From mboxrd@z Thu Jan 1 00:00:00 1970 From: kumar.srivastava.pranay@gmail.com (Pranay Srivastava) Date: Thu, 29 Dec 2016 12:35:52 +0530 Subject: Fwd: Need some help regarding write_begin, write_end and writepage(s). In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org Hello, I'm trying to understand the write_begin, write_end and writepages / writepage call sequence by having a small file system coded myself. I'm not using block_write_begin / block_write_end also not using mpage_writepages as well. The issue however is that apart from write_begin and write_end, writepages never gets called. However if I do write_inode_now ( in write_end) then writepage do get called, but that's not how it's supposed to be. 1. in write_begin : I'm able to grab_cache_page_begin and returned it locked. 2. in write_end: I'm able to allocate disk space and do SetPageDirty and SetPageUptodate unlock_page and page_cache_release. 3. I also tried __mark_inode_dirty(inode, I_DIRTY_PAGES) 4. I also tried to set_page_writeback, but apparently that then makes the iput_final stuck since it waits for PG_Writeback to be cleared and that I've coded in writepage which never gets called. but writepages never gets called. Even iput_final doesn't make the write_inode_now call. Any help would be appreciated. Regards,