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Yongqiang Yang authored
ext4_journal_start_sb() should not prevent an active handle from being started due to s_frozen. Otherwise, deadlock is easy to happen, below is a situation. ================================================ freeze | truncate ================================================ | ext4_ext_truncate() freeze_super() | starts a handle sets s_frozen | | ext4_ext_truncate() | holds i_data_sem ext4_freeze() | waits for updates | | ext4_free_blocks() | calls dquot_free_block() | | dquot_free_blocks() | calls ext4_dirty_inode() | | ext4_dirty_inode() | trys to start an active | handle | | block due to s_frozen ================================================ Signed-off-by:
Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by:
"Theodore Ts'o" <tytso@mit.edu> Reported-by:
Amir Goldstein <amir73il@users.sf.net> Reviewed-by:
Jan Kara <jack@suse.cz> Reviewed-by:
Andreas Dilger <adilger@dilger.ca>
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