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fuse: fix fsync on directory

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Commit ab2257e994 ("fuse: reduce size of struct fuse_inode") moved parts
of fields related to writeback on regular file and to directory caching
into a union.  However fuse_fsync_common() called from fuse_dir_fsync()
touches some writeback related fields, resulting in a crash.

Move writeback related parts from fuse_fsync_common() to fuse_fysnc().

Reported-by: Brett Girton <btgirton@gmail.com>
Tested-by: Brett Girton <btgirton@gmail.com>
Fixes: ab2257e994 ("fuse: reduce size of struct fuse_inode")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2018-12-03 10:14:43 +01:00
parent 4fc4bb796b
commit a9c2d1e82f
3 changed files with 42 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
fs/fuse/dir.c
View file

@ -1249,7 +1249,25 @@ static int fuse_dir_release(struct inode *inode, struct file *file)
static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
int datasync)
{
return fuse_fsync_common(file, start, end, datasync, 1);
struct inode *inode = file->f_mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
if (is_bad_inode(inode))
return -EIO;
if (fc->no_fsyncdir)
return 0;
inode_lock(inode);
err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR);
if (err == -ENOSYS) {
fc->no_fsyncdir = 1;
err = 0;
}
inode_unlock(inode);
return err;
}
static long fuse_dir_ioctl(struct file *file, unsigned int cmd,

43
fs/fuse/file.c
View file

@ -441,13 +441,30 @@ static int fuse_flush(struct file *file, fl_owner_t id)
}
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
int datasync, int isdir)
int datasync, int opcode)
{
struct inode *inode = file->f_mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
FUSE_ARGS(args);
struct fuse_fsync_in inarg;
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
inarg.fsync_flags = datasync ? 1 : 0;
args.in.h.opcode = opcode;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
return fuse_simple_request(fc, &args);
}
static int fuse_fsync(struct file *file, loff_t start, loff_t end,
int datasync)
{
struct inode *inode = file->f_mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
if (is_bad_inode(inode))
@ -479,34 +496,18 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
if (err)
goto out;
if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
if (fc->no_fsync)
goto out;
memset(&inarg, 0, sizeof(inarg));
inarg.fh = ff->fh;
inarg.fsync_flags = datasync ? 1 : 0;
args.in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
err = fuse_simple_request(fc, &args);
err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNC);
if (err == -ENOSYS) {
if (isdir)
fc->no_fsyncdir = 1;
else
fc->no_fsync = 1;
fc->no_fsync = 1;
err = 0;
}
out:
inode_unlock(inode);
return err;
}
static int fuse_fsync(struct file *file, loff_t start, loff_t end,
int datasync)
{
return fuse_fsync_common(file, start, end, datasync, 0);
return err;
}
void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,

2
fs/fuse/fuse_i.h
View file

@ -828,7 +828,7 @@ void fuse_release_common(struct file *file, int opcode);
* Send FSYNC or FSYNCDIR request
*/
int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
int datasync, int isdir);
int datasync, int opcode);
/**
* Notify poll wakeup