From 8ebf9589788575f8868c236d077dbe612395e084 Mon Sep 17 00:00:00 2001 From: Jingbo Xu Date: Thu, 20 Aug 2026 21:40:06 +0800 Subject: [PATCH] erofs: support SEEK_HOLE/SEEK_DATA in inode_share mode 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 Signed-off-by: Jingbo Xu Reviewed-by: Chao Yu Signed-off-by: Gao Xiang --- fs/erofs/data.c | 2 +- fs/erofs/internal.h | 1 + fs/erofs/ishare.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/erofs/data.c b/fs/erofs/data.c index 9aa48c8d67d1..7b58f49b23a0 100644 --- a/fs/erofs/data.c +++ b/fs/erofs/data.c @@ -507,7 +507,7 @@ static int erofs_file_mmap_prepare(struct vm_area_desc *desc) #define erofs_file_mmap_prepare generic_file_readonly_mmap_prepare #endif -static loff_t erofs_file_llseek(struct file *file, loff_t offset, int whence) +loff_t erofs_file_llseek(struct file *file, loff_t offset, int whence) { struct inode *inode = file->f_mapping->host; const struct iomap_ops *ops = &erofs_iomap_ops; diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 57bd21859c65..0cd434d939ba 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -411,6 +411,7 @@ void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len); +loff_t erofs_file_llseek(struct file *file, loff_t offset, int whence); int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map); void erofs_onlinefolio_init(struct folio *folio); void erofs_onlinefolio_split(struct folio *folio); diff --git a/fs/erofs/ishare.c b/fs/erofs/ishare.c index fa7d4112dec5..4c7be60565cb 100644 --- a/fs/erofs/ishare.c +++ b/fs/erofs/ishare.c @@ -156,7 +156,7 @@ static int erofs_ishare_fadvise(struct file *file, loff_t offset, const struct file_operations erofs_ishare_fops = { .open = erofs_ishare_file_open, - .llseek = generic_file_llseek, + .llseek = erofs_file_llseek, .read_iter = erofs_ishare_file_read_iter, .mmap = erofs_ishare_mmap, .release = erofs_ishare_file_release,