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Commit 4631dbf6 authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Theodore Ts'o
Browse files

ext4: move i_size,i_disksize update routines to helper function 



Cc: stable@vger.kernel.org # needed for bug fix patches
Signed-off-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent c99d1e6e

fs/ext4/ext4.h

+16 −0
Original line number Diff line number Diff line
@@ -2454,6 +2454,22 @@ static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 
	up_write(&EXT4_I(inode)->i_data_sem);

}



/* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */

static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)

{

	int changed = 0;



	if (newsize > inode->i_size) {

		i_size_write(inode, newsize);

		changed = 1;

	}

	if (newsize > EXT4_I(inode)->i_disksize) {

		ext4_update_i_disksize(inode, newsize);

		changed |= 2;

	}

	return changed;

}



struct ext4_group_info {

	unsigned long   bb_state;

	struct rb_root  bb_free_root;

fs/ext4/extents.c

+4 −13
Original line number Diff line number Diff line
@@ -4839,12 +4839,8 @@ static long ext4_zero_range(struct file *file, loff_t offset, 
	}



	inode->i_mtime = inode->i_ctime = ext4_current_time(inode);



	if (new_size) {

		if (new_size > i_size_read(inode))

			i_size_write(inode, new_size);

		if (new_size > EXT4_I(inode)->i_disksize)

			ext4_update_i_disksize(inode, new_size);

		ext4_update_inode_size(inode, new_size);

	} else {

		/*

		* Mark that we allocate beyond EOF so the subsequent truncate
@@ -4886,7 +4882,6 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) 
	int ret = 0;

	int flags;

	ext4_lblk_t lblk;

	struct timespec tv;

	unsigned int blkbits = inode->i_blkbits;



	/* Return error if mode is not supported */
@@ -4945,15 +4940,11 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) 
	if (IS_ERR(handle))

		goto out;



	tv = inode->i_ctime = ext4_current_time(inode);

	inode->i_ctime = ext4_current_time(inode);



	if (new_size) {

		if (new_size > i_size_read(inode)) {

			i_size_write(inode, new_size);

			inode->i_mtime = tv;

		}

		if (new_size > EXT4_I(inode)->i_disksize)

			ext4_update_i_disksize(inode, new_size);

		if (ext4_update_inode_size(inode, new_size) & 0x1)

			inode->i_mtime = inode->i_ctime;

	} else {

		/*

		* Mark that we allocate beyond EOF so the subsequent truncate

fs/ext4/inode.c

+8 −26
Original line number Diff line number Diff line
@@ -1055,27 +1055,11 @@ static int ext4_write_end(struct file *file, 
	} else

		copied = block_write_end(file, mapping, pos,

					 len, copied, page, fsdata);



	/*

	 * No need to use i_size_read() here, the i_size

	 * cannot change under us because we hole i_mutex.

	 *

	 * But it's important to update i_size while still holding page lock:

	 * it's important to update i_size while still holding page lock:

	 * page writeout could otherwise come in and zero beyond i_size.

	 */

	if (pos + copied > inode->i_size) {

		i_size_write(inode, pos + copied);

		i_size_changed = 1;

	}



	if (pos + copied > EXT4_I(inode)->i_disksize) {

		/* We need to mark inode dirty even if

		 * new_i_size is less that inode->i_size

		 * but greater than i_disksize. (hint delalloc)

		 */

		ext4_update_i_disksize(inode, (pos + copied));

		i_size_changed = 1;

	}

	i_size_changed = ext4_update_inode_size(inode, pos + copied);

	unlock_page(page);

	page_cache_release(page);
@@ -1123,7 +1107,7 @@ static int ext4_journalled_write_end(struct file *file, 
	int ret = 0, ret2;

	int partial = 0;

	unsigned from, to;

	loff_t new_i_size;

	int size_changed = 0;



	trace_ext4_journalled_write_end(inode, pos, len, copied);

	from = pos & (PAGE_CACHE_SIZE - 1);
@@ -1146,20 +1130,18 @@ static int ext4_journalled_write_end(struct file *file, 
		if (!partial)

			SetPageUptodate(page);

	}

	new_i_size = pos + copied;

	if (new_i_size > inode->i_size)

		i_size_write(inode, pos+copied);

	size_changed = ext4_update_inode_size(inode, pos + copied);

	ext4_set_inode_state(inode, EXT4_STATE_JDATA);

	EXT4_I(inode)->i_datasync_tid = handle->h_transaction->t_tid;

	if (new_i_size > EXT4_I(inode)->i_disksize) {

		ext4_update_i_disksize(inode, new_i_size);

	unlock_page(page);

	page_cache_release(page);



	if (size_changed) {

		ret2 = ext4_mark_inode_dirty(handle, inode);

		if (!ret)

			ret = ret2;

	}



	unlock_page(page);

	page_cache_release(page);

	if (pos + len > inode->i_size && ext4_can_truncate(inode))

		/* if we have allocated more blocks and copied

		 * less. We will have blocks allocated outside