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Diffstat (limited to 'fs/ecryptfs/file.c')
-rw-r--r--fs/ecryptfs/file.c100
1 files changed, 48 insertions, 52 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 2b17f2f9b12..d45ba456812 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -138,29 +138,50 @@ out:
return rc;
}
-static void ecryptfs_vma_close(struct vm_area_struct *vma)
-{
- filemap_write_and_wait(vma->vm_file->f_mapping);
-}
-
-static const struct vm_operations_struct ecryptfs_file_vm_ops = {
- .close = ecryptfs_vma_close,
- .fault = filemap_fault,
-};
+struct kmem_cache *ecryptfs_file_info_cache;
-static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+static int read_or_initialize_metadata(struct dentry *dentry)
{
+ struct inode *inode = dentry->d_inode;
+ struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
+ struct ecryptfs_crypt_stat *crypt_stat;
int rc;
- rc = generic_file_mmap(file, vma);
+ crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
+ mount_crypt_stat = &ecryptfs_superblock_to_private(
+ inode->i_sb)->mount_crypt_stat;
+ mutex_lock(&crypt_stat->cs_mutex);
+
+ if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED &&
+ crypt_stat->flags & ECRYPTFS_KEY_VALID) {
+ rc = 0;
+ goto out;
+ }
+
+ rc = ecryptfs_read_metadata(dentry);
if (!rc)
- vma->vm_ops = &ecryptfs_file_vm_ops;
+ goto out;
+
+ if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) {
+ crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
+ | ECRYPTFS_ENCRYPTED);
+ rc = 0;
+ goto out;
+ }
+
+ if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) &&
+ !i_size_read(ecryptfs_inode_to_lower(inode))) {
+ rc = ecryptfs_initialize_file(dentry, inode);
+ if (!rc)
+ goto out;
+ }
+ rc = -EIO;
+out:
+ mutex_unlock(&crypt_stat->cs_mutex);
return rc;
}
-struct kmem_cache *ecryptfs_file_info_cache;
-
/**
* ecryptfs_open
* @inode: inode speciying file to open
@@ -236,32 +257,9 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
rc = 0;
goto out;
}
- mutex_lock(&crypt_stat->cs_mutex);
- if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
- || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
- rc = ecryptfs_read_metadata(ecryptfs_dentry);
- if (rc) {
- ecryptfs_printk(KERN_DEBUG,
- "Valid headers not found\n");
- if (!(mount_crypt_stat->flags
- & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
- rc = -EIO;
- printk(KERN_WARNING "Either the lower file "
- "is not in a valid eCryptfs format, "
- "or the key could not be retrieved. "
- "Plaintext passthrough mode is not "
- "enabled; returning -EIO\n");
- mutex_unlock(&crypt_stat->cs_mutex);
- goto out_put;
- }
- rc = 0;
- crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
- | ECRYPTFS_ENCRYPTED);
- mutex_unlock(&crypt_stat->cs_mutex);
- goto out;
- }
- }
- mutex_unlock(&crypt_stat->cs_mutex);
+ rc = read_or_initialize_metadata(ecryptfs_dentry);
+ if (rc)
+ goto out_put;
ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = "
"[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino,
(unsigned long long)i_size_read(inode));
@@ -277,8 +275,14 @@ out:
static int ecryptfs_flush(struct file *file, fl_owner_t td)
{
- return file->f_mode & FMODE_WRITE
- ? filemap_write_and_wait(file->f_mapping) : 0;
+ struct file *lower_file = ecryptfs_file_to_lower(file);
+
+ if (lower_file->f_op && lower_file->f_op->flush) {
+ filemap_write_and_wait(file->f_mapping);
+ return lower_file->f_op->flush(lower_file, td);
+ }
+
+ return 0;
}
static int ecryptfs_release(struct inode *inode, struct file *file)
@@ -292,15 +296,7 @@ static int ecryptfs_release(struct inode *inode, struct file *file)
static int
ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
- int rc = 0;
-
- rc = generic_file_fsync(file, start, end, datasync);
- if (rc)
- goto out;
- rc = vfs_fsync_range(ecryptfs_file_to_lower(file), start, end,
- datasync);
-out:
- return rc;
+ return vfs_fsync(ecryptfs_file_to_lower(file), datasync);
}
static int ecryptfs_fasync(int fd, struct file *file, int flag)
@@ -369,7 +365,7 @@ const struct file_operations ecryptfs_main_fops = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ecryptfs_compat_ioctl,
#endif
- .mmap = ecryptfs_file_mmap,
+ .mmap = generic_file_mmap,
.open = ecryptfs_open,
.flush = ecryptfs_flush,
.release = ecryptfs_release,