From: Miklos Szeredi <[email protected]>
Memory mappings were only truncated on an explicit truncate, but not
when the file size was changed externally.
Fix this by moving the truncation code from fuse_setattr to
fuse_change_attributes.
Yes, there are races between write and and external truncation, but we
can't really do anything about them.
Signed-off-by: Miklos Szeredi <[email protected]>
---
Index: linux/fs/fuse/dir.c
===================================================================
--- linux.orig/fs/fuse/dir.c 2007-08-03 17:54:55.000000000 +0200
+++ linux/fs/fuse/dir.c 2007-08-03 17:54:55.000000000 +0200
@@ -980,23 +980,6 @@ static void iattr_to_fattr(struct iattr
}
}
-static void fuse_vmtruncate(struct inode *inode, loff_t offset)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
- int need_trunc;
-
- spin_lock(&fc->lock);
- need_trunc = inode->i_size > offset;
- i_size_write(inode, offset);
- spin_unlock(&fc->lock);
-
- if (need_trunc) {
- struct address_space *mapping = inode->i_mapping;
- unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
- truncate_inode_pages(mapping, offset);
- }
-}
-
/*
* Set attributes, and at the same time refresh them.
*
@@ -1014,7 +997,6 @@ static int fuse_setattr(struct dentry *e
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
int err;
- int is_truncate = 0;
if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
err = inode_change_ok(inode, attr);
@@ -1024,7 +1006,6 @@ static int fuse_setattr(struct dentry *e
if (attr->ia_valid & ATTR_SIZE) {
unsigned long limit;
- is_truncate = 1;
if (IS_SWAPFILE(inode))
return -ETXTBSY;
limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
@@ -1051,21 +1032,20 @@ static int fuse_setattr(struct dentry *e
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
- if (!err) {
- if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
- make_bad_inode(inode);
- err = -EIO;
- } else {
- if (is_truncate)
- fuse_vmtruncate(inode, outarg.attr.size);
- fuse_change_attributes(inode, &outarg.attr);
- fi->i_time = time_to_jiffies(outarg.attr_valid,
- outarg.attr_valid_nsec);
- }
- } else if (err == -EINTR)
- fuse_invalidate_attr(inode);
+ if (err) {
+ if (err == -EINTR)
+ fuse_invalidate_attr(inode);
+ return err;
+ }
- return err;
+ if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
+ make_bad_inode(inode);
+ return -EIO;
+ }
+
+ fuse_change_attributes(inode, &outarg.attr);
+ fi->i_time = time_to_jiffies(outarg.attr_valid, outarg.attr_valid_nsec);
+ return 0;
}
static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
Index: linux/fs/fuse/inode.c
===================================================================
--- linux.orig/fs/fuse/inode.c 2007-08-03 17:54:54.000000000 +0200
+++ linux/fs/fuse/inode.c 2007-08-03 17:54:55.000000000 +0200
@@ -109,20 +109,24 @@ static int fuse_remount_fs(struct super_
return 0;
}
+static 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(struct inode *inode, struct fuse_attr *attr)
{
struct fuse_conn *fc = get_fuse_conn(inode);
- if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
- invalidate_mapping_pages(inode->i_mapping, 0, -1);
+ loff_t oldsize;
inode->i_ino = attr->ino;
inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
inode->i_nlink = attr->nlink;
inode->i_uid = attr->uid;
inode->i_gid = attr->gid;
- spin_lock(&fc->lock);
- i_size_write(inode, attr->size);
- spin_unlock(&fc->lock);
inode->i_blocks = attr->blocks;
inode->i_atime.tv_sec = attr->atime;
inode->i_atime.tv_nsec = attr->atimensec;
@@ -130,6 +134,17 @@ void fuse_change_attributes(struct inode
inode->i_mtime.tv_nsec = attr->mtimensec;
inode->i_ctime.tv_sec = attr->ctime;
inode->i_ctime.tv_nsec = attr->ctimensec;
+
+ spin_lock(&fc->lock);
+ oldsize = inode->i_size;
+ i_size_write(inode, attr->size);
+ spin_unlock(&fc->lock);
+
+ if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
+ if (attr->size < oldsize)
+ fuse_truncate(inode->i_mapping, attr->size);
+ invalidate_mapping_pages(inode->i_mapping, 0, -1);
+ }
}
static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
--
-
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