Btrfs: fix lockdep warning about log_mutex
While checking INODE_REF/INODE_EXTREF for a corner case, we may acquire a different inode's log_mutex with holding the current inode's log_mutex, and lockdep has complained this with a possilble deadlock warning. Fix this by using mutex_lock_nested() when processing the other inode's log_mutex. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -37,6 +37,7 @@
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*/
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#define LOG_INODE_ALL 0
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#define LOG_INODE_EXISTS 1
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#define LOG_OTHER_INODE 2
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/*
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* directory trouble cases
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@ -4641,7 +4642,7 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
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if (S_ISDIR(inode->i_mode) ||
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(!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
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&BTRFS_I(inode)->runtime_flags) &&
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inode_only == LOG_INODE_EXISTS))
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inode_only >= LOG_INODE_EXISTS))
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max_key.type = BTRFS_XATTR_ITEM_KEY;
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else
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max_key.type = (u8)-1;
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@ -4665,7 +4666,13 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
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return ret;
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}
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if (inode_only == LOG_OTHER_INODE) {
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inode_only = LOG_INODE_EXISTS;
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mutex_lock_nested(&BTRFS_I(inode)->log_mutex,
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SINGLE_DEPTH_NESTING);
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} else {
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mutex_lock(&BTRFS_I(inode)->log_mutex);
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}
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/*
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* a brute force approach to making sure we get the most uptodate
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@ -4817,7 +4824,7 @@ again:
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* unpin it.
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*/
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err = btrfs_log_inode(trans, root, other_inode,
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LOG_INODE_EXISTS,
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LOG_OTHER_INODE,
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0, LLONG_MAX, ctx);
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iput(other_inode);
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if (err)
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