linux/fs/exfat/iomap.c
Linus Torvalds 728785f8fb This contains a set of nine exfat fixes covering shared writable mappings,
entry error handling, allocation cleanup, FITRIM bounds, and locking:
 
  - Fix valid_size extension over shared writable mappings by lazily
    zeroing page-cache gaps and ensuring racing stores cannot be
    overwritten or extend beyond valid_size.
  - Clean up partially written directory entries on add-entry failure and
    safely free new directory clusters.
  - Free a newly allocated directory cluster when zeroing it fails.
  - Write the destination entry before removing the source entry during
    rename, preserving the source if the destination write fails.
  - Keep FITRIM within the requested range, even when the free-space search
    wraps around the allocation bitmap.
  - Fix truncated FS_IOC_GETFSLABEL results by passing the destination
    buffer size in bytes to the UTF-16-to-NLS conversion.
  - Fix overflow in the cluster-to-dentry calculation, which could cause
    readdir to stop early on large volumes.
  - Replace the per-inode truncate_lock with inode_lock, using shared
    locking in bmap to serialize against concurrent truncation.
  - Update the exfat mailing list address in MAINTAINERS.
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Merge tag 'exfat-for-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

Pull exfat updates from Namjae Jeon:
 "A set of exfat fixes covering shared writable mappings, entry error
  handling, allocation cleanup, FITRIM bounds, and locking:

   - Fix valid_size extension over shared writable mappings by lazily
     zeroing page-cache gaps and ensuring racing stores cannot be
     overwritten or extend beyond valid_size

   - Clean up partially written directory entries on add-entry failure
     and safely free new directory clusters

   - Free a newly allocated directory cluster when zeroing it fails

   - Write the destination entry before removing the source entry during
     rename, preserving the source if the destination write fails

   - Keep FITRIM within the requested range, even when the free-space
     search wraps around the allocation bitmap

   - Fix truncated FS_IOC_GETFSLABEL results by passing the destination
     buffer size in bytes to the UTF-16-to-NLS conversion

   - Fix overflow in the cluster-to-dentry calculation, which could
     cause readdir to stop early on large volumes

   - Replace the per-inode truncate_lock with inode_lock, using shared
     locking in bmap to serialize against concurrent truncation

   - Update the exfat mailing list address in MAINTAINERS"

* tag 'exfat-for-7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: replace truncate_lock with inode_lock
  exfat: keep FITRIM within the requested range
  exfat: fix truncated volume labels returned by FS_IOC_GETFSLABEL
  exfat: fix overflow in cluster-to-dentry conversion
  exfat: clean up new entry on add entry failure
  exfat: free new directory cluster if zeroing fails
  exfat: write moved entry before removing source
  MAINTAINERS: update mailing list address for exfat
  exfat: fix valid_size extension over a shared writable mapping
2026-08-22 08:57:28 -07:00

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