fs_bdev_thaw(9)

💅 fs_bdev_thaw(9) 💅

hey bestie!! welcome to the fs_bdev_thaw(9) page from the Kernel API Manual ✨ this one is short and sweet, and it's giving “thaw the block-device superblocks” energy.

🌸 NAME 🌸

• fs_bdev_thaw — thaw every superblock using a block device 💖

✨ SYNOPSIS ✨

int fs_bdev_thaw (struct block_device *bdev );

🎀 ARGUMENTS 🎀

• bdev — block device 🧚

🦋 DESCRIPTION 🦋

okay so fs_bdev_thaw is the counterpart to fs_bdev_freeze 🫶 its whole vibe is: thaw each live superblock using bdev.

A zero return does not imply a superblock is fully unfrozen — it may have been frozen more than once (by the kernel or via another device). no cap, that's the important caveat 😭

💖 RETURN 💖

0, or the first error on a single-fs device; a shared device swallows per-superblock errors, as fs_bdev_freeze does. 👑

👑 SEE ALSO 👑

Kernel file: ./fs/super.c 🦋 peep the whole squad:

• super_lock(9)
• alloc_super(9)
• deactivate_locked_super(9)
• deactivate_super(9)
• grab_super(9)
• retire_super(9)
• generic_shutdown_super(9)
• sget_fc(9)
• iterate_supers_type(9)
• reconfigure_super(9)
• emergency_thaw_all(9)
• get_anon_bdev(9)
• sget_dev(9)
• fs_bdev_freeze(9)
• fs_bdev_file_open_by_dev(9)
• fs_bdev_file_open_by_path(9)
• fs_bdev_unregister(9)
• fs_bdev_file_release(9)
• get_tree_bdev_flags(9)
• get_tree_bdev(9)
• vfs_get_tree(9)
• sb_wait_write(9)
• freeze_super(9)
• thaw_super(9)

mwah 💋 — this one's from ./fs, dated October 2026; periodt. 🫶🌈