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| author | Miklos Szeredi <mszeredi@suse.cz> | 2009-04-02 14:25:35 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2009-04-02 14:25:35 +0200 |
| commit | fc280c9692031ee41545d6bea00bbb7c7dec97a9 (patch) | |
| tree | bff08b2710b2086698736d66cef403c6e2975ca9 /fs/fuse | |
| parent | fuse: allow kernel to access "direct_io" files (diff) | |
| download | linux-fc280c9692031ee41545d6bea00bbb7c7dec97a9.tar.xz linux-fc280c9692031ee41545d6bea00bbb7c7dec97a9.zip | |
fuse: allow private mappings of "direct_io" files
Allow MAP_PRIVATE mmaps of "direct_io" files. This is necessary for
execute support.
MAP_SHARED mappings require some sort of coherency between the
underlying file and the mapping. With "direct_io" it is difficult to
provide this, so for the moment just disallow shared (read-write and
read-only) mappings altogether.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/file.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 78a2c8333700..2b25133524a3 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1292,6 +1292,15 @@ static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) return 0; } +static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) +{ + /* Can't provide the coherency needed for MAP_SHARED */ + if (vma->vm_flags & VM_MAYSHARE) + return -ENODEV; + + return generic_file_mmap(file, vma); +} + static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, struct file_lock *fl) { @@ -1926,6 +1935,7 @@ static const struct file_operations fuse_direct_io_file_operations = { .llseek = fuse_file_llseek, .read = fuse_direct_read, .write = fuse_direct_write, + .mmap = fuse_direct_mmap, .open = fuse_open, .flush = fuse_flush, .release = fuse_release, @@ -1935,7 +1945,7 @@ static const struct file_operations fuse_direct_io_file_operations = { .unlocked_ioctl = fuse_file_ioctl, .compat_ioctl = fuse_file_compat_ioctl, .poll = fuse_file_poll, - /* no mmap and splice_read */ + /* no splice_read */ }; static const struct address_space_operations fuse_file_aops = { |