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| author | Michael Halcrow <mhalcrow@us.ibm.com> | 2007-02-12 09:53:48 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 18:48:37 +0100 |
| commit | 70456600f42f85cfcbdd9d7a6029c03b6f9c5d1e (patch) | |
| tree | 1b47957d59bfe3b4e5e5244106678f5542f8f295 /fs/ecryptfs/crypto.c | |
| parent | [PATCH] eCryptfs: Encrypted passthrough (diff) | |
| download | linux-70456600f42f85cfcbdd9d7a6029c03b6f9c5d1e.tar.xz linux-70456600f42f85cfcbdd9d7a6029c03b6f9c5d1e.zip | |
[PATCH] eCryptfs: convert f_op->write() to vfs_write()
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.
ecryptfs should be calling vfs_write(). That way we 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 <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ecryptfs/crypto.c')
| -rw-r--r-- | fs/ecryptfs/crypto.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 44c2ec2e9e6a..2d7db61b9d6c 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -1344,24 +1344,41 @@ static int ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt 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; } static int ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry, |