erofs: support SEEK_HOLE/SEEK_DATA in inode_share mode

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When inode_share is enabled, erofs_ishare_fops.llseek falls back to
generic_file_llseek, which treats the whole file as data and always
returns i_size for SEEK_HOLE, hiding real holes in sparse files.

Switch it to erofs_file_llseek instead.  For user files f_mapping->host
is always the real erofs inode, so SEEK_HOLE/SEEK_DATA resolve the
per-file on-disk layout via iomap_seek_hole()/iomap_seek_data().

Reviewed-by: Gao Xiang <xiang@kernel.org>
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <xiang@kernel.org>

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Jingbo Xu 2026-08-20 21:40:06 +08:00 • committed by Gao Xiang

parent ab74edaeb1

commit 8ebf958978

3 changed files with 3 additions and 2 deletions

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2

fs/erofs/data.c

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1

fs/erofs/internal.h

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2

fs/erofs/ishare.c

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