diff options
| author | Pavel Emelyanov <xemul@openvz.org> | 2013-10-10 17:10:46 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2014-04-02 17:38:48 +0400 |
| commit | 8373200b124d03de7fa2e99be56de8642e604e9e (patch) | |
| tree | 853b6590ced17b0449883093350bf681e5e9cbd7 /fs/fuse/dir.c | |
| parent | d5cd66c58edf10a7ee786659994595fd43995aab (diff) | |
| download | linux-8373200b124d03de7fa2e99be56de8642e604e9e.tar.xz | |
fuse: Trust kernel i_size only
Make fuse think that when writeback is on the inode's i_size is always
up-to-date and not update it with the value received from the userspace.
This is done because the page cache code may update i_size without letting
the FS know.
This assumption implies fixing the previously introduced short-read helper --
when a short read occurs the 'hole' is filled with zeroes.
fuse_file_fallocate() is also fixed because now we should keep i_size up to
date, so it must be updated if FUSE_FALLOCATE request succeeded.
Signed-off-by: Maxim V. Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/dir.c')
| -rw-r--r-- | fs/fuse/dir.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 1d1292c581c3..c52f143da9ad 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -839,6 +839,11 @@ static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr, struct kstat *stat) { unsigned int blkbits; + struct fuse_conn *fc = get_fuse_conn(inode); + + /* see the comment in fuse_change_attributes() */ + if (fc->writeback_cache && S_ISREG(inode->i_mode)) + attr->size = i_size_read(inode); stat->dev = inode->i_sb->s_dev; stat->ino = attr->ino; @@ -1580,6 +1585,7 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, struct fuse_setattr_in inarg; struct fuse_attr_out outarg; bool is_truncate = false; + bool is_wb = fc->writeback_cache; loff_t oldsize; int err; @@ -1651,7 +1657,9 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, fuse_change_attributes_common(inode, &outarg.attr, attr_timeout(&outarg)); oldsize = inode->i_size; - i_size_write(inode, outarg.attr.size); + /* see the comment in fuse_change_attributes() */ + if (!is_wb || is_truncate || !S_ISREG(inode->i_mode)) + i_size_write(inode, outarg.attr.size); if (is_truncate) { /* NOTE: this may release/reacquire fc->lock */ @@ -1663,7 +1671,8 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr, * Only call invalidate_inode_pages2() after removing * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock. */ - if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { + if ((is_truncate || !is_wb) && + S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) { truncate_pagecache(inode, outarg.attr.size); invalidate_inode_pages2(inode->i_mapping); } |