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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>
This commit is contained in:
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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@ -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;

1
fs/erofs/internal.h
View File

@ -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);

2
fs/erofs/ishare.c
View File

@ -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,