The patch titled
tmpfs: convert to use the new truncate convention
has been added to the -mm tree. Its filename is
tmpfs-convert-to-use-the-new-truncate-convention.patch
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------------------------------------------------------
Subject: tmpfs: convert to use the new truncate convention
From: Nick Piggin <npiggin@xxxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Acked-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Dave Kleikamp <shaggy@xxxxxxxxxxxxxxxxxx>
Cc: Chris Mason <chris.mason@xxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxx>
Cc: Steven French <sfrench@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 44 +++++++++++++++++++++++---------------------
1 file changed, 23 insertions(+), 21 deletions(-)
diff -puN mm/shmem.c~tmpfs-convert-to-use-the-new-truncate-convention mm/shmem.c
--- a/mm/shmem.c~tmpfs-convert-to-use-the-new-truncate-convention
+++ a/mm/shmem.c
@@ -730,10 +730,11 @@ done2:
if (inode->i_mapping->nrpages && (info->flags & SHMEM_PAGEIN)) {
/*
* Call truncate_inode_pages again: racing shmem_unuse_inode
- * may have swizzled a page in from swap since vmtruncate or
- * generic_delete_inode did it, before we lowered next_index.
- * Also, though shmem_getpage checks i_size before adding to
- * cache, no recheck after: so fix the narrow window there too.
+ * may have swizzled a page in from swap since
+ * truncate_pagecache or generic_delete_inode did it, before we
+ * lowered next_index. Also, though shmem_getpage checks
+ * i_size before adding to cache, no recheck after: so fix the
+ * narrow window there too.
*
* Recalling truncate_inode_pages_range and unmap_mapping_range
* every time for punch_hole (which never got a chance to clear
@@ -763,19 +764,16 @@ done2:
}
}
-static void shmem_truncate(struct inode *inode)
-{
- shmem_truncate_range(inode, inode->i_size, (loff_t)-1);
-}
-
static int shmem_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
- struct page *page = NULL;
int error;
if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
- if (attr->ia_size < inode->i_size) {
+ loff_t newsize = attr->ia_size;
+ struct page *page = NULL;
+
+ if (newsize < inode->i_size) {
/*
* If truncating down to a partial page, then
* if that page is already allocated, hold it
@@ -783,9 +781,9 @@ static int shmem_notify_change(struct de
* truncate_partial_page cannnot miss it were
* it assigned to swap.
*/
- if (attr->ia_size & (PAGE_CACHE_SIZE-1)) {
+ if (newsize & (PAGE_CACHE_SIZE-1)) {
(void) shmem_getpage(inode,
- attr->ia_size>>PAGE_CACHE_SHIFT,
+ newsize >> PAGE_CACHE_SHIFT,
&page, SGP_READ, NULL);
if (page)
unlock_page(page);
@@ -797,24 +795,29 @@ static int shmem_notify_change(struct de
* if it's being fully truncated to zero-length: the
* nrpages check is efficient enough in that case.
*/
- if (attr->ia_size) {
+ if (newsize) {
struct shmem_inode_info *info = SHMEM_I(inode);
spin_lock(&info->lock);
info->flags &= ~SHMEM_PAGEIN;
spin_unlock(&info->lock);
}
}
+
+ error = simple_setsize(inode, newsize);
+ if (page)
+ page_cache_release(page);
+ if (error)
+ return error;
+ shmem_truncate_range(inode, newsize, (loff_t)-1);
}
error = inode_change_ok(inode, attr);
if (!error)
- error = inode_setattr(inode, attr);
+ generic_setattr(inode, attr);
#ifdef CONFIG_TMPFS_POSIX_ACL
if (!error && (attr->ia_valid & ATTR_MODE))
error = generic_acl_chmod(inode, &shmem_acl_ops);
#endif
- if (page)
- page_cache_release(page);
return error;
}
@@ -822,11 +825,11 @@ static void shmem_delete_inode(struct in
{
struct shmem_inode_info *info = SHMEM_I(inode);
- if (inode->i_op->truncate == shmem_truncate) {
+ if (inode->i_mapping->a_ops == &shmem_aops) {
truncate_inode_pages(inode->i_mapping, 0);
shmem_unacct_size(info->flags, inode->i_size);
inode->i_size = 0;
- shmem_truncate(inode);
+ shmem_truncate_range(inode, 0, (loff_t)-1);
if (!list_empty(&info->swaplist)) {
mutex_lock(&shmem_swaplist_mutex);
list_del_init(&info->swaplist);
@@ -2018,7 +2021,6 @@ static const struct inode_operations shm
};
static const struct inode_operations shmem_symlink_inode_operations = {
- .truncate = shmem_truncate,
.readlink = generic_readlink,
.follow_link = shmem_follow_link,
.put_link = shmem_put_link,
@@ -2438,7 +2440,7 @@ static const struct file_operations shme
};
static const struct inode_operations shmem_inode_operations = {
- .truncate = shmem_truncate,
+ .new_truncate = 1,
.setattr = shmem_notify_change,
.truncate_range = shmem_truncate_range,
#ifdef CONFIG_TMPFS_POSIX_ACL
_
Patches currently in -mm which might be from npiggin@xxxxxxx are
origin.patch
linux-next.patch
fs-new-truncate-helpers.patch
fs-use-new-truncate-helpers.patch
fs-introduce-new-truncate-sequence.patch
fs-convert-simple-fs-to-new-truncate.patch
tmpfs-convert-to-use-the-new-truncate-convention.patch
ext2-convert-to-use-the-new-truncate-convention.patch
fat-convert-to-use-the-new-truncate-convention.patch
btrfs-convert-to-use-the-new-truncate-convention.patch
jfs-convert-to-use-the-new-truncate-convention.patch
udf-convert-to-use-the-new-truncate-convention.patch
minix-convert-to-use-the-new-truncate-convention.patch
ksm-no-debug-in-page_dup_rmap.patch
fs-turn-iprune_mutex-into-rwsem.patch
reiser4.patch
fs-symlink-write_begin-allocation-context-fix-reiser4-fix.patch
--
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