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ext4: fix error handling in ext4_ext_truncate()
Previously ext4_ext_truncate() was ignoring potential error returns from ext4_es_remove_extent() and ext4_ext_remove_space(). This can lead to the on-diks extent tree and the extent status tree cache getting out of sync, which is particuarlly bad, and can lead to file system corruption and potential data loss. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
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@ -4405,9 +4405,20 @@ void ext4_ext_truncate(handle_t *handle, struct inode *inode)
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last_block = (inode->i_size + sb->s_blocksize - 1)
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>> EXT4_BLOCK_SIZE_BITS(sb);
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retry:
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err = ext4_es_remove_extent(inode, last_block,
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EXT_MAX_BLOCKS - last_block);
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if (err == ENOMEM) {
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cond_resched();
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congestion_wait(BLK_RW_ASYNC, HZ/50);
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goto retry;
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}
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if (err) {
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ext4_std_error(inode->i_sb, err);
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return;
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}
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err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
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ext4_std_error(inode->i_sb, err);
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}
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static void ext4_falloc_update_inode(struct inode *inode,
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