truncate: use new helpers
Update some fs code to make use of new helper functions introduced
in the previous patch. Should be no significant change in behaviour
(except CIFS now calls send_sig under i_lock, via inode_newsize_ok).
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Miklos Szeredi <miklos@szeredi.hu>
Cc: linux-nfs@vger.kernel.org
Cc: Trond.Myklebust@netapp.com
Cc: linux-cifs-client@lists.samba.org
Cc: sfrench@samba.org
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/buffer.c b/fs/buffer.c
index 209f7f1..24afd74 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2239,16 +2239,10 @@
struct address_space *mapping = inode->i_mapping;
struct page *page;
void *fsdata;
- unsigned long limit;
int err;
- err = -EFBIG;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && size > (loff_t)limit) {
- send_sig(SIGXFSZ, current, 0);
- goto out;
- }
- if (size > inode->i_sb->s_maxbytes)
+ err = inode_newsize_ok(inode, size);
+ if (err)
goto out;
err = pagecache_write_begin(NULL, mapping, size, 0,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 1f09c76..5e24925 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1557,57 +1557,24 @@
static int cifs_vmtruncate(struct inode *inode, loff_t offset)
{
- struct address_space *mapping = inode->i_mapping;
- unsigned long limit;
+ loff_t oldsize;
+ int err;
spin_lock(&inode->i_lock);
- if (inode->i_size < offset)
- goto do_expand;
- /*
- * truncation of in-use swapfiles is disallowed - it would cause
- * subsequent swapout to scribble on the now-freed blocks.
- */
- if (IS_SWAPFILE(inode)) {
+ err = inode_newsize_ok(inode, offset);
+ if (err) {
spin_unlock(&inode->i_lock);
- goto out_busy;
+ goto out;
}
- i_size_write(inode, offset);
- spin_unlock(&inode->i_lock);
- /*
- * unmap_mapping_range is called twice, first simply for efficiency
- * so that truncate_inode_pages does fewer single-page unmaps. However
- * after this first call, and before truncate_inode_pages finishes,
- * it is possible for private pages to be COWed, which remain after
- * truncate_inode_pages finishes, hence the second unmap_mapping_range
- * call must be made for correctness.
- */
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- truncate_inode_pages(mapping, offset);
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- goto out_truncate;
-do_expand:
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && offset > limit) {
- spin_unlock(&inode->i_lock);
- goto out_sig;
- }
- if (offset > inode->i_sb->s_maxbytes) {
- spin_unlock(&inode->i_lock);
- goto out_big;
- }
+ oldsize = inode->i_size;
i_size_write(inode, offset);
spin_unlock(&inode->i_lock);
-out_truncate:
+ truncate_pagecache(inode, oldsize, offset);
if (inode->i_op->truncate)
inode->i_op->truncate(inode);
- return 0;
-out_sig:
- send_sig(SIGXFSZ, current, 0);
-out_big:
- return -EFBIG;
-out_busy:
- return -ETXTBSY;
+out:
+ return err;
}
static int
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index e703654..992f6c9 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1276,14 +1276,9 @@
return 0;
if (attr->ia_valid & ATTR_SIZE) {
- unsigned long limit;
- if (IS_SWAPFILE(inode))
- return -ETXTBSY;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && attr->ia_size > (loff_t) limit) {
- send_sig(SIGXFSZ, current, 0);
- return -EFBIG;
- }
+ err = inode_newsize_ok(inode, attr->ia_size);
+ if (err)
+ return err;
is_truncate = true;
}
@@ -1350,8 +1345,7 @@
* FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
*/
if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
- if (outarg.attr.size < oldsize)
- fuse_truncate(inode->i_mapping, outarg.attr.size);
+ truncate_pagecache(inode, oldsize, outarg.attr.size);
invalidate_inode_pages2(inode->i_mapping);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index fc9c79f..01cc462 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -606,8 +606,6 @@
void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
u64 attr_valid);
-void fuse_truncate(struct address_space *mapping, loff_t offset);
-
/**
* Initialize the client device
*/
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 6da947d..1a822ce 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -140,14 +140,6 @@
return 0;
}
-void fuse_truncate(struct address_space *mapping, loff_t offset)
-{
- /* See vmtruncate() */
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- truncate_inode_pages(mapping, offset);
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
-}
-
void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
u64 attr_valid)
{
@@ -205,8 +197,7 @@
spin_unlock(&fc->lock);
if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
- if (attr->size < oldsize)
- fuse_truncate(inode->i_mapping, attr->size);
+ truncate_pagecache(inode, oldsize, attr->size);
invalidate_inode_pages2(inode->i_mapping);
}
}
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 060022b..faa0918 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -458,49 +458,21 @@
*/
static int nfs_vmtruncate(struct inode * inode, loff_t offset)
{
- if (i_size_read(inode) < offset) {
- unsigned long limit;
+ loff_t oldsize;
+ int err;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && offset > limit)
- goto out_sig;
- if (offset > inode->i_sb->s_maxbytes)
- goto out_big;
- spin_lock(&inode->i_lock);
- i_size_write(inode, offset);
- spin_unlock(&inode->i_lock);
- } else {
- struct address_space *mapping = inode->i_mapping;
+ err = inode_newsize_ok(inode, offset);
+ if (err)
+ goto out;
- /*
- * truncation of in-use swapfiles is disallowed - it would
- * cause subsequent swapout to scribble on the now-freed
- * blocks.
- */
- if (IS_SWAPFILE(inode))
- return -ETXTBSY;
- spin_lock(&inode->i_lock);
- i_size_write(inode, offset);
- spin_unlock(&inode->i_lock);
+ spin_lock(&inode->i_lock);
+ oldsize = inode->i_size;
+ i_size_write(inode, offset);
+ spin_unlock(&inode->i_lock);
- /*
- * unmap_mapping_range is called twice, first simply for
- * efficiency so that truncate_inode_pages does fewer
- * single-page unmaps. However after this first call, and
- * before truncate_inode_pages finishes, it is possible for
- * private pages to be COWed, which remain after
- * truncate_inode_pages finishes, hence the second
- * unmap_mapping_range call must be made for correctness.
- */
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- truncate_inode_pages(mapping, offset);
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- }
- return 0;
-out_sig:
- send_sig(SIGXFSZ, current, 0);
-out_big:
- return -EFBIG;
+ truncate_pagecache(inode, oldsize, offset);
+out:
+ return err;
}
/**
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 11f0c06..32fae40 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -69,14 +69,11 @@
/* make various checks */
order = get_order(newsize);
if (unlikely(order >= MAX_ORDER))
- goto too_big;
+ return -EFBIG;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && newsize > limit)
- goto fsize_exceeded;
-
- if (newsize > inode->i_sb->s_maxbytes)
- goto too_big;
+ ret = inode_newsize_ok(inode, newsize);
+ if (ret)
+ return ret;
i_size_write(inode, newsize);
@@ -118,12 +115,7 @@
return 0;
- fsize_exceeded:
- send_sig(SIGXFSZ, current, 0);
- too_big:
- return -EFBIG;
-
- add_error:
+add_error:
while (loop < npages)
__free_page(pages + loop++);
return ret;
