table of contents
| ENUM POSITIVE_AOP_RE(9) | The Linux VFS | ENUM POSITIVE_AOP_RE(9) |
NAME¶
enum_positive_aop_returns - aop return codes with specific semantics
SYNOPSIS¶
enum positive_aop_returns {
AOP_WRITEPAGE_ACTIVATE,
AOP_TRUNCATED_PAGE
};
CONSTANTS¶
AOP_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.
DESCRIPTION¶
address_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.
COPYRIGHT¶
| May 2024 | Kernel Hackers Manual 2.6. |