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Date: Sun, 13 Nov 2016 17:33:11 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH 1/2] ext4: allow ext4_truncate() to return an error
This allows us to properly propagate errors back up to
ext4_truncate()'s callers. This also means we no longer have to
silently ignore some errors (e.g., when trying to add the inode to the
orphan inode list).
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/ext4.h | 2 +-
fs/ext4/inode.c | 41 ++++++++++++++++++++++++++---------------
fs/ext4/ioctl.c | 7 +++++--
fs/ext4/super.c | 6 ++++--
4 files changed, 36 insertions(+), 20 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 282a51b07c57..be2282dcde7d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2491,7 +2491,7 @@ extern int ext4_change_inode_journal_flag(struct inode *, int);
extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
extern int ext4_inode_attach_jinode(struct inode *inode);
extern int ext4_can_truncate(struct inode *inode);
-extern void ext4_truncate(struct inode *);
+extern int ext4_truncate(struct inode *);
extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
extern void ext4_set_inode_flags(struct inode *);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9c064727ed62..40ea090d2e0e 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -261,8 +261,15 @@ void ext4_evict_inode(struct inode *inode)
"couldn't mark inode dirty (err %d)", err);
goto stop_handle;
}
- if (inode->i_blocks)
- ext4_truncate(inode);
+ if (inode->i_blocks) {
+ err = ext4_truncate(inode);
+ if (err) {
+ ext4_error(inode->i_sb,
+ "couldn't truncate inode %lu (err %d)",
+ inode->i_ino, err);
+ goto stop_handle;
+ }
+ }
/*
* ext4_ext_truncate() doesn't reserve any slop when it
@@ -4091,10 +4098,11 @@ int ext4_inode_attach_jinode(struct inode *inode)
* that's fine - as long as they are linked from the inode, the post-crash
* ext4_truncate() run will find them and release them.
*/
-void ext4_truncate(struct inode *inode)
+int ext4_truncate(struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
unsigned int credits;
+ int err = 0;
handle_t *handle;
struct address_space *mapping = inode->i_mapping;
@@ -4108,7 +4116,7 @@ void ext4_truncate(struct inode *inode)
trace_ext4_truncate_enter(inode);
if (!ext4_can_truncate(inode))
- return;
+ return 0;
ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS);
@@ -4120,13 +4128,13 @@ void ext4_truncate(struct inode *inode)
ext4_inline_data_truncate(inode, &has_inline);
if (has_inline)
- return;
+ return 0;
}
/* If we zero-out tail of the page, we have to create jinode for jbd2 */
if (inode->i_size & (inode->i_sb->s_blocksize - 1)) {
if (ext4_inode_attach_jinode(inode) < 0)
- return;
+ return 0;
}
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
@@ -4135,10 +4143,8 @@ void ext4_truncate(struct inode *inode)
credits = ext4_blocks_for_truncate(inode);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits);
- if (IS_ERR(handle)) {
- ext4_std_error(inode->i_sb, PTR_ERR(handle));
- return;
- }
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
if (inode->i_size & (inode->i_sb->s_blocksize - 1))
ext4_block_truncate_page(handle, mapping, inode->i_size);
@@ -4152,7 +4158,8 @@ void ext4_truncate(struct inode *inode)
* Implication: the file must always be in a sane, consistent
* truncatable state while each transaction commits.
*/
- if (ext4_orphan_add(handle, inode))
+ err = ext4_orphan_add(handle, inode);
+ if (err)
goto out_stop;
down_write(&EXT4_I(inode)->i_data_sem);
@@ -4185,6 +4192,7 @@ void ext4_truncate(struct inode *inode)
ext4_journal_stop(handle);
trace_ext4_truncate_exit(inode);
+ return err;
}
/*
@@ -5199,12 +5207,15 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
* in data=journal mode to make pages freeable.
*/
truncate_pagecache(inode, inode->i_size);
- if (shrink)
- ext4_truncate(inode);
+ if (shrink) {
+ rc = ext4_truncate(inode);
+ if (rc)
+ error = rc;
+ }
up_write(&EXT4_I(inode)->i_mmap_sem);
}
- if (!rc) {
+ if (!error) {
setattr_copy(inode, attr);
mark_inode_dirty(inode);
}
@@ -5216,7 +5227,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
if (orphan && inode->i_nlink)
ext4_orphan_del(NULL, inode);
- if (!rc && (ia_valid & ATTR_MODE))
+ if (!error && (ia_valid & ATTR_MODE))
rc = posix_acl_chmod(inode, inode->i_mode);
err_out:
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index bf5ae8ebbc97..99862a3726fc 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -248,8 +248,11 @@ static int ext4_ioctl_setflags(struct inode *inode,
err = -EOPNOTSUPP;
goto flags_out;
}
- } else if (oldflags & EXT4_EOFBLOCKS_FL)
- ext4_truncate(inode);
+ } else if (oldflags & EXT4_EOFBLOCKS_FL) {
+ err = ext4_truncate(inode);
+ if (err)
+ goto flags_out;
+ }
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
if (IS_ERR(handle)) {
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 20da99da0a34..e4f61c39328a 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2330,7 +2330,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
struct ext4_super_block *es)
{
unsigned int s_flags = sb->s_flags;
- int nr_orphans = 0, nr_truncates = 0;
+ int ret, nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
int i;
#endif
@@ -2412,7 +2412,9 @@ static void ext4_orphan_cleanup(struct super_block *sb,
inode->i_ino, inode->i_size);
inode_lock(inode);
truncate_inode_pages(inode->i_mapping, inode->i_size);
- ext4_truncate(inode);
+ ret = ext4_truncate(inode);
+ if (ret)
+ ext4_std_error(inode->i_sb, ret);
inode_unlock(inode);
nr_truncates++;
} else {
--
2.11.0.rc0.7.gbe5a750
--
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