Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\filemap.c Create Date:2022-07-28 14:01:48
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name:d_lock_entry - locate, pin and lock a page cache entry*@mapping: the address_space to search*@offset: the page cache index* Looks up the page cache slot at @mapping & @offset. If there is a* page cache page, it is returned locked and with an increased

Proto:struct page *find_lock_entry(struct address_space *mapping, unsigned long offset)

Type:struct page

Parameter:

TypeParameterName
struct address_space *mapping
unsigned longoffset
1583  repeat :
1584  page = d_get_entry - find and get a page cache entry*@mapping: the address_space to search*@offset: the page cache index* Looks up the page cache slot at @mapping & @offset
1585  If page && Not xa_is_value() - Determine if an entry is a value.*@entry: XArray entry.* Context: Any context.* Return: True if the entry is a value, false if it is a pointer. Then
1586  lock_page may only be called if we have the page's inode pinned.
1588  If Value for the false possibility is greater at compile time(page_mapping(page) != mapping) Then
1589  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
1590  put_page(page)
1591  Go to repeat
1593  VM_BUG_ON_PAGE(Get the offset in PAGE_SIZE.* (TODO: hugepage should have ->index in PAGE_SIZE) != offset, page)
1595  Return page