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udf: Don't modify filesystem for read-only mounts

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When read-write mount of a filesystem is requested but we find out we
can mount the filesystem only in read-only mode, we still modify
LVID in udf_close_lvid(). That is both unnecessary and contrary to
expectation that when we fall back to read-only mount we don't modify
the filesystem.

Make sure we call udf_close_lvid() only if we called udf_open_lvid() so
that filesystem gets modified only if we verified we are allowed to
write to it.

Reported-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Jan Kara <jack@suse.com>
This commit is contained in:
Jan Kara 2015-08-20 14:50:07 +02:00
parent 72d4d0e489
commit 9181f8bf5a
1 changed files with 5 additions and 2 deletions
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7
fs/udf/super.c
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@ -2070,6 +2070,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
struct udf_options uopt;
struct kernel_lb_addr rootdir, fileset;
struct udf_sb_info *sbi;
bool lvid_open = false;
uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
uopt.uid = INVALID_UID;
@ -2216,8 +2217,10 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
le16_to_cpu(ts.year), ts.month, ts.day,
ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
}
if (!(sb->s_flags & MS_RDONLY))
if (!(sb->s_flags & MS_RDONLY)) {
udf_open_lvid(sb);
lvid_open = true;
}
/* Assign the root inode */
/* assign inodes by physical block number */
@ -2248,7 +2251,7 @@ parse_options_failure:
if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
unload_nls(sbi->s_nls_map);
#endif
if (!(sb->s_flags & MS_RDONLY))
if (lvid_open)
udf_close_lvid(sb);
brelse(sbi->s_lvid_bh);
udf_sb_free_partitions(sb);