Andrew Morton wrote:
> On Tue, 9 Jan 2007 16:22:55 -0600
> Michael Halcrow <[EMAIL PROTECTED]> wrote:
>
> > + lower_file->f_op->write(lower_file, (char __user *)page_virt,
> > + PAGE_CACHE_SIZE, &lower_file->f_pos);
>
> hm. sys_write() takes a local copy of f_pos and writes that back
> into the struct file.It does this so that two concurrent write()
> callers don't make a mess of f_pos, and of the file contents.
>
> Perhaps ecryptfs should be calling vfs_write()?
>
> That way we'd also get the fsnotify notifications, which ecryptfs
> presently appears to have subverted.
Convert direct calls to f_op->write() into calls to vfs_write().
Signed-off-by: Michael Halcrow <[EMAIL PROTECTED]>
---
fs/ecryptfs/crypto.c | 27 ++++++++++++++++++++++-----
fs/ecryptfs/inode.c | 2 +-
2 files changed, 23 insertions(+), 6 deletions(-)
b91d05b02335e38e18ffb87de6127b80bfe66dd7
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 8fbc38c..fbb62c8 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1346,24 +1346,41 @@ int ecryptfs_write_metadata_to_contents(
mm_segment_t oldfs;
int current_header_page;
int header_pages;
+ ssize_t size;
+ int rc = 0;
lower_file->f_pos = 0;
oldfs = get_fs();
set_fs(get_ds());
- lower_file->f_op->write(lower_file, (char __user *)page_virt,
- PAGE_CACHE_SIZE, &lower_file->f_pos);
+ size = vfs_write(lower_file, (char __user *)page_virt, PAGE_CACHE_SIZE,
+ &lower_file->f_pos);
+ if (size < 0) {
+ rc = (int)size;
+ printk(KERN_ERR "Error attempting to write lower page; "
+ "rc = [%d]\n", rc);
+ set_fs(oldfs);
+ goto out;
+ }
header_pages = ((crypt_stat->header_extent_size
* crypt_stat->num_header_extents_at_front)
/ PAGE_CACHE_SIZE);
memset(page_virt, 0, PAGE_CACHE_SIZE);
current_header_page = 1;
while (current_header_page < header_pages) {
- lower_file->f_op->write(lower_file, (char __user *)page_virt,
- PAGE_CACHE_SIZE, &lower_file->f_pos);
+ size = vfs_write(lower_file, (char __user *)page_virt,
+ PAGE_CACHE_SIZE, &lower_file->f_pos);
+ if (size < 0) {
+ rc = (int)size;
+ printk(KERN_ERR "Error attempting to write lower page; "
+ "rc = [%d]\n", rc);
+ set_fs(oldfs);
+ goto out;
+ }
current_header_page++;
}
set_fs(oldfs);
- return 0;
+out:
+ return rc;
}
int ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index bbc1b4f..7d33917 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -201,7 +201,7 @@ static int ecryptfs_initialize_file(stru
lower_dentry->d_name.name);
inode = ecryptfs_dentry->d_inode;
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
- lower_flags = ((O_CREAT | O_WRONLY | O_TRUNC) & O_ACCMODE) | O_RDWR;
+ lower_flags = ((O_CREAT | O_TRUNC) & O_ACCMODE) | O_RDWR;
#if BITS_PER_LONG != 32
lower_flags |= O_LARGEFILE;
#endif
--
1.3.3
-
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