kernel/git/next/linux-next.git/fs/erofs, branch fs-current

erofs: hide "cache_strategy=" for plain filesystems

2026-07-13T08:41:42+00:00

"cache_strategy=" is meaningless and confusing on unencoded EROFS filesystems; gate it on compressed images only since it's now possible after commit 7cef3c834194 ("erofs: separate plain and compressed filesystems formally"). Signed-off-by: Gao Xiang

erofs: get rid of erofs_is_ishare_inode() helper

2026-07-08T07:07:47+00:00

Just open-code it for simplicity since FS_ONDEMAND no longer exists. Signed-off-by: Gao Xiang

erofs: relax sanity check for tail pclusters due to ztailpacking

2026-07-08T07:07:41+00:00

If the tail data can be inlined into the inode meta block, it should be converted into a regular tail pcluster. In principle, it should be converted into an uncompressed pcluster if there is not enough gain to use compression (map->m_llen < map->m_plen); but since there are various shipped images, relax the condition for ztailpacking tail pcluster fallback instead of reporting corruption incorrectly. Reported-and-tested-by: Yifan Zhao Reported-by: Alberto Salvia Novella Closes: https://github.com/erofs/erofs-utils/issues/51 Fixes: a5242d37c83a ("erofs: error out obviously illegal extents in advance") Signed-off-by: Gao Xiang

erofs: use more informative s_id for file-backed mounts

2026-06-30T05:42:53+00:00

For file-backed mounts, set sb->s_id to the MAJOR:MINOR of sb->s_dev (which fstat() will return) so that kernel messages and the sysfs name are more informative rather than just "erofs: (device erofs): ...". Reviewed-by: Hongbo Li Signed-off-by: Gao Xiang

erofs: handle 48-bit blocks_hi for compressed inodes

2026-06-22T10:50:36+00:00

Combine i_nb.blocks_hi with i_u.blocks_lo when computing inode->i_blocks for compressed inodes, mirroring the startblk_hi handling for unencoded inodes a few lines above. Also evaluate the shift in u64 to avoid truncation. Fixes: efb2aef569b3 ("erofs: add encoded extent on-disk definition") Fixes: 1d191b4ca51d ("erofs: implement encoded extent metadata") Reviewed-by: Gao Xiang Signed-off-by: Zhan Xusheng Signed-off-by: Gao Xiang

erofs: remove fscache backend entirely

2026-06-22T03:00:06+00:00

EROFS over fscache was introduced to provide image lazy pulling functionality. After the feature landed, the fscache subsystem made netfs a new hard dependency, which is unexpected for a local filesystem and has an kernel-defined caching hierarchy which could be inflexible compared to the fanotify pre-content hooks. Therefore, this feature has been deprecated for almost two years. As EROFS file-backed mounts and fanotify pre-content hooks both upstream for a while and already providing equivalent functionality (erofs-utils has supported fanotify pre-content hooks), let's remove the fscache backend now. The main application of this feature is Nydus [1], and they plan to move to use fanotify pre-content hooks in the near future too. I hope this patch can be merged into Linux 7.2, which is also motivated by newly found implementation issues [2][3] that are not worth investigating given the deprecation and limited development resources. The associated fscache/cachefiles cleanup patch will follow separately through the vfs tree (netfs) later: it seems fine since the codebase is isolated by CONFIG_CACHEFILES_ONDEMAND. [1] https://github.com/dragonflyoss/nydus/blob/v2.1.0/docs/nydus-fscache.md [2] https://github.com/dragonflyoss/nydus/pull/1824 [3] https://lore.kernel.org/r/20260619135800.1594811-1-michael.bommarito@gmail.com Acked-by: Jingbo Xu Signed-off-by: Gao Xiang

erofs: simplify RCU read critical sections

2026-06-21T22:49:14+00:00

- use scoped_guard() for RCU read critical section in z_erofs_decompress_kickoff(); - simplify the RCU critical section loop in z_erofs_pcluster_begin(). Signed-off-by: Gao Xiang

erofs: add sparse support to pcluster layout

2026-06-21T22:48:59+00:00

Although zeros can be compressed transparently on EROFS using fixed-size output compression so that it is never prioritized in the Android use cases, indicating entire pclusters as holes is still useful to preserve holes in the sparse datasets; otherwise overlayfs will allocate more space when copying up, and SEEK_HOLE won't report any hole. This patch introduces two ways to mark a pcluster as a hole: - A new Z_EROFS_LI_HOLE compatible flag (bit 14) in the HEAD lcluster advise field for non-compact (full) indexes; - A 0-block CBLKCNT value on the first NONHEAD lcluster. The hole tag is preferred for maximum compatibility since pre-existing kernels that do not understand Z_EROFS_LI_HOLE will decompress at the stored blkaddr (the same blkaddr will be shared among all sparse pclusters). Only the 0-block CBLKCNT approach also works for compact indexes, but it is limited to big pclusters and new kernels. Signed-off-by: Gao Xiang

erofs: introduce erofs_map_chunks()

2026-06-17T04:01:45+00:00

Try to map more chunks in the same metadata on-disk block for more efficient IO performance. Signed-off-by: Gao Xiang

erofs: call erofs_exit_ishare() before rcu_barrier()

2026-06-17T04:01:34+00:00

Ensure all inode free callbacks have completed before destroying the inode slab cache. Fixes: 5ef3208e3be5 ("erofs: introduce the page cache share feature") Reviewed-by: Hongbo Li Signed-off-by: Gao Xiang