SB_START_WRITE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux VFS

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NAMEsb_start_write − get write access to a superblock

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SYNOPSISvoid sb_start_write(struct super_block * sb);

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ARGUMENTSsb the super we write to

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DESCRIPTIONWhen a process wants to write data or metadata to a file system (i​.e​. dirty a page or an inode), it should embed the operation in a sb_start_write − sb_end_write pair to get exclusion against file system freezing​. This function increments number of writers preventing freezing​. If the file system is already frozen, the function waits until the file system is thawed​. Since freeze protection behaves as a lock, users have to preserve ordering of freeze protection and other filesystem locks​. Generally, freeze protection should be the outermost lock​. In particular, we have: sb_start_write −> i_mutex (write path, truncate, directory ops, ​.​.​.) −> s_umount (freeze_super, thaw_super)

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