summaryrefslogtreecommitdiff
path: root/fs/open.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c31
1 files changed, 25 insertions, 6 deletions
diff --git a/fs/open.c b/fs/open.c
index a65ce47810cf..fe63e236da22 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -870,6 +870,30 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
return ksys_fchown(fd, user, group);
}
+static inline int file_get_write_access(struct file *f)
+{
+ int error;
+
+ error = get_write_access(f->f_inode);
+ if (unlikely(error))
+ return error;
+ error = mnt_get_write_access(f->f_path.mnt);
+ if (unlikely(error))
+ goto cleanup_inode;
+ if (unlikely(f->f_mode & FMODE_BACKING)) {
+ error = mnt_get_write_access(backing_file_real_path(f)->mnt);
+ if (unlikely(error))
+ goto cleanup_mnt;
+ }
+ return 0;
+
+cleanup_mnt:
+ mnt_put_write_access(f->f_path.mnt);
+cleanup_inode:
+ put_write_access(f->f_inode);
+ return error;
+}
+
static int do_dentry_open(struct file *f,
struct inode *inode,
int (*open)(struct inode *, struct file *))
@@ -892,14 +916,9 @@ static int do_dentry_open(struct file *f,
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
i_readcount_inc(inode);
} else if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
- error = get_write_access(inode);
+ error = file_get_write_access(f);
if (unlikely(error))
goto cleanup_file;
- error = mnt_get_write_access(f->f_path.mnt);
- if (unlikely(error)) {
- put_write_access(inode);
- goto cleanup_file;
- }
f->f_mode |= FMODE_WRITER;
}