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ufs: fix ufs_read_cylinder() failure handling

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1) ufs_load_cylinder() should return NULL on ufs_read_cylinder() failures.
ufs_error() is not enough.  As it is, IO failure on attempt to read a part
of cylinder group metadata is likely to end up with an oops.

2) we drop the wrong buffer heads when undoing sb_bread() on IO failure
halfway through the read - we need to brelse() what we've got from
sb_bread(), TYVM...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2023-12-13 11:20:44 -05:00
parent 7f71d6e346
commit 0bfd3e1078
1 changed files with 18 additions and 13 deletions
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31
fs/ufs/cylinder.c
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@ -26,7 +26,7 @@
* Read cylinder group into cache. The memory space for ufs_cg_private_info
* structure is already allocated during ufs_read_super.
*/
static void ufs_read_cylinder (struct super_block * sb,
static bool ufs_read_cylinder(struct super_block *sb,
unsigned cgno, unsigned bitmap_nr)
{
struct ufs_sb_info * sbi = UFS_SB(sb);
@ -46,9 +46,11 @@ static void ufs_read_cylinder (struct super_block * sb,
* We have already the first fragment of cylinder group block in buffer
*/
UCPI_UBH(ucpi)->bh[0] = sbi->s_ucg[cgno];
for (i = 1; i < UCPI_UBH(ucpi)->count; i++)
if (!(UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i)))
for (i = 1; i < UCPI_UBH(ucpi)->count; i++) {
UCPI_UBH(ucpi)->bh[i] = sb_bread(sb, UCPI_UBH(ucpi)->fragment + i);
if (!UCPI_UBH(ucpi)->bh[i])
goto failed;
}
sbi->s_cgno[bitmap_nr] = cgno;
ucpi->c_cgx = fs32_to_cpu(sb, ucg->cg_cgx);
@ -67,13 +69,14 @@ static void ufs_read_cylinder (struct super_block * sb,
ucpi->c_clusteroff = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_clusteroff);
ucpi->c_nclusterblks = fs32_to_cpu(sb, ucg->cg_u.cg_44.cg_nclusterblks);
UFSD("EXIT\n");
return;
return true;
failed:
for (j = 1; j < i; j++)
brelse (sbi->s_ucg[j]);
brelse(UCPI_UBH(ucpi)->bh[j]);
sbi->s_cgno[bitmap_nr] = UFS_CGNO_EMPTY;
ufs_error (sb, "ufs_read_cylinder", "can't read cylinder group block %u", cgno);
return false;
}
/*
@ -156,15 +159,14 @@ struct ufs_cg_private_info * ufs_load_cylinder (
UFSD("EXIT (FAILED)\n");
return NULL;
}
else {
UFSD("EXIT\n");
return sbi->s_ucpi[cgno];
}
} else {
ufs_read_cylinder (sb, cgno, cgno);
UFSD("EXIT\n");
return sbi->s_ucpi[cgno];
if (unlikely(!ufs_read_cylinder (sb, cgno, cgno))) {
UFSD("EXIT (FAILED)\n");
return NULL;
}
}
UFSD("EXIT\n");
return sbi->s_ucpi[cgno];
}
/*
* Cylinder group number cg is in cache but it was not last used,
@ -195,7 +197,10 @@ struct ufs_cg_private_info * ufs_load_cylinder (
sbi->s_ucpi[j] = sbi->s_ucpi[j-1];
}
sbi->s_ucpi[0] = ucpi;
ufs_read_cylinder (sb, cgno, 0);
if (unlikely(!ufs_read_cylinder (sb, cgno, 0))) {
UFSD("EXIT (FAILED)\n");
return NULL;
}
}
UFSD("EXIT\n");
return sbi->s_ucpi[0];