| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From: Felix Fietkau <nbd@nbd.name> |
| 2 | Subject: fs: jffs2: EOF marker |
| 3 | |
| 4 | Signed-off-by: Felix Fietkau <nbd@nbd.name> |
| 5 | --- |
| 6 | fs/jffs2/build.c | 10 ++++++++++ |
| 7 | fs/jffs2/scan.c | 21 +++++++++++++++++++-- |
| 8 | 2 files changed, 29 insertions(+), 2 deletions(-) |
| 9 | |
| 10 | --- a/fs/jffs2/build.c |
| 11 | +++ b/fs/jffs2/build.c |
| 12 | @@ -117,6 +117,16 @@ static int jffs2_build_filesystem(struct |
| 13 | dbg_fsbuild("scanned flash completely\n"); |
| 14 | jffs2_dbg_dump_block_lists_nolock(c); |
| 15 | |
| 16 | + if (c->flags & (1 << 7)) { |
| 17 | + printk("%s(): unlocking the mtd device... ", __func__); |
| 18 | + mtd_unlock(c->mtd, 0, c->mtd->size); |
| 19 | + printk("done.\n"); |
| 20 | + |
| 21 | + printk("%s(): erasing all blocks after the end marker... ", __func__); |
| 22 | + jffs2_erase_pending_blocks(c, -1); |
| 23 | + printk("done.\n"); |
| 24 | + } |
| 25 | + |
| 26 | dbg_fsbuild("pass 1 starting\n"); |
| 27 | c->flags |= JFFS2_SB_FLAG_BUILDING; |
| 28 | /* Now scan the directory tree, increasing nlink according to every dirent found. */ |
| 29 | --- a/fs/jffs2/scan.c |
| 30 | +++ b/fs/jffs2/scan.c |
| 31 | @@ -148,8 +148,14 @@ int jffs2_scan_medium(struct jffs2_sb_in |
| 32 | /* reset summary info for next eraseblock scan */ |
| 33 | jffs2_sum_reset_collected(s); |
| 34 | |
| 35 | - ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), |
| 36 | - buf_size, s); |
| 37 | + if (c->flags & (1 << 7)) { |
| 38 | + if (mtd_block_isbad(c->mtd, jeb->offset)) |
| 39 | + ret = BLK_STATE_BADBLOCK; |
| 40 | + else |
| 41 | + ret = BLK_STATE_ALLFF; |
| 42 | + } else |
| 43 | + ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset), |
| 44 | + buf_size, s); |
| 45 | |
| 46 | if (ret < 0) |
| 47 | goto out; |
| 48 | @@ -566,6 +572,17 @@ full_scan: |
| 49 | return err; |
| 50 | } |
| 51 | |
| 52 | + if ((buf[0] == 0xde) && |
| 53 | + (buf[1] == 0xad) && |
| 54 | + (buf[2] == 0xc0) && |
| 55 | + (buf[3] == 0xde)) { |
| 56 | + /* end of filesystem. erase everything after this point */ |
| 57 | + printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset); |
| 58 | + c->flags |= (1 << 7); |
| 59 | + |
| 60 | + return BLK_STATE_ALLFF; |
| 61 | + } |
| 62 | + |
| 63 | /* We temporarily use 'ofs' as a pointer into the buffer/jeb */ |
| 64 | ofs = 0; |
| 65 | max_ofs = EMPTY_SCAN_SIZE(c->sector_size); |