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-rw-r--r--fs/udf/truncate.c79
1 files changed, 63 insertions, 16 deletions
diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index 77975ae..60d2776 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -61,7 +61,11 @@ static void extent_trunc(struct inode * inode, struct extent_position *epos,
}
}
-void udf_discard_prealloc(struct inode * inode)
+/*
+ * Truncate the last extent to match i_size. This function assumes
+ * that preallocation extent is already truncated.
+ */
+void udf_truncate_tail_extent(struct inode *inode)
{
struct extent_position epos = { NULL, 0, {0, 0}};
kernel_lb_addr eloc;
@@ -71,7 +75,10 @@ void udf_discard_prealloc(struct inode * inode)
int adsize;
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
- inode->i_size == UDF_I_LENEXTENTS(inode))
+ inode->i_size == UDF_I_LENEXTENTS(inode))
+ return;
+ /* Are we going to delete the file anyway? */
+ if (inode->i_nlink == 0)
return;
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
@@ -79,36 +86,76 @@ void udf_discard_prealloc(struct inode * inode)
else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
adsize = sizeof(long_ad);
else
- adsize = 0;
-
- epos.block = UDF_I_LOCATION(inode);
+ BUG();
/* Find the last extent in the file */
while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1)
{
etype = netype;
lbcount += elen;
- if (lbcount > inode->i_size && lbcount - elen < inode->i_size)
- {
- WARN_ON(lbcount - inode->i_size >= inode->i_sb->s_blocksize);
+ if (lbcount > inode->i_size) {
+ if (lbcount - inode->i_size >= inode->i_sb->s_blocksize)
+ printk(KERN_WARNING
+ "udf_truncate_tail_extent(): Too long "
+ "extent after EOF in inode %u: i_size: "
+ "%Ld lbcount: %Ld extent %u+%u\n",
+ (unsigned)inode->i_ino,
+ (long long)inode->i_size,
+ (long long)lbcount,
+ (unsigned)eloc.logicalBlockNum,
+ (unsigned)elen);
nelen = elen - (lbcount - inode->i_size);
epos.offset -= adsize;
extent_trunc(inode, &epos, eloc, etype, elen, nelen);
epos.offset += adsize;
- lbcount = inode->i_size;
+ if (udf_next_aext(inode, &epos, &eloc, &elen, 1) != -1)
+ printk(KERN_ERR "udf_truncate_tail_extent(): "
+ "Extent after EOF in inode %u.\n",
+ (unsigned)inode->i_ino);
+ break;
}
}
+ /* This inode entry is in-memory only and thus we don't have to mark
+ * the inode dirty */
+ UDF_I_LENEXTENTS(inode) = inode->i_size;
+ brelse(epos.bh);
+}
+
+void udf_discard_prealloc(struct inode *inode)
+{
+ struct extent_position epos = { NULL, 0, {0, 0}};
+ kernel_lb_addr eloc;
+ uint32_t elen;
+ uint64_t lbcount = 0;
+ int8_t etype = -1, netype;
+ int adsize;
+
+ if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ||
+ inode->i_size == UDF_I_LENEXTENTS(inode))
+ return;
+
+ if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_SHORT)
+ adsize = sizeof(short_ad);
+ else if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_LONG)
+ adsize = sizeof(long_ad);
+ else
+ adsize = 0;
+
+ epos.block = UDF_I_LOCATION(inode);
+
+ /* Find the last extent in the file */
+ while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
+ etype = netype;
+ lbcount += elen;
+ }
if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
epos.offset -= adsize;
lbcount -= elen;
extent_trunc(inode, &epos, eloc, etype, elen, 0);
- if (!epos.bh)
- {
+ if (!epos.bh) {
UDF_I_LENALLOC(inode) = epos.offset - udf_file_entry_alloc_offset(inode);
mark_inode_dirty(inode);
- }
- else
- {
+ } else {
struct allocExtDesc *aed = (struct allocExtDesc *)(epos.bh->b_data);
aed->lengthAllocDescs = cpu_to_le32(epos.offset - sizeof(struct allocExtDesc));
if (!UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT) || UDF_SB_UDFREV(inode->i_sb) >= 0x0201)
@@ -118,9 +165,9 @@ void udf_discard_prealloc(struct inode * inode)
mark_buffer_dirty_inode(epos.bh, inode);
}
}
+ /* This inode entry is in-memory only and thus we don't have to mark
+ * the inode dirty */
UDF_I_LENEXTENTS(inode) = lbcount;
-
- WARN_ON(lbcount != inode->i_size);
brelse(epos.bh);
}
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