linux/fs/exfat, branch master

Merge tag 'exfat-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat

2026-04-13T23:57:31Z

Pull exfat updates from Namjae Jeon: - Implement FALLOC_FL_ALLOCATE_RANGE to add support for preallocating clusters without zeroing, helping to reduce file fragmentation - Add a unified block readahead helper for FAT chain conversion, bitmap allocation, and directory entry lookups - Optimize exfat_chain_cont_cluster() by caching buffer heads to minimize mark_buffer_dirty() and mirroring overhead during NO_FAT_CHAIN to FAT_CHAIN conversion - Switch to truncate_inode_pages_final() in evict_inode() to prevent BUG_ON caused by shadow entries during reclaim - Fix a 32-bit truncation bug in directory entry calculations by ensuring proper bitwise coercion - Fix sb->s_maxbytes calculation to correctly reflect the maximum possible volume size for a given cluster size, resolving xfstests generic/213 - Introduced exfat_cluster_walk() helper to traverse FAT chains by a specified step, handling both ALLOC_NO_FAT_CHAIN and ALLOC_FAT_CHAIN modes - Introduced exfat_chain_advance() helper to advance an exfat_chain structure, updating both the current cluster and remaining size - Remove dead assignments and fix Smatch warnings * tag 'exfat-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat: exfat: use exfat_chain_advance helper exfat: introduce exfat_chain_advance helper exfat: remove NULL cache pointer case in exfat_ent_get exfat: use exfat_cluster_walk helper exfat: introduce exfat_cluster_walk helper exfat: fix incorrect directory checksum after rename to shorter name exfat: fix s_maxbytes exfat: fix passing zero to ERR_PTR() in exfat_mkdir() exfat: fix error handling for FAT table operations exfat: optimize exfat_chain_cont_cluster with cached buffer heads exfat: drop redundant sec parameter from exfat_mirror_bh exfat: use readahead helper in exfat_get_dentry exfat: use readahead helper in exfat_allocate_bitmap exfat: add block readahead in exfat_chain_cont_cluster exfat: add fallocate FALLOC_FL_ALLOCATE_RANGE support exfat: Fix bitwise operation having different size exfat: Drop dead assignment of num_clusters exfat: use truncate_inode_pages_final() at evict_inode()

exfat: use exfat_chain_advance helper

2026-04-03T13:41:10Z

Replace open-coded cluster chain walking logic with exfat_chain_advance() across exfat_readdir, exfat_find_dir_entry, exfat_count_dir_entries, exfat_search_empty_slot and exfat_check_dir_empty. Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: introduce exfat_chain_advance helper

2026-04-03T13:41:08Z

Introduce exfat_chain_advance() to walk a exfat_chain structure by a given step, updating both ->dir and ->size fields atomically. This helper handles both ALLOC_NO_FAT_CHAIN and ALLOC_FAT_CHAIN modes with proper boundary checking. Suggested-by: Yuezhang Mo Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: remove NULL cache pointer case in exfat_ent_get

2026-04-03T13:41:07Z

Since exfat_get_next_cluster has been updated, no callers pass a NULL pointer to exfat_ent_get, so remove the handling logic for this case. Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: use exfat_cluster_walk helper

2026-04-03T13:41:05Z

Replace the custom exfat_walk_fat_chain() function and open-coded FAT chain walking logic with the exfat_cluster_walk() helper across exfat_find_location, __exfat_get_dentry_set, and exfat_map_cluster. Suggested-by: Sungjong Seo Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: introduce exfat_cluster_walk helper

2026-04-03T13:41:04Z

Introduce exfat_cluster_walk() to walk the FAT chain by a given step, handling both ALLOC_NO_FAT_CHAIN and ALLOC_FAT_CHAIN modes. Also redefine exfat_get_next_cluster as a thin wrapper around it for backward compatibility. Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: fix incorrect directory checksum after rename to shorter name

2026-04-03T13:41:02Z

When renaming a file in-place to a shorter name, exfat_remove_entries marks excess entries as DELETED, but es->num_entries is not updated accordingly. As a result, exfat_update_dir_chksum iterates over the deleted entries and computes an incorrect checksum. This does not lead to persistent corruption because mark_inode_dirty() is called afterward, and __exfat_write_inode later recomputes the checksum using the correct num_entries value. Fix by setting es->num_entries = num_entries in exfat_init_ext_entry. Signed-off-by: Chi Zhiling Reviewed-by: Sungjong Seo Reviewed-by: Yuezhang Mo Signed-off-by: Namjae Jeon

exfat: fix s_maxbytes

2026-03-31T14:01:07Z

With fallocate support, xfstest unit generic/213 fails with QA output created by 213 We should get: fallocate: No space left on device Strangely, xfs_io sometimes says "Success" when something went wrong -fallocate: No space left on device +fallocate: File too large because sb->s_maxbytes is set to the volume size. To be in line with other non-extent-based filesystems, set to max volume size possible with the cluster size of the volume. Signed-off-by: David Timber Signed-off-by: Namjae Jeon

fs: Rename generic_file_fsync() to simple_fsync()

2026-03-26T14:03:28Z

The implementation is now really basic so rename generic_file_fsync() simple_fsync() and __generic_file_fsync() to simple_fsync_noflush(). Signed-off-by: Jan Kara Link: https://patch.msgid.link/20260326095354.16340-56-jack@suse.cz Signed-off-by: Christian Brauner

exfat: Drop pointless invalidate_inode_buffers() call

2026-03-26T14:03:27Z

EXFAT never calls mark_buffer_dirty_inode() and thus invalidate_inode_buffers() never has anything to evict. Drop the pointless call. Signed-off-by: Jan Kara Link: https://patch.msgid.link/20260326095354.16340-49-jack@suse.cz Signed-off-by: Christian Brauner