Re: ext4: delayed allocation support and mmap

On Wed, Aug 17, 2011 at 2:49 PM, Jan Kara [off-list ref] wrote:

 Hi,

On Wed 17-08-11 14:02:09, Surbhi Palande wrote:

quoted

Current ext4_page_mkwrite() implementation always allocates a block
through  ext4_get_block_write() or ext4_get_block().

 Why do you think so? Look at:
       /* Delalloc case is easy... */
       if (test_opt(inode->i_sb, DELALLOC) &&
           !ext4_should_journal_data(inode) &&
           !ext4_nonda_switch(inode->i_sb)) {
               do {
                       ret = __block_page_mkwrite(vma, vmf,
                                                  ext4_da_get_block_prep);
               } while (ret == -ENOSPC &&
                      ext4_should_retry_alloc(inode->i_sb, &retries));
               goto out_ret;
       }

Oops! Sorry about that :(

Regards,
Surbhi.

                                                               Honza
--
Jan Kara [off-list ref]
SUSE Labs, CR

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