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-rw-r--r--Documentation/filesystems/erofs.rst4
-rw-r--r--fs/erofs/erofs_fs.h5
-rw-r--r--fs/erofs/inode.c3
-rw-r--r--fs/erofs/internal.h10
-rw-r--r--fs/erofs/super.c45
5 files changed, 37 insertions, 30 deletions
diff --git a/Documentation/filesystems/erofs.rst b/Documentation/filesystems/erofs.rst
index a43aacf1494e..4654ee57c1d5 100644
--- a/Documentation/filesystems/erofs.rst
+++ b/Documentation/filesystems/erofs.rst
@@ -40,8 +40,8 @@ Here are the main features of EROFS:
- Support multiple devices to refer to external blobs, which can be used
for container images;
- - 4KiB block size and 32-bit block addresses for each device, therefore
- 16TiB address space at most for now;
+ - 32-bit block addresses for each device, therefore 16TiB address space at
+ most with 4KiB block size for now;
- Two inode layouts for different requirements:
diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index dbcd24371002..44876a97cabd 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -53,7 +53,7 @@ struct erofs_super_block {
__le32 magic; /* file system magic number */
__le32 checksum; /* crc32c(super_block) */
__le32 feature_compat;
- __u8 blkszbits; /* support block_size == PAGE_SIZE only */
+ __u8 blkszbits; /* filesystem block size in bit shift */
__u8 sb_extslots; /* superblock size = 128 + sb_extslots * 16 */
__le16 root_nid; /* nid of root directory */
@@ -75,7 +75,8 @@ struct erofs_super_block {
} __packed u1;
__le16 extra_devices; /* # of devices besides the primary device */
__le16 devt_slotoff; /* startoff = devt_slotoff * devt_slotsize */
- __u8 reserved[6];
+ __u8 dirblkbits; /* directory block size in bit shift */
+ __u8 reserved[5];
__le64 packed_nid; /* nid of the special packed inode */
__u8 reserved2[24];
};
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 3502daee8d3b..7ca9aafb7471 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -291,7 +291,8 @@ static int erofs_fill_inode(struct inode *inode)
}
if (erofs_inode_is_data_compressed(vi->datalayout)) {
- if (!erofs_is_fscache_mode(inode->i_sb))
+ if (!erofs_is_fscache_mode(inode->i_sb) &&
+ inode->i_sb->s_blocksize_bits == PAGE_SHIFT)
err = z_erofs_fill_inode(inode);
else
err = -EOPNOTSUPP;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 66ff0513866f..9eff0c0ad2d7 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -148,7 +148,7 @@ struct erofs_sb_info {
u16 device_id_mask; /* valid bits of device id to be used */
unsigned char islotbits; /* inode slot unit size in bit shift */
- unsigned char blkszbits;
+ unsigned char blkszbits; /* filesystem block size in bit shift */
u32 sb_size; /* total superblock size */
u32 build_time_nsec;
@@ -240,14 +240,6 @@ static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)
VAL != EROFS_LOCKED_MAGIC);
}
-/* we strictly follow PAGE_SIZE and no buffer head yet */
-#define LOG_BLOCK_SIZE PAGE_SHIFT
-#define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE)
-
-#if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ)
-#error erofs cannot be used in this platform
-#endif
-
enum erofs_kmap_type {
EROFS_NO_KMAP, /* don't map the buffer */
EROFS_KMAP, /* use kmap_local_page() to map the buffer */
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 4303b4e69e55..dbffcdd696df 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -333,7 +333,6 @@ static int erofs_read_superblock(struct super_block *sb)
struct erofs_sb_info *sbi;
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
struct erofs_super_block *dsb;
- unsigned int blkszbits;
void *data;
int ret;
@@ -352,6 +351,16 @@ static int erofs_read_superblock(struct super_block *sb)
goto out;
}
+ sbi->blkszbits = dsb->blkszbits;
+ if (sbi->blkszbits < 9 || sbi->blkszbits > PAGE_SHIFT) {
+ erofs_err(sb, "blkszbits %u isn't supported", sbi->blkszbits);
+ goto out;
+ }
+ if (dsb->dirblkbits) {
+ erofs_err(sb, "dirblkbits %u isn't supported", dsb->dirblkbits);
+ goto out;
+ }
+
sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
if (erofs_sb_has_sb_chksum(sbi)) {
ret = erofs_superblock_csum_verify(sb, data);
@@ -360,19 +369,11 @@ static int erofs_read_superblock(struct super_block *sb)
}
ret = -EINVAL;
- blkszbits = dsb->blkszbits;
- /* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
- if (blkszbits != LOG_BLOCK_SIZE) {
- erofs_err(sb, "blkszbits %u isn't supported on this platform",
- blkszbits);
- goto out;
- }
-
if (!check_layout_compatibility(sb, dsb))
goto out;
sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
- if (sbi->sb_size > EROFS_BLKSIZ) {
+ if (sbi->sb_size > PAGE_SIZE - EROFS_SUPER_OFFSET) {
erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
sbi->sb_size);
goto out;
@@ -739,8 +740,8 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
sbi->blkszbits = PAGE_SHIFT;
if (erofs_is_fscache_mode(sb)) {
- sb->s_blocksize = EROFS_BLKSIZ;
- sb->s_blocksize_bits = LOG_BLOCK_SIZE;
+ sb->s_blocksize = PAGE_SIZE;
+ sb->s_blocksize_bits = PAGE_SHIFT;
err = erofs_fscache_register_fs(sb);
if (err)
@@ -750,8 +751,8 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
} else {
- if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
- erofs_err(sb, "failed to set erofs blksize");
+ if (!sb_set_blocksize(sb, PAGE_SIZE)) {
+ errorfc(fc, "failed to set initial blksize");
return -EINVAL;
}
@@ -764,12 +765,24 @@ static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
if (err)
return err;
- if (test_opt(&sbi->opt, DAX_ALWAYS)) {
- BUILD_BUG_ON(EROFS_BLKSIZ != PAGE_SIZE);
+ if (sb->s_blocksize_bits != sbi->blkszbits) {
+ if (erofs_is_fscache_mode(sb)) {
+ errorfc(fc, "unsupported blksize for fscache mode");
+ return -EINVAL;
+ }
+ if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
+ errorfc(fc, "failed to set erofs blksize");
+ return -EINVAL;
+ }
+ }
+ if (test_opt(&sbi->opt, DAX_ALWAYS)) {
if (!sbi->dax_dev) {
errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
clear_opt(&sbi->opt, DAX_ALWAYS);
+ } else if (sbi->blkszbits != PAGE_SHIFT) {
+ errorfc(fc, "unsupported blocksize for DAX");
+ clear_opt(&sbi->opt, DAX_ALWAYS);
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 13:07:14 +0000