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fs: restore nobh

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Implement nobh in new aops.  This is a bit tricky.  FWIW, nobh_truncate is
now implemented in a way that does not create blocks in sparse regions,
which is a silly thing for it to have been doing (isn't it?)

ext2 survives fsx and fsstress. jfs is converted as well... ext3
should be easy to do (but not done yet).

[akpm@linux-foundation.org: coding-style fixes]
Cc: Badari Pulavarty <pbadari@us.ibm.com>
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 01:25:25 -07:00
committed by Linus Torvalds
parent b6af1bcd87
commit 03158cd7eb
4 changed files with 178 additions and 88 deletions
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20
fs/ext2/inode.c
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@@ -659,6 +659,20 @@ ext2_write_begin(struct file *file, struct address_space *mapping,
return __ext2_write_begin(file, mapping, pos, len, flags, pagep,fsdata);
}
static int
ext2_nobh_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
/*
* Dir-in-pagecache still uses ext2_write_begin. Would have to rework
* directory handling code to pass around offsets rather than struct
* pages in order to make this work easily.
*/
return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
ext2_get_block);
}
static int ext2_nobh_writepage(struct page *page,
struct writeback_control *wbc)
{
@@ -710,7 +724,8 @@ const struct address_space_operations ext2_nobh_aops = {
.readpages = ext2_readpages,
.writepage = ext2_nobh_writepage,
.sync_page = block_sync_page,
/* XXX: todo */
.write_begin = ext2_nobh_write_begin,
.write_end = nobh_write_end,
.bmap = ext2_bmap,
.direct_IO = ext2_direct_IO,
.writepages = ext2_writepages,
@@ -927,7 +942,8 @@ void ext2_truncate (struct inode * inode)
if (mapping_is_xip(inode->i_mapping))
xip_truncate_page(inode->i_mapping, inode->i_size);
else if (test_opt(inode->i_sb, NOBH))
nobh_truncate_page(inode->i_mapping, inode->i_size);
nobh_truncate_page(inode->i_mapping,
inode->i_size, ext2_get_block);
else
block_truncate_page(inode->i_mapping,
inode->i_size, ext2_get_block);