To make possible proper work of `ufs_truncate'(see the next patch),
I need to know old size of file in` ufs_truncate',
but for some unknown for me reason VFS layer doesn't tell
old size to file system, or at least I don't find way to get
this information.
So I have to add per each inode `loff_t' field and update it
in
- alloc inode
- read inode
- commit write
- truncate(see the next patch)
is this right way to know "old size" in truncate method?
Signed-off-by: Evgeniy Dushistov <dushistov@xxxxxxx>
---
Index: linux-2.6.17-mm2/fs/ufs/ialloc.c
===================================================================
--- linux-2.6.17-mm2.orig/fs/ufs/ialloc.c
+++ linux-2.6.17-mm2/fs/ufs/ialloc.c
@@ -265,6 +265,7 @@ cg_found:
ufsi->i_osync = 0;
ufsi->i_oeftflag = 0;
ufsi->i_dir_start_lookup = 0;
+ ufsi->i_size = 0;
memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1));
insert_inode_hash(inode);
Index: linux-2.6.17-mm2/fs/ufs/inode.c
===================================================================
--- linux-2.6.17-mm2.orig/fs/ufs/inode.c
+++ linux-2.6.17-mm2/fs/ufs/inode.c
@@ -574,12 +574,25 @@ static sector_t ufs_bmap(struct address_
{
return generic_block_bmap(mapping,block,ufs_getfrag_block);
}
+
+/*
+ * we have to update our internal i_size holder,
+ * because of we want know old size in truncate
+ */
+static int ufs_commit_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ UFS_I(page->mapping->host)->i_size =
+ ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+ return generic_commit_write(file, page, from, to);
+}
+
const struct address_space_operations ufs_aops = {
.readpage = ufs_readpage,
.writepage = ufs_writepage,
.sync_page = block_sync_page,
.prepare_write = ufs_prepare_write,
- .commit_write = generic_commit_write,
+ .commit_write = ufs_commit_write,
.bmap = ufs_bmap
};
@@ -738,6 +751,7 @@ void ufs_read_inode(struct inode * inode
(inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
ufsi->i_dir_start_lookup = 0;
ufsi->i_osync = 0;
+ ufsi->i_size = inode->i_size;
ufs_set_inode_ops(inode);
Index: linux-2.6.17-mm2/include/linux/ufs_fs_i.h
===================================================================
--- linux-2.6.17-mm2.orig/include/linux/ufs_fs_i.h
+++ linux-2.6.17-mm2/include/linux/ufs_fs_i.h
@@ -28,6 +28,7 @@ struct ufs_inode_info {
__u16 i_osync;
__u32 i_lastfrag;
__u32 i_dir_start_lookup;
+ loff_t i_size;
struct inode vfs_inode;
};
--
/Evgeniy
-
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