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-rw-r--r--fs/ext4/extents.c80
1 files changed, 46 insertions, 34 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 0b16fb4c06d3..57794a7a435c 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2621,27 +2621,6 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
ex_ee_block = le32_to_cpu(ex->ee_block);
ex_ee_len = ext4_ext_get_actual_len(ex);
- /*
- * If we're starting with an extent other than the last one in the
- * node, we need to see if it shares a cluster with the extent to
- * the right (towards the end of the file). If its leftmost cluster
- * is this extent's rightmost cluster and it is not cluster aligned,
- * we'll mark it as a partial that is not to be deallocated.
- */
-
- if (ex != EXT_LAST_EXTENT(eh)) {
- ext4_fsblk_t current_pblk, right_pblk;
- long long current_cluster, right_cluster;
-
- current_pblk = ext4_ext_pblock(ex) + ex_ee_len - 1;
- current_cluster = (long long)EXT4_B2C(sbi, current_pblk);
- right_pblk = ext4_ext_pblock(ex + 1);
- right_cluster = (long long)EXT4_B2C(sbi, right_pblk);
- if (current_cluster == right_cluster &&
- EXT4_PBLK_COFF(sbi, right_pblk))
- *partial_cluster = -right_cluster;
- }
-
trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster);
while (ex >= EXT_FIRST_EXTENT(eh) &&
@@ -2666,14 +2645,16 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
if (end < ex_ee_block) {
/*
* We're going to skip this extent and move to another,
- * so if this extent is not cluster aligned we have
- * to mark the current cluster as used to avoid
- * accidentally freeing it later on
+ * so note that its first cluster is in use to avoid
+ * freeing it when removing blocks. Eventually, the
+ * right edge of the truncated/punched region will
+ * be just to the left.
*/
- pblk = ext4_ext_pblock(ex);
- if (EXT4_PBLK_COFF(sbi, pblk))
+ if (sbi->s_cluster_ratio > 1) {
+ pblk = ext4_ext_pblock(ex);
*partial_cluster =
- -((long long)EXT4_B2C(sbi, pblk));
+ -(long long) EXT4_B2C(sbi, pblk);
+ }
ex--;
ex_ee_block = le32_to_cpu(ex->ee_block);
ex_ee_len = ext4_ext_get_actual_len(ex);
@@ -2819,7 +2800,7 @@ ext4_ext_more_to_rm(struct ext4_ext_path *path)
int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
ext4_lblk_t end)
{
- struct super_block *sb = inode->i_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
int depth = ext_depth(inode);
struct ext4_ext_path *path = NULL;
long long partial_cluster = 0;
@@ -2845,9 +2826,10 @@ again:
*/
if (end < EXT_MAX_BLOCKS - 1) {
struct ext4_extent *ex;
- ext4_lblk_t ee_block;
+ ext4_lblk_t ee_block, ex_end, lblk;
+ ext4_fsblk_t pblk;
- /* find extent for this block */
+ /* find extent for or closest extent to this block */
path = ext4_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
if (IS_ERR(path)) {
ext4_journal_stop(handle);
@@ -2867,6 +2849,7 @@ again:
}
ee_block = le32_to_cpu(ex->ee_block);
+ ex_end = ee_block + ext4_ext_get_actual_len(ex) - 1;
/*
* See if the last block is inside the extent, if so split
@@ -2874,8 +2857,19 @@ again:
* tail of the first part of the split extent in
* ext4_ext_rm_leaf().
*/
- if (end >= ee_block &&
- end < ee_block + ext4_ext_get_actual_len(ex) - 1) {
+ if (end >= ee_block && end < ex_end) {
+
+ /*
+ * If we're going to split the extent, note that
+ * the cluster containing the block after 'end' is
+ * in use to avoid freeing it when removing blocks.
+ */
+ if (sbi->s_cluster_ratio > 1) {
+ pblk = ext4_ext_pblock(ex) + end - ee_block + 2;
+ partial_cluster =
+ -(long long) EXT4_B2C(sbi, pblk);
+ }
+
/*
* Split the extent in two so that 'end' is the last
* block in the first new extent. Also we should not
@@ -2886,6 +2880,24 @@ again:
end + 1, 1);
if (err < 0)
goto out;
+
+ } else if (sbi->s_cluster_ratio > 1 && end >= ex_end) {
+ /*
+ * If there's an extent to the right its first cluster
+ * contains the immediate right boundary of the
+ * truncated/punched region. Set partial_cluster to
+ * its negative value so it won't be freed if shared
+ * with the current extent. The end < ee_block case
+ * is handled in ext4_ext_rm_leaf().
+ */
+ lblk = ex_end + 1;
+ err = ext4_ext_search_right(inode, path, &lblk, &pblk,
+ &ex);
+ if (err)
+ goto out;
+ if (pblk)
+ partial_cluster =
+ -(long long) EXT4_B2C(sbi, pblk);
}
}
/*
@@ -3003,8 +3015,8 @@ again:
int flags = get_default_free_blocks_flags(inode);
ext4_free_blocks(handle, inode, NULL,
- EXT4_C2B(EXT4_SB(sb), partial_cluster),
- EXT4_SB(sb)->s_cluster_ratio, flags);
+ EXT4_C2B(sbi, partial_cluster),
+ sbi->s_cluster_ratio, flags);
partial_cluster = 0;
}