Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

hostfs: Allow fsync on directories

Browse source 
Historically hostfs did not open directories on the host filesystem
for performance and memory reasons.
But it turned out that this optimization has a drawback.
Calling fsync() on a hostfs directory returns immediately
with -EINVAL as fsync is not implemented.
While this is behavior is strictly speaking correct common userspace
like dpkg(1) stumbles over that and makes it impossible to use
hostfs as root filesystem.
The fix is easy, wire up the existing host open/fsync functions
to the directory file operations.

Reported-by: Daniel Gröber <dxld@darkboxed.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2015-03-02 00:09:33 +01:00
parent af9556586a
commit 4c6dcafc69
1 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
fs/hostfs/hostfs_kern.c
View file

@ -295,7 +295,7 @@ static int hostfs_readdir(struct file *file, struct dir_context *ctx)
return 0; return 0;
} }
static int hostfs_file_open(struct inode *ino, struct file *file) static int hostfs_open(struct inode *ino, struct file *file)
{ {
char *name; char *name;
fmode_t mode = 0; fmode_t mode = 0;
@ -386,7 +386,7 @@ static const struct file_operations hostfs_file_fops = {
.write_iter = generic_file_write_iter, .write_iter = generic_file_write_iter,
.write = new_sync_write, .write = new_sync_write,
.mmap = generic_file_mmap, .mmap = generic_file_mmap,
.open = hostfs_file_open, .open = hostfs_open,
.release = hostfs_file_release, .release = hostfs_file_release,
.fsync = hostfs_fsync, .fsync = hostfs_fsync,
}; };
@ -395,6 +395,8 @@ static const struct file_operations hostfs_dir_fops = {
.llseek = generic_file_llseek, .llseek = generic_file_llseek,
.iterate = hostfs_readdir, .iterate = hostfs_readdir,
.read = generic_read_dir, .read = generic_read_dir,
.open = hostfs_open,
.fsync = hostfs_fsync,
}; };
static int hostfs_writepage(struct page *page, struct writeback_control *wbc) static int hostfs_writepage(struct page *page, struct writeback_control *wbc)