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f2fs: support dynamic reserve/release for device aliasing

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This patch adds a dynamic management feature to the existing device
aliasing functionality. It allows users to dynamically reserve or
release specific devices from the filesystem's free pool at runtime
through new ioctls.

To support this, three new ioctls are introduced:
- F2FS_IOC_RESERVE_DEV_ALIAS: This reclaims the space occupied by a
  device aliasing file. It first performs a capacity check, resets GC
  victim information for the target range, marks the segments as in-use
  to prevent new allocations, and then triggers GC to migrate existing
  valid data out of the range. Finally, it reserves these blocks in the
  SIT to effectively exclude the device from the usable capacity.

- F2FS_IOC_RELEASE_DEV_ALIAS: This releases the reserved space of a
  previously reserved device aliasing file. It truncates the blocks
  associated with the file, which makes them available for general
  filesystem allocation again.

- F2FS_IOC_GET_DEV_ALIAS_STATUS: This retrieves the current aliasing
  status of a device aliasing file, returning whether the file is
  released (inactive alias) or reserved (active alias, with blocks
  fully allocated on the device).

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong 2026-08-05 18:48:13 -07:00 • committed by Jaegeuk Kim
commit eae3faf210
11 changed files with 557 additions and 68 deletions
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