f2fs: do not make dirty any inmemory pages

This patch let inmemory pages be clean all the time.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: invalidate inmemory page

If user truncates file's data, we should truncate inmemory pages too.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: should truncate any allocated block for inline_data write

When trying to write inline_data, we should truncate any data block allocated
and pointed by the inode block.
We should consider the data index is not 0.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: fix race conditon on truncation with inline_data

Let's consider the following scenario.

blkaddr[0] inline_data i_size  i_blocks writepage           truncate
  NEW        X        4096        2    dirty page #0
  NEW        X         0                                    change i_size
  NEW        X         0          2    f2fs_write_inline_data
  NEW        X         0          2    get_dnode_of_data
  NEW        X         0          2    truncate_data_blocks_range
  NULL       O         0          1    memcpy(inline_data)
  NULL       O         0          1    f2fs_put_dnode
  NULL       O         0          1                         f2fs_truncate
  NULL       O         0          1                         get_dnode_of_data
  NULL       O         0          1                       *invalid block addr*

This patch adds checking inline_data flag during f2fs_truncate not to refer
corrupted block indices.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: use highmem for directory pages

This patch fixes to use highmem for directory pages.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: avoid to allocate when inline_data was written

The sceanrio is like this.
inline_data   i_size     page                 write_begin/vm_page_mkwrite
  X             30       dirty_page
  X             30                            write to #4096 position
  X             30       get_dnode_of_data    wait for get_dnode_of_data
  O             30       write inline_data
  O             30                            get_dnode_of_data
  O             30                            reserve data block
..

In this case, we have #0 = NEW_ADDR and inline_data as well.
We should not allow this condition for further access.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: fix to call f2fs_unlock_op

This patch fixes to call f2fs_unlock_op, which was missing before.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: avoid build warning

This patch removes build warning.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: avoid infinite loop at cp_error

This patch avoids an infinite loop in sync_dirty_inode_page when -EIO was
detected.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: add infra struct and helper for inline dir

This patch defines macro/inline dentry structure, and adds some helpers for
inline dir infrastructure.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: add a new mount option for inline dir

Adds a new mount option 'inline_dentry' for inline dir.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: export dir operations for inline dir

This patch exports some dir operations for inline dir, additionally introduces
f2fs_drop_nlink from f2fs_delete_entry for reusing by inline dir function.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: add key function to handle inline dir

Adds Functions to implement inline dir init/lookup/insert/delete/convert ops.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
[Jaegeuk Kim: remove needless reserved area copy, pointed by Dan Carpenter]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: enable inline dir handling

Add inline dir functions into normal dir ops' function to handle inline ops.
Besides, we enable inline dir mode when a new dir inode is created if
inline_data option is on.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Conflicts:
	fs/f2fs/dir.c
f2fs: reuse room_for_filename for inline dentry operation

This patch introduces to reuse the existing room_for_filename for inline dentry
operation.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: reuse find_in_block code for find_in_inline_dir

This patch removes redundant copied code in find_in_inline_dir.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: fix to wait correct block type

The inode page needs to wait NODE block io.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: avoid deadlock on init_inode_metadata

Previously, init_inode_metadata does not hold any parent directory's inode
page. So, f2fs_init_acl can grab its parent inode page without any problem.
But, when we use inline_dentry, that page is grabbed during f2fs_add_link,
so that we can fall into deadlock condition like below.

INFO: task mknod:11006 blocked for more than 120 seconds.
      Tainted: G           OE  3.17.0-rc1+ #13
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mknod           D ffff88003fc94580     0 11006  11004 0x00000000
 ffff880007717b10 0000000000000002 ffff88003c323220 ffff880007717fd8
 0000000000014580 0000000000014580 ffff88003daecb30 ffff88003c323220
 ffff88003fc94e80 ffff88003ffbb4e8 ffff880007717ba0 0000000000000002
Call Trace:
 [<ffffffff8173dc40>] ? bit_wait+0x50/0x50
 [<ffffffff8173d4cd>] io_schedule+0x9d/0x130
 [<ffffffff8173dc6c>] bit_wait_io+0x2c/0x50
 [<ffffffff8173da3b>] __wait_on_bit_lock+0x4b/0xb0
 [<ffffffff811640a7>] __lock_page+0x67/0x70
 [<ffffffff810acf50>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811652cc>] pagecache_get_page+0x14c/0x1e0
 [<ffffffffa029afa9>] get_node_page+0x59/0x130 [f2fs]
 [<ffffffffa02a63ad>] read_all_xattrs+0x24d/0x430 [f2fs]
 [<ffffffffa02a6ca2>] f2fs_getxattr+0x52/0xe0 [f2fs]
 [<ffffffffa02a7481>] f2fs_get_acl+0x41/0x2d0 [f2fs]
 [<ffffffff8122d847>] get_acl+0x47/0x70
 [<ffffffff8122db5a>] posix_acl_create+0x5a/0x150
 [<ffffffffa02a7759>] f2fs_init_acl+0x29/0xcb [f2fs]
 [<ffffffffa0286a8d>] init_inode_metadata+0x5d/0x340 [f2fs]
 [<ffffffffa029253a>] f2fs_add_inline_entry+0x12a/0x2e0 [f2fs]
 [<ffffffffa0286ea5>] __f2fs_add_link+0x45/0x4a0 [f2fs]
 [<ffffffffa028b5b6>] ? f2fs_new_inode+0x146/0x220 [f2fs]
 [<ffffffffa028b816>] f2fs_mknod+0x86/0xf0 [f2fs]
 [<ffffffff811e3ec1>] vfs_mknod+0xe1/0x160
 [<ffffffff811e4b26>] SyS_mknod+0x1f6/0x200
 [<ffffffff81741d7f>] tracesys+0xe1/0xe6

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Conflicts:
	fs/f2fs/acl.c
f2fs: add stat info for inline_dentry inodes

This patch adds status information for inline_dentry inodes.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
f2fs: fix counting inline_data inode numbers

This patch fixes wrongly counting inline_data inode numbers.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>