From: Jason Hrycay Date: Tue, 9 Apr 2013 01:16:44 +0000 (-0500) Subject: f2fs: move f2fs_balance_fs from truncate to punch_hole X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1127a3d448bcf4de338e60a7cc695d54c5767433;p=openwrt%2Fstaging%2Fblogic.git f2fs: move f2fs_balance_fs from truncate to punch_hole Move the f2fs_balance_fs out of the truncate_hole function and only perform that in punch_hole use case. The commit: ed60b1644e7f7e5dd67d21caf7e4425dff05dad0 intended to do this but moved it into truncate_hole to cover more cases. However, a deadlock scenario is possible when deleting an inode entry under specific conditions: f2fs_delete_entry() mutex_lock_op(sbi, DENTRY_OPS); truncate_hole() f2fs_balance_fs() mutex_lock(&sbi->gc_mutex); f2fs_gc() write_checkpoint() block_operations() mutex_lock_op(sbi, DENTRY_OPS); Lets move it into the punch_hole case to cover the original intent of avoiding it during fallocate's expand_inode_data case. Change-Id: I29f8ea1056b0b88b70ba8652d901b6e8431bb27e Signed-off-by: Jason Hrycay Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index e031f570df79..155b362dad63 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -390,8 +390,6 @@ int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) struct dnode_of_data dn; struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); - f2fs_balance_fs(sbi); - mutex_lock_op(sbi, DATA_TRUNC); set_new_dnode(&dn, inode, NULL, NULL, 0); err = get_dnode_of_data(&dn, index, LOOKUP_NODE); @@ -435,6 +433,9 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode) if (pg_start < pg_end) { struct address_space *mapping = inode->i_mapping; loff_t blk_start, blk_end; + struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); + + f2fs_balance_fs(sbi); blk_start = pg_start << PAGE_CACHE_SHIFT; blk_end = pg_end << PAGE_CACHE_SHIFT;