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Relax checking if the privider size matches size recorded in the

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superblock, allowing provider to be bit bigger, i.e. have some
extra padding after the FS image. That in some cases might be
a side-effect of using CLOOP format which enforces certain block
size and trying to compress image that is not exactly the number
of those blocks in size. The UFS itself does not have any issues
mounting such padded file systems, so it's what GEOM_LABEL should
do.

Submitted by:	@mizhka_gmail.com
Differential Revision:	https://reviews.freebsd.org/D6208
This commit is contained in:
Maxim Sobolev 2016-07-18 05:00:01 +00:00
parent 56d48d6dcb
commit 55f9588af4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=302985
1 changed files with 34 additions and 8 deletions
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42
sys/geom/label/g_label_ufs.c
View file

@ -45,6 +45,15 @@ __FBSDID("$FreeBSD$");
#define G_LABEL_UFS_VOLUME 0
#define G_LABEL_UFS_ID 1
/*
* G_LABEL_UFS_CMP returns true if difference between provider mediasize
* and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors
*/
#define G_LABEL_UFS_CMP(prov, fsys, size) \
( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \
< G_LABEL_UFS_MAXDIFF )
#define G_LABEL_UFS_MAXDIFF 0x100
static const int superblocks[] = SBLOCKSEARCH;
static void
@ -82,18 +91,35 @@ g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int wh
if (fs == NULL)
continue;
/*
* Check for magic. We also need to check if file system size is equal
* to providers size, because sysinstall(8) used to bogusly put first
* partition at offset 0 instead of 16, and glabel/ufs would find file
* system on slice instead of partition.
* Check for magic. We also need to check if file system size
* is almost equal to providers size, because sysinstall(8)
* used to bogusly put first partition at offset 0
* instead of 16, and glabel/ufs would find file system on slice
* instead of partition.
*
* In addition, media size can be a bit bigger than file system
* size. For instance, mkuzip can append bytes to align data
* to large sector size (it improves compression rates).
*/
switch (fs->fs_magic){
case FS_UFS1_MAGIC:
case FS_UFS2_MAGIC:
G_LABEL_DEBUG(1, "%s %s params: %jd, %d, %d, %jd\n",
fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2",
pp->name, pp->mediasize, fs->fs_fsize,
fs->fs_old_size, fs->fs_providersize);
break;
default:
break;
}
if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
((pp->mediasize / fs->fs_fsize == fs->fs_old_size) ||
(pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
( G_LABEL_UFS_CMP(pp, fs, fs_old_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS1. */
} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
((pp->mediasize / fs->fs_fsize == fs->fs_size) ||
(pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
( G_LABEL_UFS_CMP(pp, fs, fs_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS2. */
} else {
g_free(fs);