Commit d3bccb6f authored by Jan Kara's avatar Jan Kara

vfs: Introduce filemap_fdatawait_range

This simple helper saves some filesystems conversion from byte offset
to page numbers and also makes the fdata* interface more complete.
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 86d71014
...@@ -2086,6 +2086,8 @@ extern int write_inode_now(struct inode *, int); ...@@ -2086,6 +2086,8 @@ extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *); extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *); extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *); extern int filemap_fdatawait(struct address_space *);
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
loff_t lend);
extern int filemap_write_and_wait(struct address_space *mapping); extern int filemap_write_and_wait(struct address_space *mapping);
extern int filemap_write_and_wait_range(struct address_space *mapping, extern int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend); loff_t lstart, loff_t lend);
......
...@@ -306,6 +306,26 @@ int wait_on_page_writeback_range(struct address_space *mapping, ...@@ -306,6 +306,26 @@ int wait_on_page_writeback_range(struct address_space *mapping,
return ret; return ret;
} }
/**
* filemap_fdatawait_range - wait for all under-writeback pages to complete in a given range
* @mapping: address space structure to wait for
* @start: offset in bytes where the range starts
* @end: offset in bytes where the range ends (inclusive)
*
* Walk the list of under-writeback pages of the given address space
* in the given range and wait for all of them.
*
* This is just a simple wrapper so that callers don't have to convert offsets
* to page indexes themselves
*/
int filemap_fdatawait_range(struct address_space *mapping, loff_t start,
loff_t end)
{
return wait_on_page_writeback_range(mapping, start >> PAGE_CACHE_SHIFT,
end >> PAGE_CACHE_SHIFT);
}
EXPORT_SYMBOL(filemap_fdatawait_range);
/** /**
* sync_page_range - write and wait on all pages in the passed range * sync_page_range - write and wait on all pages in the passed range
* @inode: target inode * @inode: target inode
......
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