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authorDeepa Dinamani <deepa.kernel@gmail.com>2019-03-22 16:42:54 -0700
committerDeepa Dinamani <deepa.kernel@gmail.com>2019-08-30 07:27:18 -0700
commitc0da64f6bb674d20a8e84bcd30679c1483668fb2 (patch)
tree4b8b97bde36749aea9882b36cfbfb2bed22531dc
parentcb7a69e605908c34aad47644afeb26a765ade8d7 (diff)
fs: fat: Initialize filesystem timestamp ranges
Fill in the appropriate limits to avoid inconsistencies in the vfs cached inode times when timestamps are outside the permitted range. Some FAT variants indicate that the years after 2099 are not supported. Since commit 7decd1cb0305 ("fat: Fix and cleanup timestamp conversion") we support the full range of years that can be represented, up to 2107. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Acked-by: Jeff Layton <jlayton@kernel.org> Cc: hirofumi@mail.parknet.co.jp
-rw-r--r--fs/fat/inode.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 05689198f5af..5f04c5c810fb 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -31,6 +31,11 @@
#define KB_IN_SECTORS 2
+/* DOS dates from 1980/1/1 through 2107/12/31 */
+#define FAT_DATE_MIN (0<<9 | 1<<5 | 1)
+#define FAT_DATE_MAX (127<<9 | 12<<5 | 31)
+#define FAT_TIME_MAX (23<<11 | 59<<5 | 29)
+
/*
* A deserialized copy of the on-disk structure laid out in struct
* fat_boot_sector.
@@ -1605,6 +1610,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
int debug;
long error;
char buf[50];
+ struct timespec64 ts;
/*
* GFP_KERNEL is ok here, because while we do hold the
@@ -1698,6 +1704,12 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
sbi->free_clus_valid = 0;
sbi->prev_free = FAT_START_ENT;
sb->s_maxbytes = 0xffffffff;
+ fat_time_fat2unix(sbi, &ts, 0, cpu_to_le16(FAT_DATE_MIN), 0);
+ sb->s_time_min = ts.tv_sec;
+
+ fat_time_fat2unix(sbi, &ts, cpu_to_le16(FAT_TIME_MAX),
+ cpu_to_le16(FAT_DATE_MAX), 0);
+ sb->s_time_max = ts.tv_sec;
if (!sbi->fat_length && bpb.fat32_length) {
struct fat_boot_fsinfo *fsinfo;