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eCryptfs: Call lower ->flush() from ecryptfs_flush() 

Since eCryptfs only calls fput() on the lower file in
ecryptfs_release(), eCryptfs should call the lower filesystem's
->flush() from ecryptfs_flush().

If the lower filesystem implements ->flush(), then eCryptfs should try
to flush out any dirty pages prior to calling the lower ->flush(). If
the lower filesystem does not implement ->flush(), then eCryptfs has no
need to do anything in ecryptfs_flush() since dirty pages are now
written out to the lower filesystem in ecryptfs_release().

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
This commit is contained in:
Tyler Hicks 2012-09-12 18:38:00 -07:00
parent 7149f2558d
commit 64e6651dcc
1 changed files with 8 additions and 2 deletions
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10
fs/ecryptfs/file.c
View File

@ -275,8 +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)