aboutsummaryrefslogtreecommitdiffstats
path: root/fs/ext4/namei.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c94
1 files changed, 65 insertions, 29 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 161099f39ab9..9a138a6dc17e 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1308,8 +1308,8 @@ int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
ext4_match(fname, de)) {
/* found a match - just to be sure, do
* a full check */
- if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data,
- bh->b_size, offset))
+ if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf,
+ buf_size, offset))
return -1;
*res_dir = de;
return 1;
@@ -1741,7 +1741,7 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
blocksize, hinfo, map);
map -= count;
dx_sort_map(map, count);
- /* Split the existing block in the middle, size-wise */
+ /* Ensure that neither split block is over half full */
size = 0;
move = 0;
for (i = count-1; i >= 0; i--) {
@@ -1751,8 +1751,18 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
size += map[i].size;
move++;
}
- /* map index at which we will split */
- split = count - move;
+ /*
+ * map index at which we will split
+ *
+ * If the sum of active entries didn't exceed half the block size, just
+ * split it in half by count; each resulting block will have at least
+ * half the space free.
+ */
+ if (i > 0)
+ split = count - move;
+ else
+ split = count/2;
+
hash2 = map[split].hash;
continued = hash2 == map[split - 1].hash;
dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
@@ -2283,11 +2293,10 @@ again:
(frame - 1)->bh);
if (err)
goto journal_error;
- if (restart) {
- err = ext4_handle_dirty_dx_node(handle, dir,
- frame->bh);
+ err = ext4_handle_dirty_dx_node(handle, dir,
+ frame->bh);
+ if (restart || err)
goto journal_error;
- }
} else {
struct dx_root *dxroot;
memcpy((char *) entries2, (char *) entries,
@@ -2353,7 +2362,7 @@ int ext4_generic_delete_entry(handle_t *handle,
de = (struct ext4_dir_entry_2 *)entry_buf;
while (i < buf_size - csum_size) {
if (ext4_check_dir_entry(dir, NULL, de, bh,
- bh->b_data, bh->b_size, i))
+ entry_buf, buf_size, i))
return -EFSCORRUPTED;
if (de == de_del) {
if (pde)
@@ -3270,7 +3279,7 @@ static int ext4_link(struct dentry *old_dentry,
return -EMLINK;
if (ext4_encrypted_inode(dir) &&
!fscrypt_has_permitted_context(dir, inode))
- return -EPERM;
+ return -EXDEV;
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
(!projid_eq(EXT4_I(dir)->i_projid,
@@ -3432,12 +3441,35 @@ static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
return retval;
}
}
- brelse(ent->bh);
- ent->bh = NULL;
return 0;
}
+static void ext4_resetent(handle_t *handle, struct ext4_renament *ent,
+ unsigned ino, unsigned file_type)
+{
+ struct ext4_renament old = *ent;
+ int retval = 0;
+
+ /*
+ * old->de could have moved from under us during make indexed dir,
+ * so the old->de may no longer valid and need to find it again
+ * before reset old inode info.
+ */
+ old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
+ if (IS_ERR(old.bh))
+ retval = PTR_ERR(old.bh);
+ if (!old.bh)
+ retval = -ENOENT;
+ if (retval) {
+ ext4_std_error(old.dir->i_sb, retval);
+ return;
+ }
+
+ ext4_setent(handle, &old, ino, file_type);
+ brelse(old.bh);
+}
+
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
const struct qstr *d_name)
{
@@ -3603,13 +3635,13 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
retval = -ENOENT;
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
- goto end_rename;
+ goto release_bh;
if ((old.dir != new.dir) &&
ext4_encrypted_inode(new.dir) &&
!fscrypt_has_permitted_context(new.dir, old.inode)) {
- retval = -EPERM;
- goto end_rename;
+ retval = -EXDEV;
+ goto release_bh;
}
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
@@ -3617,7 +3649,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
if (IS_ERR(new.bh)) {
retval = PTR_ERR(new.bh);
new.bh = NULL;
- goto end_rename;
+ goto release_bh;
}
if (new.bh) {
if (!new.inode) {
@@ -3634,18 +3666,17 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
if (IS_ERR(handle)) {
retval = PTR_ERR(handle);
- handle = NULL;
- goto end_rename;
+ goto release_bh;
}
} else {
whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
if (IS_ERR(whiteout)) {
retval = PTR_ERR(whiteout);
- whiteout = NULL;
- goto end_rename;
+ goto release_bh;
}
}
+ old_file_type = old.de->file_type;
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
ext4_handle_sync(handle);
@@ -3673,7 +3704,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
force_reread = (new.dir->i_ino == old.dir->i_ino &&
ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
- old_file_type = old.de->file_type;
if (whiteout) {
/*
* Do this before adding a new entry, so the old entry is sure
@@ -3745,17 +3775,23 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
retval = 0;
end_rename:
- brelse(old.dir_bh);
- brelse(old.bh);
- brelse(new.bh);
if (whiteout) {
- if (retval)
+ if (retval) {
+ ext4_resetent(handle, &old,
+ old.inode->i_ino, old_file_type);
drop_nlink(whiteout);
+ ext4_orphan_add(handle, whiteout);
+ }
unlock_new_inode(whiteout);
+ ext4_journal_stop(handle);
iput(whiteout);
- }
- if (handle)
+ } else {
ext4_journal_stop(handle);
+ }
+release_bh:
+ brelse(old.dir_bh);
+ brelse(old.bh);
+ brelse(new.bh);
return retval;
}
@@ -3788,7 +3824,7 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
(old_dir != new_dir) &&
(!fscrypt_has_permitted_context(new_dir, old.inode) ||
!fscrypt_has_permitted_context(old_dir, new.inode)))
- return -EPERM;
+ return -EXDEV;
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
!projid_eq(EXT4_I(new_dir)->i_projid,
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-04-30 15:29:06 +0000