ENUM POSITIVE_AOP_RE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux VFS

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NAMEenum_positive_aop_returns − aop return codes with specific semantics

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SYNOPSISenum positive_aop_returns { AOP_WRITEPAGE_ACTIVATE, AOP_TRUNCATED_PAGE };

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CONSTANTSAOP_WRITEPAGE_ACTIVATE Informs the caller that page writeback has completed, that the page is still locked, and should be considered active​. The VM uses this hint to return the page to the active list −− it won´t be a candidate for writeback again in the near future​. Other callers must be careful to unlock the page if they get this return​. Returned by writepage; AOP_TRUNCATED_PAGE The AOP method that was handed a locked page has unlocked it and the page might have been truncated​. The caller should back up to acquiring a new page and trying again​. The aop will be taking reasonable precautions not to livelock​. If the caller held a page reference, it should drop it before retrying​. Returned by readpage​.

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DESCRIPTIONaddress_space_operation functions return these large constants to indicate special semantics to the caller​. These are much larger than the bytes in a page to allow for functions that return the number of bytes operated on in a given page​.

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