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f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc

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The f2fs_gc() called by f2fs_balance_fs() requires to be called outside of
fi->i_gc_rwsem[WRITE], since f2fs_gc() can try to grab it in a loop.

If it hits the miximum retrials in GC, let's give a chance to release
gc_mutex for a short time in order not to go into live lock in the worst
case.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2018-07-25 12:11:56 +09:00
parent 853137cef4
commit 6f8d445506
6 changed files with 92 additions and 68 deletions
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6
fs/f2fs/segment.c
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@@ -445,8 +445,10 @@ int f2fs_commit_inmem_pages(struct inode *inode)
int err;
f2fs_balance_fs(sbi, true);
f2fs_lock_op(sbi);
down_write(&fi->i_gc_rwsem[WRITE]);
f2fs_lock_op(sbi);
set_inode_flag(inode, FI_ATOMIC_COMMIT);
mutex_lock(&fi->inmem_lock);
@@ -461,6 +463,8 @@ int f2fs_commit_inmem_pages(struct inode *inode)
clear_inode_flag(inode, FI_ATOMIC_COMMIT);
f2fs_unlock_op(sbi);
up_write(&fi->i_gc_rwsem[WRITE]);
return err;
}