[PATCH v2 8/8] fs: erofs: add unaligned read range handling
Qu Wenruo
wqu at suse.com
Tue Jul 26 07:22:16 CEST 2022
I'm not an expert on erofs, but my quick glance didn't expose any
special handling on unaligned range, thus I think the U-boot erofs
driver doesn't really support unaligned read range.
This patch will add erofs_get_blocksize() so erofs can benefit from the
generic unaligned read support.
Cc: Huang Jianan <jnhuang95 at gmail.com>
Cc: linux-erofs at lists.ozlabs.org
Signed-off-by: Qu Wenruo <wqu at suse.com>
Reviewed-by: Huang Jianan <jnhuang95 at gmail.com>
---
fs/erofs/internal.h | 1 +
fs/erofs/super.c | 6 ++++++
fs/fs.c | 2 +-
include/erofs.h | 1 +
4 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 4af7c91560cc..d368a6481bf1 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -83,6 +83,7 @@ struct erofs_sb_info {
u16 available_compr_algs;
u16 lz4_max_distance;
u32 checksum;
+ u32 blocksize;
u16 extra_devices;
union {
u16 devt_slotoff; /* used for mkfs */
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 4cca322b9ead..df01d2e719a7 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -99,7 +99,13 @@ int erofs_read_superblock(void)
sbi.build_time = le64_to_cpu(dsb->build_time);
sbi.build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
+ sbi.blocksize = 1 << blkszbits;
memcpy(&sbi.uuid, dsb->uuid, sizeof(dsb->uuid));
return erofs_init_devices(&sbi, dsb);
}
+
+int erofs_get_blocksize(const char *filename)
+{
+ return sbi.blocksize;
+}
diff --git a/fs/fs.c b/fs/fs.c
index 2b847d83597b..23cfb1f5025b 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -375,7 +375,7 @@ static struct fstype_info fstypes[] = {
.readdir = erofs_readdir,
.ls = fs_ls_generic,
.read = erofs_read,
- .get_blocksize = fs_get_blocksize_unsupported,
+ .get_blocksize = erofs_get_blocksize,
.size = erofs_size,
.close = erofs_close,
.closedir = erofs_closedir,
diff --git a/include/erofs.h b/include/erofs.h
index 1fbe82bf72cb..18bd6807c538 100644
--- a/include/erofs.h
+++ b/include/erofs.h
@@ -10,6 +10,7 @@ int erofs_probe(struct blk_desc *fs_dev_desc,
struct disk_partition *fs_partition);
int erofs_read(const char *filename, void *buf, loff_t offset,
loff_t len, loff_t *actread);
+int erofs_get_blocksize(const char *filename);
int erofs_size(const char *filename, loff_t *size);
int erofs_exists(const char *filename);
void erofs_close(void);
--
2.37.0
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