freeze_super man page on Oracle

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FREEZE_SUPER(9)			 The Linux VFS		       FREEZE_SUPER(9)

NAME
       freeze_super - lock the filesystem and force it into a consistent state

SYNOPSIS
       int freeze_super(struct super_block * sb);

ARGUMENTS
       sb
	   the super to lock

DESCRIPTION
       Syncs the super to make sure the filesystem is consistent and calls the
       fs's freeze_fs. Subsequent calls to this without first thawing the fs
       will return -EBUSY.

       During this function, sb->s_writers.frozen goes through these values:

SB_UNFROZEN
       File system is normal, all writes progress as usual.

SB_FREEZE_WRITE
       The file system is in the process of being frozen. New writes should be
       blocked, though page faults are still allowed. We wait for all writes
       to complete and then proceed to the next stage.

SB_FREEZE_PAGEFAULT
       Freezing continues. Now also page faults are blocked but internal fs
       threads can still modify the filesystem (although they should not dirty
       new pages or inodes), writeback can run etc. After waiting for all
       running page faults we sync the filesystem which will clean all dirty
       pages and inodes (no new dirty pages or inodes can be created when sync
       is running).

SB_FREEZE_FS
       The file system is frozen. Now all internal sources of fs modification
       are blocked (e.g. XFS preallocation truncation on inode reclaim). This
       is usually implemented by blocking new transactions for filesystems
       that have them and need this additional guard. After all internal
       writers are finished we call ->freeze_fs to finish filesystem freezing.
       Then we transition to SB_FREEZE_COMPLETE state. This state is mostly
       auxiliary for filesystems to verify they do not modify frozen fs.

       sb->s_writers.frozen is protected by sb->s_umount.

COPYRIGHT
Kernel Hackers Manual 3.8.	   June 2014		       FREEZE_SUPER(9)
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