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Message-ID: <CACOAw_zTWUSDpn33LuYNFVkdSD2+xq6kKvrk_LLqE1mckWh9vw@mail.gmail.com>
Date: Mon, 16 Sep 2024 07:41:41 -0700
From: Daeho Jeong <daeho43@...il.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
kernel-team@...roid.com, Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH 2/2] mkfs.f2fs: add device aliasing feature
On Fri, Sep 13, 2024 at 3:27 PM Jaegeuk Kim <jaegeuk@...nel.org> wrote:
>
> On 09/13, Daeho Jeong wrote:
> > From: Daeho Jeong <daehojeong@...gle.com>
> >
> > 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@...gle.com>
> > ---
> > 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))
>
> Could you please rebase on the latest f2fs-tools? I got merge conflict around
> here.
Let me rebase it.
>
> >
> > +/*
> > + * On-disk file inline flags (f2fs_inode::i_inline)
> > + */
> > +#define F2FS_PIN_FILE 0x40 /* file should not be gced */
>
> Do we need the above define?
We need this to set F2FS_PIN_FILE to device aliasing files.
>
> >
> > #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
> >
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