[PATCH 2/2] mkfs.f2fs: add device aliasing feature

From: Daeho Jeong
Date: Fri Sep 13 2024 - 17:28:28 EST

From: Daeho Jeong <daehojeong@xxxxxxxxxx>

We can add a device aliasing file which can map the whole device with an
extent, not using node blocks. This mapped area should be pinned and
normally used for read-only usages. After finished using it, we can
deallocate the whole area and return it back to use it for other files.

Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
---
fsck/dump.c | 13 ++
fsck/fsck.c | 49 ++++--
fsck/fsck.h | 4 +-
fsck/main.c | 5 +
include/f2fs_fs.h | 11 ++
mkfs/f2fs_format.c | 335 ++++++++++++++++++++++++++++++++--------
mkfs/f2fs_format_main.c | 30 +++-
7 files changed, 363 insertions(+), 84 deletions(-)

diff --git a/fsck/dump.c b/fsck/dump.c
index 8d5613e..aa9b5d3 100644
--- a/fsck/dump.c
+++ b/fsck/dump.c
@@ -499,6 +499,19 @@ static int dump_inode_blk(struct f2fs_sb_info *sbi, u32 nid,
}

c.show_file_map_max_offset = f2fs_max_file_offset(&node_blk->i);
+
+ if (IS_ALIASING(&node_blk->i)) {
+ u32 blkaddr = le32_to_cpu(node_blk->i.i_ext.blk_addr);
+ u32 len = le32_to_cpu(node_blk->i.i_ext.len);
+ u32 idx;
+
+ for (idx = 0; idx < len; idx++)
+ dump_data_blk(sbi, idx * F2FS_BLKSIZE, blkaddr++, false);
+ print_extent(true);
+
+ goto dump_xattr;
+ }
+
addr_per_block = ADDRS_PER_BLOCK(&node_blk->i);

/* check data blocks in inode */
diff --git a/fsck/fsck.c b/fsck/fsck.c
index f8607fd..6feb294 100644
--- a/fsck/fsck.c
+++ b/fsck/fsck.c
@@ -914,6 +914,7 @@ void fsck_chk_inode_blk(struct f2fs_sb_info *sbi, u32 nid,
int need_fix = 0;
int ret;
u32 cluster_size = 1 << node_blk->i.i_log_cluster_size;
+ bool is_aliasing = IS_ALIASING(&node_blk->i);

if (!compressed)
goto check_next;
@@ -1146,6 +1147,33 @@ check_next:
addrs_per_blk * NIDS_PER_BLOCK *
NIDS_PER_BLOCK) * F2FS_BLKSIZE;
}
+
+ if (is_aliasing) {
+ struct extent_info ei;
+
+ get_extent_info(&ei, &node_blk->i.i_ext);
+ for (idx = 0; idx < ei.len; idx++, child.pgofs++) {
+ block_t blkaddr = ei.blk + idx;
+
+ /* check extent info */
+ check_extent_info(&child, blkaddr, 0);
+ ret = fsck_chk_data_blk(sbi, &node_blk->i, blkaddr,
+ &child, (i_blocks == *blk_cnt), ftype, nid,
+ idx, ni->version, node_blk);
+ if (!ret) {
+ *blk_cnt = *blk_cnt + 1;
+ if (cur_qtype != -1)
+ qf_last_blkofs[cur_qtype] = child.pgofs;
+ } else if (c.fix_on) {
+ node_blk->i.i_ext.len = cpu_to_le32(idx);
+ need_fix = 1;
+ break;
+ }
+ }
+
+ goto check;
+ }
+
for (idx = 0; idx < addrs; idx++, child.pgofs++) {
block_t blkaddr = le32_to_cpu(node_blk->i.i_addr[ofs + idx]);

@@ -1178,11 +1206,11 @@ check_next:
child.pgofs - cbc->cheader_pgofs < cluster_size)
cbc->cnt++;
ret = fsck_chk_data_blk(sbi,
- IS_CASEFOLDED(&node_blk->i),
+ &node_blk->i,
blkaddr,
&child, (i_blocks == *blk_cnt),
ftype, nid, idx, ni->version,
- file_is_encrypt(&node_blk->i), node_blk);
+ node_blk);
if (blkaddr != le32_to_cpu(node_blk->i.i_addr[ofs + idx]))
need_fix = 1;
if (!ret) {
@@ -1376,7 +1404,7 @@ skip_blkcnt_fix:
}

/* drop extent information to avoid potential wrong access */
- if (need_fix && f2fs_dev_is_writable())
+ if (need_fix && f2fs_dev_is_writable() && !is_aliasing)
node_blk->i.i_ext.len = 0;

if ((c.feature & F2FS_FEATURE_INODE_CHKSUM) &&
@@ -1448,11 +1476,9 @@ int fsck_chk_dnode_blk(struct f2fs_sb_info *sbi, struct f2fs_inode *inode,
if (!compr_rel && blkaddr == NEW_ADDR && child->pgofs -
cbc->cheader_pgofs < cluster_size)
cbc->cnt++;
- ret = fsck_chk_data_blk(sbi, IS_CASEFOLDED(inode),
- blkaddr, child,
+ ret = fsck_chk_data_blk(sbi, inode, blkaddr, child,
le64_to_cpu(inode->i_blocks) == *blk_cnt, ftype,
- nid, idx, ni->version,
- file_is_encrypt(inode), node_blk);
+ nid, idx, ni->version, node_blk);
if (blkaddr != le32_to_cpu(node_blk->dn.addr[idx]))
need_fix = 1;
if (!ret) {
@@ -2056,12 +2082,15 @@ int fsck_chk_dentry_blk(struct f2fs_sb_info *sbi, int casefolded, u32 blk_addr,
return 0;
}

-int fsck_chk_data_blk(struct f2fs_sb_info *sbi, int casefolded,
+int fsck_chk_data_blk(struct f2fs_sb_info *sbi, struct f2fs_inode *inode,
u32 blk_addr, struct child_info *child, int last_blk,
enum FILE_TYPE ftype, u32 parent_nid, u16 idx_in_node, u8 ver,
- int enc_name, struct f2fs_node *node_blk)
+ struct f2fs_node *node_blk)
{
struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
+ int casefolded = IS_CASEFOLDED(inode);
+ int enc_name = file_is_encrypt(inode);
+ int aliasing = IS_ALIASING(inode);

/* Is it reserved block? */
if (blk_addr == NEW_ADDR) {
@@ -2074,7 +2103,7 @@ int fsck_chk_data_blk(struct f2fs_sb_info *sbi, int casefolded,
return -EINVAL;
}

- if (is_valid_ssa_data_blk(sbi, blk_addr, parent_nid,
+ if (!aliasing && is_valid_ssa_data_blk(sbi, blk_addr, parent_nid,
idx_in_node, ver)) {
ASSERT_MSG("summary data block is not valid. [0x%x]",
parent_nid);
diff --git a/fsck/fsck.h b/fsck/fsck.h
index 6cac926..d306c22 100644
--- a/fsck/fsck.h
+++ b/fsck/fsck.h
@@ -179,9 +179,9 @@ extern int fsck_chk_idnode_blk(struct f2fs_sb_info *, struct f2fs_inode *,
extern int fsck_chk_didnode_blk(struct f2fs_sb_info *, struct f2fs_inode *,
enum FILE_TYPE, struct f2fs_node *, u32 *,
struct f2fs_compr_blk_cnt *, struct child_info *);
-extern int fsck_chk_data_blk(struct f2fs_sb_info *, int,
+extern int fsck_chk_data_blk(struct f2fs_sb_info *, struct f2fs_inode *,
u32, struct child_info *, int, enum FILE_TYPE, u32, u16, u8,
- int, struct f2fs_node *);
+ struct f2fs_node *);
extern int fsck_chk_dentry_blk(struct f2fs_sb_info *, int,
u32, struct child_info *, int, int, struct f2fs_node *);
int fsck_chk_inline_dentries(struct f2fs_sb_info *, struct f2fs_node *,
diff --git a/fsck/main.c b/fsck/main.c
index c13e287..c4f6167 100644
--- a/fsck/main.c
+++ b/fsck/main.c
@@ -976,6 +976,11 @@ static int do_defrag(struct f2fs_sb_info *sbi)
return -1;
}

+ if (get_sb(feature) & F2FS_FEATURE_DEVICE_ALIAS) {
+ MSG(0, "Not support on image with device aliasing feature.\n");
+ return -1;
+ }
+
if (c.defrag_start > get_sb(block_count))
goto out_range;
if (c.defrag_start < SM_I(sbi)->main_blkaddr)
diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index fdbc25b..108fde3 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -442,6 +442,7 @@ struct device_info {
uint64_t start_blkaddr;
uint64_t end_blkaddr;
uint32_t total_segments;
+ char *alias_filename;

/* to handle zone block devices */
int zoned_model;
@@ -661,7 +662,13 @@ enum {
*/
#define F2FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
#define F2FS_NOATIME_FL 0x00000080 /* do not update atime */
+#define F2FS_DEVICE_ALIAS_FL 0x80000000 /* File for aliasing a device */
+#define IS_ALIASING(fi) ((fi)->i_flags & cpu_to_le32(F2FS_DEVICE_ALIAS_FL))

+/*
+ * On-disk file inline flags (f2fs_inode::i_inline)
+ */
+#define F2FS_PIN_FILE 0x40 /* file should not be gced */

#define F2FS_ENC_UTF8_12_1 1
#define F2FS_ENC_STRICT_MODE_FL (1 << 0)
@@ -694,6 +701,7 @@ enum {
#define F2FS_FEATURE_CASEFOLD 0x1000
#define F2FS_FEATURE_COMPRESSION 0x2000
#define F2FS_FEATURE_RO 0x4000
+#define F2FS_FEATURE_DEVICE_ALIAS 0x8000

#define MAX_NR_FEATURE 32

@@ -1515,11 +1523,14 @@ struct f2fs_configuration {
time_t fixed_time;
int roll_forward;
bool need_fsync;
+ int aliased_devices;
+ uint32_t aliased_segments;

/* mkfs parameters */
int fake_seed;
uint32_t next_free_nid;
uint32_t lpf_ino;
+ uint32_t first_alias_ino;
uint32_t root_uid;
uint32_t root_gid;
uint32_t blksize;
diff --git a/mkfs/f2fs_format.c b/mkfs/f2fs_format.c
index db1bc89..077f620 100644
--- a/mkfs/f2fs_format.c
+++ b/mkfs/f2fs_format.c
@@ -13,6 +13,7 @@
#include <unistd.h>
#include <f2fs_fs.h>
#include <assert.h>
+#include <stdbool.h>

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
@@ -39,10 +40,62 @@ struct f2fs_super_block raw_sb;
struct f2fs_super_block *sb = &raw_sb;
struct f2fs_checkpoint *cp;

+static inline bool device_is_aliased(unsigned int dev_num)
+{
+ if (dev_num >= c.ndevs)
+ return false;
+ return c.devices[dev_num].alias_filename != NULL;
+}
+
+static inline unsigned int target_device_index(uint64_t blkaddr)
+{
+ int i;
+
+ for (i = 0; i < c.ndevs; i++)
+ if (c.devices[i].start_blkaddr <= blkaddr &&
+ c.devices[i].end_blkaddr >= blkaddr)
+ return i;
+ return 0;
+}
+
+#define GET_SEGNO(blk_addr) ((blk_addr - get_sb(main_blkaddr)) / \
+ c.blks_per_seg)
+#define START_BLOCK(segno) (segno * c.blks_per_seg + get_sb(main_blkaddr))
+
/* Return first segment number of each area */
-#define prev_zone(cur) (c.cur_seg[cur] - c.segs_per_zone)
-#define next_zone(cur) (c.cur_seg[cur] + c.segs_per_zone)
-#define last_zone(cur) ((cur - 1) * c.segs_per_zone)
+static inline uint32_t next_zone(int seg_type)
+{
+ uint32_t next_seg = c.cur_seg[seg_type] + c.segs_per_zone;
+ uint64_t next_blkaddr = START_BLOCK(next_seg);
+ int dev_num;
+
+ dev_num = target_device_index(next_blkaddr);
+ if (!device_is_aliased(dev_num))
+ return GET_SEGNO(next_blkaddr);
+
+ while (dev_num < c.ndevs && device_is_aliased(dev_num))
+ dev_num++;
+
+ return GET_SEGNO(c.devices[dev_num - 1].end_blkaddr + 1);
+}
+
+static inline uint32_t last_zone(uint32_t total_zone)
+{
+ uint32_t last_seg = (total_zone - 1) * c.segs_per_zone;
+ uint64_t last_blkaddr = START_BLOCK(last_seg);
+ int dev_num;
+
+ dev_num = target_device_index(last_blkaddr);
+ if (!device_is_aliased(dev_num))
+ return GET_SEGNO(last_blkaddr);
+
+ while (dev_num > 0 && device_is_aliased(dev_num))
+ dev_num--;
+
+ return GET_SEGNO(c.devices[dev_num + 1].start_blkaddr) -
+ c.segs_per_zone;
+}
+
#define last_section(cur) (cur + (c.secs_per_zone - 1) * c.segs_per_sec)

/* Return time fixed by the user or current time by default */
@@ -220,7 +273,7 @@ static int f2fs_prepare_super_block(void)
uint64_t total_meta_zones, total_meta_segments;
uint32_t sit_bitmap_size, max_sit_bitmap_size;
uint32_t max_nat_bitmap_size, max_nat_segments;
- uint32_t total_zones, avail_zones;
+ uint32_t total_zones, avail_zones = 0;
enum quota_type qtype;
int i;

@@ -314,6 +367,16 @@ static int f2fs_prepare_super_block(void)
c.devices[i].end_blkaddr = c.devices[i].start_blkaddr +
c.devices[i].total_segments *
c.blks_per_seg - 1;
+ if (device_is_aliased(i)) {
+ if (c.devices[i].zoned_model ==
+ F2FS_ZONED_HM) {
+ MSG(1, "\tError: do not support "
+ "device aliasing for device[%d]\n", i);
+ return -1;
+ }
+ c.aliased_segments +=
+ c.devices[i].total_segments;
+ }
}
if (c.ndevs > 1) {
memcpy(sb->devs[i].path, c.devices[i].path, MAX_PATH_LEN);
@@ -531,10 +594,16 @@ static int f2fs_prepare_super_block(void)
if (c.feature & F2FS_FEATURE_LOST_FOUND)
c.lpf_ino = c.next_free_nid++;

+ if (c.aliased_devices) {
+ c.first_alias_ino = c.next_free_nid;
+ c.next_free_nid += c.aliased_devices;
+ avail_zones += c.aliased_segments / c.segs_per_zone;
+ }
+
if (c.feature & F2FS_FEATURE_RO)
- avail_zones = 2;
+ avail_zones += 2;
else
- avail_zones = 6;
+ avail_zones += 6;

if (total_zones <= avail_zones) {
MSG(1, "\tError: %d zones: Need more zones "
@@ -701,6 +770,7 @@ static int f2fs_write_check_point_pack(void)
char *sum_compact, *sum_compact_p;
struct f2fs_summary *sum_entry;
unsigned short vblocks;
+ uint32_t used_segments = c.aliased_segments;
int ret = -1;

cp = calloc(F2FS_BLKSIZE, 1);
@@ -752,9 +822,14 @@ static int f2fs_write_check_point_pack(void)
}

set_cp(cur_node_blkoff[0], c.curseg_offset[CURSEG_HOT_NODE]);
+ set_cp(cur_node_blkoff[2], c.curseg_offset[CURSEG_COLD_NODE]);
set_cp(cur_data_blkoff[0], c.curseg_offset[CURSEG_HOT_DATA]);
+ set_cp(cur_data_blkoff[2], c.curseg_offset[CURSEG_COLD_DATA]);
set_cp(valid_block_count, c.curseg_offset[CURSEG_HOT_NODE] +
- c.curseg_offset[CURSEG_HOT_DATA]);
+ c.curseg_offset[CURSEG_HOT_DATA] +
+ c.curseg_offset[CURSEG_COLD_NODE] +
+ c.curseg_offset[CURSEG_COLD_DATA] +
+ c.aliased_segments * c.blks_per_seg);
set_cp(rsvd_segment_count, c.reserved_segments);

/*
@@ -802,15 +877,16 @@ static int f2fs_write_check_point_pack(void)
c.reserved_segments);

/* main segments - reserved segments - (node + data segments) */
- if (c.feature & F2FS_FEATURE_RO) {
- set_cp(free_segment_count, f2fs_get_usable_segments(sb) - 2);
- set_cp(user_block_count, ((get_cp(free_segment_count) + 2 -
- get_cp(overprov_segment_count)) * c.blks_per_seg));
- } else {
- set_cp(free_segment_count, f2fs_get_usable_segments(sb) - 6);
- set_cp(user_block_count, ((get_cp(free_segment_count) + 6 -
- get_cp(overprov_segment_count)) * c.blks_per_seg));
- }
+ if (c.feature & F2FS_FEATURE_RO)
+ used_segments += 2;
+ else
+ used_segments += 6;
+
+ set_cp(user_block_count, (f2fs_get_usable_segments(sb) -
+ get_cp(overprov_segment_count)) * c.blks_per_seg);
+ set_cp(free_segment_count, f2fs_get_usable_segments(sb) -
+ used_segments);
+
/* cp page (2), data summaries (1), node summaries (3) */
set_cp(cp_pack_total_block_count, 6 + get_sb(cp_payload));
flags = CP_UMOUNT_FLAG | CP_COMPACT_SUM_FLAG;
@@ -826,8 +902,10 @@ static int f2fs_write_check_point_pack(void)

set_cp(ckpt_flags, flags);
set_cp(cp_pack_start_sum, 1 + get_sb(cp_payload));
- set_cp(valid_node_count, c.curseg_offset[CURSEG_HOT_NODE]);
- set_cp(valid_inode_count, c.curseg_offset[CURSEG_HOT_NODE]);
+ set_cp(valid_node_count, c.curseg_offset[CURSEG_HOT_NODE] +
+ c.curseg_offset[CURSEG_COLD_NODE]);
+ set_cp(valid_inode_count, c.curseg_offset[CURSEG_HOT_NODE] +
+ c.curseg_offset[CURSEG_COLD_NODE]);
set_cp(next_free_nid, c.next_free_nid);
set_cp(sit_ver_bitmap_bytesize, ((get_sb(segment_count_sit) / 2) <<
get_sb(log_blocks_per_seg)) / 8);
@@ -975,9 +1053,12 @@ static int f2fs_write_check_point_pack(void)
goto free_cp_payload;
}

- /* Fill segment summary for COLD_NODE to zero. */
+ /* Prepare and write Segment summary for COLD_NODE */
memset(sum, 0, F2FS_BLKSIZE);
SET_SUM_TYPE(sum, SUM_TYPE_NODE);
+ memcpy(sum->entries, c.sum[CURSEG_COLD_NODE],
+ sizeof(struct f2fs_summary) * MAX_CACHE_SUMS);
+
cp_seg_blk++;
DBG(1, "\tWriting Segment summary for COLD_NODE, at offset 0x%08"PRIx64"\n",
cp_seg_blk);
@@ -1210,10 +1291,40 @@ void update_summary_entry(int curseg_type, nid_t nid,
sum->ofs_in_node = cpu_to_le16(ofs_in_node);
}

+static void add_dentry(struct f2fs_dentry_block *dent_blk, unsigned int *didx,
+ const char *name, uint32_t ino, u8 type)
+{
+ int len = strlen(name);
+ f2fs_hash_t hash;
+
+ if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.')))
+ hash = 0;
+ else
+ hash = f2fs_dentry_hash(0, 0, (unsigned char *)name, len);
+
+ F2FS_DENTRY_BLOCK_DENTRY(dent_blk, *didx).hash_code = cpu_to_le32(hash);
+ F2FS_DENTRY_BLOCK_DENTRY(dent_blk, *didx).ino = cpu_to_le32(ino);
+ F2FS_DENTRY_BLOCK_DENTRY(dent_blk, *didx).name_len = cpu_to_le16(len);
+ F2FS_DENTRY_BLOCK_DENTRY(dent_blk, *didx).file_type = type;
+
+ while (len > F2FS_SLOT_LEN) {
+ memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, *didx), name,
+ F2FS_SLOT_LEN);
+ test_and_set_bit_le(*didx, dent_blk->dentry_bitmap);
+ len -= (int)F2FS_SLOT_LEN;
+ name += F2FS_SLOT_LEN;
+ (*didx)++;
+ }
+ memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, *didx), name, len);
+ test_and_set_bit_le(*didx, dent_blk->dentry_bitmap);
+ (*didx)++;
+}
+
static block_t f2fs_add_default_dentry_root(void)
{
struct f2fs_dentry_block *dent_blk = NULL;
block_t data_blkaddr;
+ unsigned int didx = 0;

dent_blk = calloc(F2FS_BLKSIZE, 1);
if(dent_blk == NULL) {
@@ -1221,37 +1332,26 @@ static block_t f2fs_add_default_dentry_root(void)
return 0;
}

- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).hash_code = 0;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).ino = sb->root_ino;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).name_len = cpu_to_le16(1);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).file_type = F2FS_FT_DIR;
- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 0), ".", 1);
+ add_dentry(dent_blk, &didx, ".",
+ le32_to_cpu(sb->root_ino), F2FS_FT_DIR);
+ add_dentry(dent_blk, &didx, "..",
+ le32_to_cpu(sb->root_ino), F2FS_FT_DIR);

- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).hash_code = 0;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).ino = sb->root_ino;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).name_len = cpu_to_le16(2);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).file_type = F2FS_FT_DIR;
- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 1), "..", 2);
-
- /* bitmap for . and .. */
- test_and_set_bit_le(0, dent_blk->dentry_bitmap);
- test_and_set_bit_le(1, dent_blk->dentry_bitmap);
-
- if (c.lpf_ino) {
- int len = strlen(LPF);
- f2fs_hash_t hash = f2fs_dentry_hash(0, 0, (unsigned char *)LPF, len);
+ if (c.lpf_ino)
+ add_dentry(dent_blk, &didx, LPF, c.lpf_ino, F2FS_FT_DIR);

- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 2).hash_code = cpu_to_le32(hash);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 2).ino = cpu_to_le32(c.lpf_ino);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 2).name_len = cpu_to_le16(len);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 2).file_type = F2FS_FT_DIR;
- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 2), LPF, F2FS_SLOT_LEN);
+ if (c.aliased_devices) {
+ int i, dev_off = 0;

- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 3), &LPF[F2FS_SLOT_LEN],
- len - F2FS_SLOT_LEN);
+ for (i = 1; i < c.ndevs; i++) {
+ if (!device_is_aliased(i))
+ continue;

- test_and_set_bit_le(2, dent_blk->dentry_bitmap);
- test_and_set_bit_le(3, dent_blk->dentry_bitmap);
+ add_dentry(dent_blk, &didx, c.devices[i].alias_filename,
+ c.first_alias_ino + dev_off,
+ F2FS_FT_REG_FILE);
+ dev_off++;
+ }
}

data_blkaddr = alloc_next_free_block(CURSEG_HOT_DATA);
@@ -1324,6 +1424,7 @@ static int f2fs_write_default_quota(int qtype, __le32 raw_id)
struct v2_disk_dqinfo ddqinfo;
struct v2r1_disk_dqblk dqblk;
block_t blkaddr;
+ uint64_t icnt = 1, bcnt = 1;
int i;

if (filebuf == NULL) {
@@ -1359,16 +1460,18 @@ static int f2fs_write_default_quota(int qtype, __le32 raw_id)
dqblk.dqb_pad = cpu_to_le32(0);
dqblk.dqb_ihardlimit = cpu_to_le64(0);
dqblk.dqb_isoftlimit = cpu_to_le64(0);
- if (c.lpf_ino)
- dqblk.dqb_curinodes = cpu_to_le64(2);
- else
- dqblk.dqb_curinodes = cpu_to_le64(1);
+ if (c.lpf_ino) {
+ icnt++;
+ bcnt++;
+ }
+ if (c.aliased_devices) {
+ icnt += c.aliased_devices;
+ bcnt += c.aliased_segments * c.blks_per_seg;
+ }
+ dqblk.dqb_curinodes = cpu_to_le64(icnt);
dqblk.dqb_bhardlimit = cpu_to_le64(0);
dqblk.dqb_bsoftlimit = cpu_to_le64(0);
- if (c.lpf_ino)
- dqblk.dqb_curspace = cpu_to_le64(F2FS_BLKSIZE * 2);
- else
- dqblk.dqb_curspace = cpu_to_le64(F2FS_BLKSIZE);
+ dqblk.dqb_curspace = cpu_to_le64(F2FS_BLKSIZE * bcnt);
dqblk.dqb_btime = cpu_to_le64(0);
dqblk.dqb_itime = cpu_to_le64(0);

@@ -1491,6 +1594,7 @@ static block_t f2fs_add_default_dentry_lpf(void)
{
struct f2fs_dentry_block *dent_blk;
block_t data_blkaddr;
+ unsigned int didx = 0;

dent_blk = calloc(F2FS_BLKSIZE, 1);
if (dent_blk == NULL) {
@@ -1498,20 +1602,8 @@ static block_t f2fs_add_default_dentry_lpf(void)
return 0;
}

- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).hash_code = 0;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).ino = cpu_to_le32(c.lpf_ino);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).name_len = cpu_to_le16(1);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 0).file_type = F2FS_FT_DIR;
- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 0), ".", 1);
-
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).hash_code = 0;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).ino = sb->root_ino;
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).name_len = cpu_to_le16(2);
- F2FS_DENTRY_BLOCK_DENTRY(dent_blk, 1).file_type = F2FS_FT_DIR;
- memcpy(F2FS_DENTRY_BLOCK_FILENAME(dent_blk, 1), "..", 2);
-
- test_and_set_bit_le(0, dent_blk->dentry_bitmap);
- test_and_set_bit_le(1, dent_blk->dentry_bitmap);
+ add_dentry(dent_blk, &didx, ".", c.lpf_ino, F2FS_FT_DIR);
+ add_dentry(dent_blk, &didx, "..", c.lpf_ino, F2FS_FT_DIR);

data_blkaddr = alloc_next_free_block(CURSEG_HOT_DATA);

@@ -1579,6 +1671,104 @@ exit:
return err;
}

+static void allocate_blocks_for_aliased_device(struct f2fs_node *raw_node,
+ unsigned int dev_num)
+{
+ uint32_t start_segno = (c.devices[dev_num].start_blkaddr -
+ get_sb(main_blkaddr)) / c.blks_per_seg;
+ uint32_t end_segno = (c.devices[dev_num].end_blkaddr -
+ get_sb(main_blkaddr) + 1) / c.blks_per_seg;
+ uint32_t segno;
+ uint64_t blkcnt;
+ struct f2fs_sit_block *sit_blk = calloc(F2FS_BLKSIZE, 1);
+
+ ASSERT(sit_blk);
+
+ for (segno = start_segno; segno < end_segno; segno++) {
+ struct f2fs_sit_entry *sit;
+ uint64_t sit_blk_addr = get_sb(sit_blkaddr) +
+ (segno / SIT_ENTRY_PER_BLOCK);
+
+ ASSERT(dev_read_block(sit_blk, sit_blk_addr) >= 0);
+ sit = &sit_blk->entries[segno % SIT_ENTRY_PER_BLOCK];
+ memset(&sit->valid_map, 0xFF, SIT_VBLOCK_MAP_SIZE);
+ sit->vblocks = cpu_to_le16((CURSEG_COLD_DATA <<
+ SIT_VBLOCKS_SHIFT) | c.blks_per_seg);
+ sit->mtime = cpu_to_le64(mkfs_time);
+ ASSERT(dev_write_block(sit_blk, sit_blk_addr) >= 0);
+ }
+
+ blkcnt = (end_segno - start_segno) * c.blks_per_seg;
+ raw_node->i.i_size = cpu_to_le64(blkcnt << get_sb(log_blocksize));
+ raw_node->i.i_blocks = cpu_to_le64(blkcnt + 1);
+
+ raw_node->i.i_ext.fofs = cpu_to_le32(0);
+ raw_node->i.i_ext.blk_addr =
+ cpu_to_le32(c.devices[dev_num].start_blkaddr);
+ raw_node->i.i_ext.len = cpu_to_le32(blkcnt);
+
+ free(sit_blk);
+}
+
+static int f2fs_write_alias_inodes(void)
+{
+ struct f2fs_node *raw_node;
+ block_t node_blkaddr;
+ int err = 0;
+ unsigned int i, dev_off = 0;
+
+ ASSERT(c.aliased_devices);
+
+ raw_node = calloc(F2FS_BLKSIZE, 1);
+ if (raw_node == NULL) {
+ MSG(1, "\tError: Calloc Failed for raw_node!!!\n");
+ return -1;
+ }
+
+ for (i = 1; i < c.ndevs; i++) {
+ const char *filename;
+ nid_t ino;
+
+ if (!device_is_aliased(i))
+ continue;
+
+ ino = c.first_alias_ino + dev_off;
+ dev_off++;
+ f2fs_init_inode(sb, raw_node, ino, mkfs_time, 0x81c0);
+
+ raw_node->i.i_flags = cpu_to_le32(F2FS_IMMUTABLE_FL |
+ F2FS_DEVICE_ALIAS_FL);
+ raw_node->i.i_inline = F2FS_PIN_FILE;
+ raw_node->i.i_pino = sb->root_ino;
+ filename = c.devices[i].alias_filename;
+ raw_node->i.i_namelen = cpu_to_le32(strlen(filename));
+ memcpy(raw_node->i.i_name, filename, strlen(filename));
+
+ node_blkaddr = alloc_next_free_block(CURSEG_COLD_NODE);
+ F2FS_NODE_FOOTER(raw_node)->next_blkaddr =
+ cpu_to_le32(node_blkaddr + 1);
+
+ allocate_blocks_for_aliased_device(raw_node, i);
+
+ DBG(1, "\tWriting aliased device inode (cold node), "
+ "offset 0x%x\n", node_blkaddr);
+ if (write_inode(raw_node, node_blkaddr) < 0) {
+ MSG(1, "\tError: While writing the raw_node to "
+ "disk!!!\n");
+ err = -1;
+ goto exit;
+ }
+
+ update_nat_journal(ino, node_blkaddr);
+ update_sit_journal(CURSEG_COLD_NODE);
+ update_summary_entry(CURSEG_COLD_NODE, ino, 0);
+ }
+
+exit:
+ free(raw_node);
+ return err;
+}
+
static int f2fs_create_root_dir(void)
{
enum quota_type qtype;
@@ -1608,6 +1798,15 @@ static int f2fs_create_root_dir(void)
}
}

+ if (c.aliased_devices) {
+ err = f2fs_write_alias_inodes();
+ if (err < 0) {
+ MSG(1, "\tError: Failed to write aliased device "
+ "inodes!!!\n");
+ goto exit;
+ }
+ }
+
#ifndef WITH_ANDROID
err = f2fs_discard_obsolete_dnode();
if (err < 0) {
diff --git a/mkfs/f2fs_format_main.c b/mkfs/f2fs_format_main.c
index 2ba1c21..b113bbc 100644
--- a/mkfs/f2fs_format_main.c
+++ b/mkfs/f2fs_format_main.c
@@ -50,7 +50,7 @@ static void mkfs_usage()
MSG(0, "\nUsage: mkfs.f2fs [options] device [sectors]\n");
MSG(0, "[options]:\n");
MSG(0, " -b filesystem block size [default:4096]\n");
- MSG(0, " -c [device_name] up to 7 additional devices, except meta device\n");
+ MSG(0, " -c [device_name[@alias_filename]] up to 7 additional devices, except meta device\n");
MSG(0, " -d debug level [default:0]\n");
MSG(0, " -e [cold file ext list] e.g. \"mp3,gif,mov\"\n");
MSG(0, " -E [hot file ext list] e.g. \"db\"\n");
@@ -105,6 +105,9 @@ static void f2fs_show_info()

if (c.feature & F2FS_FEATURE_COMPRESSION)
MSG(0, "Info: Enable Compression\n");
+
+ if (c.feature & F2FS_FEATURE_DEVICE_ALIAS)
+ MSG(0, "Info: Enable device aliasing\n");
}

#if defined(ANDROID_TARGET) && defined(HAVE_SYS_UTSNAME_H)
@@ -181,6 +184,7 @@ static void f2fs_parse_options(int argc, char *argv[])
int32_t option=0;
int val;
char *token;
+ int dev_num;

while ((option = getopt_long(argc,argv,option_string,long_opts,NULL)) != EOF) {
switch (option) {
@@ -200,17 +204,35 @@ static void f2fs_parse_options(int argc, char *argv[])
}
break;
case 'c':
- if (c.ndevs >= MAX_DEVICES) {
+ dev_num = c.ndevs;
+
+ if (dev_num >= MAX_DEVICES) {
MSG(0, "Error: Too many devices\n");
mkfs_usage();
}

- if (strlen(optarg) > MAX_PATH_LEN) {
+ token = strtok(optarg, "@");
+ if (strlen(token) > MAX_PATH_LEN) {
MSG(0, "Error: device path should be less than "
"%d characters\n", MAX_PATH_LEN);
mkfs_usage();
}
- c.devices[c.ndevs++].path = strdup(optarg);
+ c.devices[dev_num].path = strdup(token);
+ token = strtok(NULL, "");
+ if (token) {
+ if (strlen(token) > MAX_PATH_LEN) {
+ MSG(0, "Error: alias_filename should "
+ "be less than %d characters\n",
+ MAX_PATH_LEN);
+ mkfs_usage();
+ }
+ c.devices[dev_num].alias_filename =
+ strdup(token);
+ if (!c.aliased_devices)
+ c.feature |= F2FS_FEATURE_DEVICE_ALIAS;
+ c.aliased_devices++;
+ }
+ c.ndevs++;
break;
case 'd':
c.dbg_lv = atoi(optarg);
--
2.46.0.662.g92d0881bb0-goog