_find *is);
>  
> -extern int ext4_has_inline_data(struct inode *inode);
> -extern int ext4_get_inline_size(struct inode *inode);
> -extern int ext4_get_max_inline_size(struct inode *inode);
> -extern int ext4_find_inline_data_nolock(struct inode *inode);
> -extern void ext4_write_inline_data(struct inode *inode,
> -				   struct ext4_iloc *iloc,
> -				   void *buffer, loff_t pos,
> -				   unsigned int len);
> -extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
> -				    unsigned int len);
> -extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
> -				 unsigned int len);
> -extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
> -
> -extern int ext4_readpage_inline(struct inode *inode, struct page *page);
> -extern int ext4_try_to_write_inline_data(struct address_space *mapping,
> -					 struct inode *inode,
> -					 loff_t pos, unsigned len,
> -					 unsigned flags,
> -					 struct page **pagep);
> -extern int ext4_write_inline_data_end(struct inode *inode,
> -				      loff_t pos, unsigned len,
> -				      unsigned copied,
> -				      struct page *page);
> -extern struct buffer_head *
> -ext4_journalled_write_inline_data(struct inode *inode,
> -				  unsigned len,
> -				  struct page *page);
> -extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
> -					   struct inode *inode,
> -					   loff_t pos, unsigned len,
> -					   unsigned flags,
> -					   struct page **pagep,
> -					   void **fsdata);
> -extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
> -					 unsigned len, unsigned copied,
> -					 struct page *page);
> -extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
> -				     struct inode *inode);
> -extern int ext4_try_create_inline_dir(handle_t *handle,
> -				      struct inode *parent,
> -				      struct inode *inode);
> -extern int ext4_read_inline_dir(struct file *filp,
> -				void *dirent, filldir_t filldir,
> -				int *has_inline_data);
> -extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
> -					const struct qstr *d_name,
> -					struct ext4_dir_entry_2 **res_dir,
> -					int *has_inline_data);
> -extern int ext4_delete_inline_entry(handle_t *handle,
> -				    struct inode *dir,
> -				    struct ext4_dir_entry_2 *de_del,
> -				    struct buffer_head *bh,
> -				    int *has_inline_data);
> -extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
> -extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
> -					struct ext4_dir_entry_2 **parent_de,
> -					int *retval);
> -extern int ext4_inline_data_fiemap(struct inode *inode,
> -				   struct fiemap_extent_info *fieinfo,
> -				   int *has_inline);
> -extern int ext4_try_to_evict_inline_data(handle_t *handle,
> -					 struct inode *inode,
> -					 int needed);
> -extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
> -
> -extern int ext4_convert_inline_data(struct inode *inode);
> -
>  #ifdef CONFIG_EXT4_FS_SECURITY
>  extern int ext4_init_security(handle_t *handle, struct inode *inode,
>  			      struct inode *dir, const struct qstr *qstr);
> 

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