ext4: discard preallocation when restarting a transaction during truncate
When restart a transaction during a truncate operation, we drop and reacquire i_data_sem. After reacquiring i_data_sem, we need to discard any inode-based preallocation that might have been grabbed while we released i_data_sem (for example, if pdflush is allocating blocks and racing against the truncate). Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -193,7 +193,7 @@ static int try_to_extend_transaction(handle_t *handle, struct inode *inode)
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* so before we call here everything must be consistently dirtied against
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* this transaction.
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*/
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int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode,
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int ext4_truncate_restart_trans(handle_t *handle, struct inode *inode,
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int nblocks)
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{
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int ret;
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@ -209,6 +209,7 @@ static int try_to_extend_transaction(handle_t *handle, struct inode *inode)
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up_write(&EXT4_I(inode)->i_data_sem);
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ret = ext4_journal_restart(handle, blocks_for_truncate(inode));
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down_write(&EXT4_I(inode)->i_data_sem);
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ext4_discard_preallocations(inode);
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return ret;
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}
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