WRITEBACK_INODES_SB(9) The Linux VFS WRITEBACK_INODES_SB(9)NAME
writeback_inodes_sb - writeback dirty inodes from given super_block
SYNOPSIS
void writeback_inodes_sb(struct super_block * sb);
ARGUMENTS
sb
the superblock
DESCRIPTION
Start writeback on some inodes on this super_block. No guarantees are made on how many (if any) will be written, and this function does not
wait for IO completion of submitted IO. The number of pages submitted is returned.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 WRITEBACK_INODES_SB(9)
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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 3.10 June 2014 FREEZE_SUPER(9)
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