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implement simple fs aops

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Implement new aops for some of the simpler filesystems.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
2007-10-16 01:25:03 -07:00
committed by Linus Torvalds
parent 674b892ede
commit 800d15a53e
6 changed files with 45 additions and 21 deletions
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34
mm/shmem.c
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@@ -1108,7 +1108,7 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
* Normally, filepage is NULL on entry, and either found
* uptodate immediately, or allocated and zeroed, or read
* in under swappage, which is then assigned to filepage.
* But shmem_readpage and shmem_prepare_write pass in a locked
* But shmem_readpage and shmem_write_begin pass in a locked
* filepage, which may be found not uptodate by other callers
* too, and may need to be copied from the swappage read in.
*/
@@ -1445,7 +1445,7 @@ static const struct inode_operations shmem_symlink_inode_operations;
static const struct inode_operations shmem_symlink_inline_operations;
/*
* Normally tmpfs avoids the use of shmem_readpage and shmem_prepare_write;
* Normally tmpfs avoids the use of shmem_readpage and shmem_write_begin;
* but providing them allows a tmpfs file to be used for splice, sendfile, and
* below the loop driver, in the generic fashion that many filesystems support.
*/
@@ -1458,10 +1458,30 @@ static int shmem_readpage(struct file *file, struct page *page)
}
static int
shmem_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
shmem_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
struct inode *inode = page->mapping->host;
return shmem_getpage(inode, page->index, &page, SGP_WRITE, NULL);
struct inode *inode = mapping->host;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
*pagep = NULL;
return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
}
static int
shmem_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
set_page_dirty(page);
page_cache_release(page);
if (pos+copied > inode->i_size)
i_size_write(inode, pos+copied);
return copied;
}
static ssize_t
@@ -2337,8 +2357,8 @@ static const struct address_space_operations shmem_aops = {
.set_page_dirty = __set_page_dirty_no_writeback,
#ifdef CONFIG_TMPFS
.readpage = shmem_readpage,
.prepare_write = shmem_prepare_write,
.commit_write = simple_commit_write,
.write_begin = shmem_write_begin,
.write_end = shmem_write_end,
#endif
.migratepage = migrate_page,
};