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authornpiggin@suse.de <npiggin@suse.de>2009-04-26 20:25:56 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-11 21:36:02 -0400
commit864d7c4c068f23642efe91b33be3a84afe5f71e0 (patch)
tree512b253428958e95ca99274a664ace103f6bb10e /fs/file_table.c
parent96029c4e09ccbd73a6d0ed2b29e80bf2586ad7ef (diff)
fs: move mark_files_ro into file_table.c
This function walks the s_files lock, and operates primarily on the files in a superblock, so it better belongs here (eg. see also fs_may_remount_ro). [AV: ... and it shouldn't be static after that move] Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/file_table.c')
-rw-r--r--fs/file_table.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index 3d66dbcebef..334ce39881f 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -399,6 +399,44 @@ too_bad:
return 0;
}
+/**
+ * mark_files_ro - mark all files read-only
+ * @sb: superblock in question
+ *
+ * All files are marked read-only. We don't care about pending
+ * delete files so this should be used in 'force' mode only.
+ */
+void mark_files_ro(struct super_block *sb)
+{
+ struct file *f;
+
+retry:
+ file_list_lock();
+ list_for_each_entry(f, &sb->s_files, f_u.fu_list) {
+ struct vfsmount *mnt;
+ if (!S_ISREG(f->f_path.dentry->d_inode->i_mode))
+ continue;
+ if (!file_count(f))
+ continue;
+ if (!(f->f_mode & FMODE_WRITE))
+ continue;
+ f->f_mode &= ~FMODE_WRITE;
+ if (file_check_writeable(f) != 0)
+ continue;
+ file_release_write(f);
+ mnt = mntget(f->f_path.mnt);
+ file_list_unlock();
+ /*
+ * This can sleep, so we can't hold
+ * the file_list_lock() spinlock.
+ */
+ mnt_drop_write(mnt);
+ mntput(mnt);
+ goto retry;
+ }
+ file_list_unlock();
+}
+
void __init files_init(unsigned long mempages)
{
int n;