Signed-off-by: Alexander Kuleshov <[email protected]>
---
fs/fat/fatent.c | 8 ++++----
include/uapi/linux/msdos_fs.h | 3 +++
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 260705c..3def7bd 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -129,7 +129,7 @@ static int fat12_ent_get(struct fat_entry *fatent)
next = (*ent12_p[1] << 8) | *ent12_p[0];
spin_unlock(&fat12_entry_lock);
- next &= 0x0fff;
+ next &= EOF_FAT12;
if (next >= BAD_FAT12)
next = FAT_ENT_EOF;
return next;
@@ -146,7 +146,7 @@ static int fat16_ent_get(struct fat_entry *fatent)
static int fat32_ent_get(struct fat_entry *fatent)
{
- int next = le32_to_cpu(*fatent->u.ent32_p) & 0x0fffffff;
+ int next = le32_to_cpu(*fatent->u.ent32_p) & EOF_FAT32;
WARN_ON((unsigned long)fatent->u.ent32_p & (4 - 1));
if (next >= BAD_FAT32)
next = FAT_ENT_EOF;
@@ -186,8 +186,8 @@ static void fat16_ent_put(struct fat_entry *fatent, int new)
static void fat32_ent_put(struct fat_entry *fatent, int new)
{
- WARN_ON(new & 0xf0000000);
- new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
+ WARN_ON(new & FAT_FREE_CLUSTER);
+ new |= le32_to_cpu(*fatent->u.ent32_p) & ~EOF_FAT32;
*fatent->u.ent32_p = cpu_to_le32(new);
mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
}
diff --git a/include/uapi/linux/msdos_fs.h b/include/uapi/linux/msdos_fs.h
index e956704..6d085bf 100644
--- a/include/uapi/linux/msdos_fs.h
+++ b/include/uapi/linux/msdos_fs.h
@@ -58,6 +58,9 @@
#define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))
+/* indicates that a cluster is free */
+#define FAT_FREE_CLUSTER 0xf0000000
+
/* start of data cluster's entry (number of reserved clusters) */
#define FAT_START_ENT 2
--
2.3.0.80.g18d0fec
--
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