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Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse source 
Pull mount flag updates from Al Viro:
 "Another chunk of fmount preparations from dhowells; only trivial
  conflicts for that part. It separates MS_... bits (very grotty
  mount(2) ABI) from the struct super_block ->s_flags (kernel-internal,
  only a small subset of MS_... stuff).

  This does *not* convert the filesystems to new constants; only the
  infrastructure is done here. The next step in that series is where the
  conflicts would be; that's the conversion of filesystems. It's purely
  mechanical and it's better done after the merge, so if you could run
  something like

	list=$(for i in MS_RDONLY MS_NOSUID MS_NODEV MS_NOEXEC MS_SYNCHRONOUS MS_MANDLOCK MS_DIRSYNC MS_NOATIME MS_NODIRATIME MS_SILENT MS_POSIXACL MS_KERNMOUNT MS_I_VERSION MS_LAZYTIME; do git grep -l $i fs drivers/staging/lustre drivers/mtd ipc mm include/linux; done|sort|uniq|grep -v '^fs/namespace.c$')

	sed -i -e 's/\<MS_RDONLY\>/SB_RDONLY/g' \
	        -e 's/\<MS_NOSUID\>/SB_NOSUID/g' \
	        -e 's/\<MS_NODEV\>/SB_NODEV/g' \
	        -e 's/\<MS_NOEXEC\>/SB_NOEXEC/g' \
	        -e 's/\<MS_SYNCHRONOUS\>/SB_SYNCHRONOUS/g' \
	        -e 's/\<MS_MANDLOCK\>/SB_MANDLOCK/g' \
	        -e 's/\<MS_DIRSYNC\>/SB_DIRSYNC/g' \
	        -e 's/\<MS_NOATIME\>/SB_NOATIME/g' \
	        -e 's/\<MS_NODIRATIME\>/SB_NODIRATIME/g' \
	        -e 's/\<MS_SILENT\>/SB_SILENT/g' \
	        -e 's/\<MS_POSIXACL\>/SB_POSIXACL/g' \
	        -e 's/\<MS_KERNMOUNT\>/SB_KERNMOUNT/g' \
	        -e 's/\<MS_I_VERSION\>/SB_I_VERSION/g' \
	        -e 's/\<MS_LAZYTIME\>/SB_LAZYTIME/g' \
	        $list

  and commit it with something along the lines of 'convert filesystems
  away from use of MS_... constants' as commit message, it would save a
  quite a bit of headache next cycle"

* 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  VFS: Differentiate mount flags (MS_*) from internal superblock flags
  VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
  vfs: Add sb_rdonly(sb) to query the MS_RDONLY flag on s_flags
This commit is contained in:
Linus Torvalds 2017-09-14 18:54:01 -07:00
commit 0f0d12728e
76 changed files with 314 additions and 296 deletions
Download patch file Download diff file Expand all files Collapse all files

74
fs/super.c
View file

@ -360,7 +360,7 @@ static int grab_super(struct super_block *s) __releases(sb_lock)
s->s_count++;
spin_unlock(&sb_lock);
down_write(&s->s_umount);
if ((s->s_flags & MS_BORN) && atomic_inc_not_zero(&s->s_active)) {
if ((s->s_flags & SB_BORN) && atomic_inc_not_zero(&s->s_active)) {
put_super(s);
return 1;
}
@ -390,7 +390,7 @@ bool trylock_super(struct super_block *sb)
{
if (down_read_trylock(&sb->s_umount)) {
if (!hlist_unhashed(&sb->s_instances) &&
sb->s_root && (sb->s_flags & MS_BORN))
sb->s_root && (sb->s_flags & SB_BORN))
return true;
up_read(&sb->s_umount);
}
@ -419,7 +419,7 @@ void generic_shutdown_super(struct super_block *sb)
if (sb->s_root) {
shrink_dcache_for_umount(sb);
sync_filesystem(sb);
sb->s_flags &= ~MS_ACTIVE;
sb->s_flags &= ~SB_ACTIVE;
fsnotify_unmount_inodes(sb);
cgroup_writeback_umount();
@ -472,7 +472,7 @@ struct super_block *sget_userns(struct file_system_type *type,
struct super_block *old;
int err;
if (!(flags & (MS_KERNMOUNT|MS_SUBMOUNT)) &&
if (!(flags & (SB_KERNMOUNT|SB_SUBMOUNT)) &&
!(type->fs_flags & FS_USERNS_MOUNT) &&
!capable(CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
@ -502,7 +502,7 @@ retry:
}
if (!s) {
spin_unlock(&sb_lock);
s = alloc_super(type, (flags & ~MS_SUBMOUNT), user_ns);
s = alloc_super(type, (flags & ~SB_SUBMOUNT), user_ns);
if (!s)
return ERR_PTR(-ENOMEM);
goto retry;
@ -547,11 +547,11 @@ struct super_block *sget(struct file_system_type *type,
* mount through to here so always use &init_user_ns
* until that changes.
*/
if (flags & MS_SUBMOUNT)
if (flags & SB_SUBMOUNT)
user_ns = &init_user_ns;
/* Ensure the requestor has permissions over the target filesystem */
if (!(flags & (MS_KERNMOUNT|MS_SUBMOUNT)) && !ns_capable(user_ns, CAP_SYS_ADMIN))
if (!(flags & (SB_KERNMOUNT|SB_SUBMOUNT)) && !ns_capable(user_ns, CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
return sget_userns(type, test, set, flags, user_ns, data);
@ -594,7 +594,7 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
if (sb->s_root && (sb->s_flags & MS_BORN))
if (sb->s_root && (sb->s_flags & SB_BORN))
f(sb, arg);
up_read(&sb->s_umount);
@ -628,7 +628,7 @@ void iterate_supers_type(struct file_system_type *type,
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
if (sb->s_root && (sb->s_flags & MS_BORN))
if (sb->s_root && (sb->s_flags & SB_BORN))
f(sb, arg);
up_read(&sb->s_umount);
@ -664,7 +664,7 @@ rescan:
else
down_write(&sb->s_umount);
/* still alive? */
if (sb->s_root && (sb->s_flags & MS_BORN))
if (sb->s_root && (sb->s_flags & SB_BORN))
return sb;
if (!excl)
up_read(&sb->s_umount);
@ -785,7 +785,7 @@ rescan:
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
/* still alive? */
if (sb->s_root && (sb->s_flags & MS_BORN))
if (sb->s_root && (sb->s_flags & SB_BORN))
return sb;
up_read(&sb->s_umount);
/* nope, got unmounted */
@ -801,13 +801,13 @@ rescan:
/**
* do_remount_sb - asks filesystem to change mount options.
* @sb: superblock in question
* @flags: numeric part of options
* @sb_flags: revised superblock flags
* @data: the rest of options
* @force: whether or not to force the change
*
* Alters the mount options of a mounted file system.
*/
int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
int do_remount_sb(struct super_block *sb, int sb_flags, void *data, int force)
{
int retval;
int remount_ro;
@ -816,11 +816,11 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
return -EBUSY;
#ifdef CONFIG_BLOCK
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
if (!(sb_flags & SB_RDONLY) && bdev_read_only(sb->s_bdev))
return -EACCES;
#endif
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
remount_ro = (sb_flags & SB_RDONLY) && !sb_rdonly(sb);
if (remount_ro) {
if (!hlist_empty(&sb->s_pins)) {
@ -831,7 +831,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
return 0;
if (sb->s_writers.frozen != SB_UNFROZEN)
return -EBUSY;
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
remount_ro = (sb_flags & SB_RDONLY) && !sb_rdonly(sb);
}
}
shrink_dcache_sb(sb);
@ -850,7 +850,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
}
if (sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
retval = sb->s_op->remount_fs(sb, &sb_flags, data);
if (retval) {
if (!force)
goto cancel_readonly;
@ -859,7 +859,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
sb->s_type->name, retval);
}
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (sb_flags & MS_RMT_MASK);
/* Needs to be ordered wrt mnt_is_readonly() */
smp_wmb();
sb->s_readonly_remount = 0;
@ -892,12 +892,12 @@ static void do_emergency_remount(struct work_struct *work)
sb->s_count++;
spin_unlock(&sb_lock);
down_write(&sb->s_umount);
if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) &&
!(sb->s_flags & MS_RDONLY)) {
if (sb->s_root && sb->s_bdev && (sb->s_flags & SB_BORN) &&
!sb_rdonly(sb)) {
/*
* What lock protects sb->s_flags??
*/
do_remount_sb(sb, MS_RDONLY, NULL, 1);
do_remount_sb(sb, SB_RDONLY, NULL, 1);
}
up_write(&sb->s_umount);
spin_lock(&sb_lock);
@ -1023,7 +1023,7 @@ struct dentry *mount_ns(struct file_system_type *fs_type,
/* Don't allow mounting unless the caller has CAP_SYS_ADMIN
* over the namespace.
*/
if (!(flags & MS_KERNMOUNT) && !ns_capable(user_ns, CAP_SYS_ADMIN))
if (!(flags & SB_KERNMOUNT) && !ns_capable(user_ns, CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
sb = sget_userns(fs_type, ns_test_super, ns_set_super, flags,
@ -1033,13 +1033,13 @@ struct dentry *mount_ns(struct file_system_type *fs_type,
if (!sb->s_root) {
int err;
err = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
err = fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
if (err) {
deactivate_locked_super(sb);
return ERR_PTR(err);
}
sb->s_flags |= MS_ACTIVE;
sb->s_flags |= SB_ACTIVE;
}
return dget(sb->s_root);
@ -1071,7 +1071,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
fmode_t mode = FMODE_READ | FMODE_EXCL;
int error = 0;
if (!(flags & MS_RDONLY))
if (!(flags & SB_RDONLY))
mode |= FMODE_WRITE;
bdev = blkdev_get_by_path(dev_name, mode, fs_type);
@ -1089,14 +1089,14 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
error = -EBUSY;
goto error_bdev;
}
s = sget(fs_type, test_bdev_super, set_bdev_super, flags | MS_NOSEC,
s = sget(fs_type, test_bdev_super, set_bdev_super, flags | SB_NOSEC,
bdev);
mutex_unlock(&bdev->bd_fsfreeze_mutex);
if (IS_ERR(s))
goto error_s;
if (s->s_root) {
if ((flags ^ s->s_flags) & MS_RDONLY) {
if ((flags ^ s->s_flags) & SB_RDONLY) {
deactivate_locked_super(s);
error = -EBUSY;
goto error_bdev;
@ -1116,13 +1116,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
s->s_mode = mode;
snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
sb_set_blocksize(s, block_size(bdev));
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
if (error) {
deactivate_locked_super(s);
goto error;
}
s->s_flags |= MS_ACTIVE;
s->s_flags |= SB_ACTIVE;
bdev->bd_super = s;
}
@ -1162,12 +1162,12 @@ struct dentry *mount_nodev(struct file_system_type *fs_type,
if (IS_ERR(s))
return ERR_CAST(s);
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
if (error) {
deactivate_locked_super(s);
return ERR_PTR(error);
}
s->s_flags |= MS_ACTIVE;
s->s_flags |= SB_ACTIVE;
return dget(s->s_root);
}
EXPORT_SYMBOL(mount_nodev);
@ -1188,12 +1188,12 @@ struct dentry *mount_single(struct file_system_type *fs_type,
if (IS_ERR(s))
return ERR_CAST(s);
if (!s->s_root) {
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
if (error) {
deactivate_locked_super(s);
return ERR_PTR(error);
}
s->s_flags |= MS_ACTIVE;
s->s_flags |= SB_ACTIVE;
} else {
do_remount_sb(s, flags, data, 0);
}
@ -1227,7 +1227,7 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
sb = root->d_sb;
BUG_ON(!sb);
WARN_ON(!sb->s_bdi);
sb->s_flags |= MS_BORN;
sb->s_flags |= SB_BORN;
error = security_sb_kern_mount(sb, flags, secdata);
if (error)
@ -1434,12 +1434,12 @@ int freeze_super(struct super_block *sb)
return -EBUSY;
}
if (!(sb->s_flags & MS_BORN)) {
if (!(sb->s_flags & SB_BORN)) {
up_write(&sb->s_umount);
return 0; /* sic - it's "nothing to do" */
}
if (sb->s_flags & MS_RDONLY) {
if (sb_rdonly(sb)) {
/* Nothing to do really... */
sb->s_writers.frozen = SB_FREEZE_COMPLETE;
up_write(&sb->s_umount);
@ -1502,7 +1502,7 @@ int thaw_super(struct super_block *sb)
return -EINVAL;
}
if (sb->s_flags & MS_RDONLY) {
if (sb_rdonly(sb)) {
sb->s_writers.frozen = SB_UNFROZEN;
goto out;
}