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| author | Mike Marshall <hubcap@omnibond.com> | 2019-11-26 12:39:37 -0500 |
|---|---|---|
| committer | Mike Marshall <hubcap@omnibond.com> | 2019-12-04 08:52:55 -0500 |
| commit | f9bbb68233aa5bd5ef238bd3532fddf92fa1b53c (patch) | |
| tree | 4aeb26c8576aba66f2e479766a4c00806cb3f5f1 /fs/orangefs/inode.c | |
| parent | a99d8080aaf358d5d23581244e5da23b35e340b9 (diff) | |
| download | linux-f9bbb68233aa5bd5ef238bd3532fddf92fa1b53c.tar.gz linux-f9bbb68233aa5bd5ef238bd3532fddf92fa1b53c.tar.bz2 linux-f9bbb68233aa5bd5ef238bd3532fddf92fa1b53c.zip | |
orangefs: posix open permission checking...
Orangefs has no open, and orangefs checks file permissions
on each file access. Posix requires that file permissions
be checked on open and nowhere else. Orangefs-through-the-kernel
needs to seem posix compliant.
The VFS opens files, even if the filesystem provides no
method. We can see if a file was successfully opened for
read and or for write by looking at file->f_mode.
When writes are flowing from the page cache, file is no
longer available. We can trust the VFS to have checked
file->f_mode before writing to the page cache.
The mode of a file might change between when it is opened
and IO commences, or it might be created with an arbitrary mode.
We'll make sure we don't hit EACCES during the IO stage by
using UID 0. Some of the time we have access without changing
to UID 0 - how to check?
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Diffstat (limited to 'fs/orangefs/inode.c')
| -rw-r--r-- | fs/orangefs/inode.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c index efb12197da18..961c0fd8675a 100644 --- a/fs/orangefs/inode.c +++ b/fs/orangefs/inode.c @@ -55,7 +55,7 @@ static int orangefs_writepage_locked(struct page *page, iov_iter_bvec(&iter, WRITE, &bv, 1, wlen); ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen, - len, wr, NULL); + len, wr, NULL, NULL); if (ret < 0) { SetPageError(page); mapping_set_error(page->mapping, ret); @@ -126,7 +126,7 @@ static int orangefs_writepages_work(struct orangefs_writepages *ow, wr.uid = ow->uid; wr.gid = ow->gid; ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len, - 0, &wr, NULL); + 0, &wr, NULL, NULL); if (ret < 0) { for (i = 0; i < ow->npages; i++) { SetPageError(ow->pages[i]); @@ -311,7 +311,7 @@ static int orangefs_readpage(struct file *file, struct page *page) iov_iter_bvec(&iter, READ, &bv, 1, PAGE_SIZE); ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter, - read_size, inode->i_size, NULL, &buffer_index); + read_size, inode->i_size, NULL, &buffer_index, file); remaining = ret; /* this will only zero remaining unread portions of the page data */ iov_iter_zero(~0U, &iter); @@ -651,7 +651,7 @@ static ssize_t orangefs_direct_IO(struct kiocb *iocb, (int)*offset); ret = wait_for_direct_io(type, inode, offset, iter, - each_count, 0, NULL, NULL); + each_count, 0, NULL, NULL, file); gossip_debug(GOSSIP_FILE_DEBUG, "%s(%pU): return from wait_for_io:%d\n", __func__, |