fuse: truncate on spontaneous size change
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 <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 35e5cab..29fef75 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -980,23 +980,6 @@
}
}
-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 @@
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 @@
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 @@
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,
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 95c8a97..b584de3 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -109,20 +109,24 @@
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 @@
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)