提交 864d7c4c 编写于 作者: N npiggin@suse.de 提交者: Al Viro

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: NNick Piggin <npiggin@suse.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 96029c4e
...@@ -399,6 +399,44 @@ int fs_may_remount_ro(struct super_block *sb) ...@@ -399,6 +399,44 @@ int fs_may_remount_ro(struct super_block *sb)
return 0; 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) void __init files_init(unsigned long mempages)
{ {
int n; int n;
......
...@@ -66,3 +66,8 @@ extern void __init mnt_init(void); ...@@ -66,3 +66,8 @@ extern void __init mnt_init(void);
* fs_struct.c * fs_struct.c
*/ */
extern void chroot_fs_refs(struct path *, struct path *); extern void chroot_fs_refs(struct path *, struct path *);
/*
* file_table.c
*/
extern void mark_files_ro(struct super_block *);
...@@ -615,45 +615,6 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf) ...@@ -615,45 +615,6 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
return err; return err;
} }
/**
* 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.
*/
static 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();
}
/** /**
* do_remount_sb - asks filesystem to change mount options. * do_remount_sb - asks filesystem to change mount options.
* @sb: superblock in question * @sb: superblock in question
......
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