From: Jiaying Zhang <jiayingz@xxxxxxxxxx>
fallocate() may potentially instantiate blocks past EOF, depending
on the flags used when it is called.
e2fsck currently has a test for blocks past i_size, and it
sometimes trips up - noticeably on xfstests 013 which runs fsstress.
This patch from Jiayang does fix it up for me - it (along with
e2fsprogs updates and other patches recently from Aneesh) has
survived many fsstress runs in a row.
The setattr interface may also be used to clear the flag and remove
any blocks past EOF.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
(just resending this since it probably got lost in the previous
thread - Jiaying didn't have a SOB line, but maybe that should
be added. I have included the proper From: line for authorship)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 874d169..4c7cd9b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -284,10 +284,11 @@ struct flex_groups {
#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
+#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF (bit reserved in fs.h) */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
-#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
-#define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
+#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
+#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
/* Flags that should be inherited by new inodes from their parent. */
#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 765a482..e7d5ba2 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3185,7 +3185,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
{
struct ext4_ext_path *path = NULL;
struct ext4_extent_header *eh;
- struct ext4_extent newex, *ex;
+ struct ext4_extent newex, *ex, *last_ex;
ext4_fsblk_t newblock;
int err = 0, depth, ret, cache_type;
unsigned int allocated = 0;
@@ -3366,6 +3366,14 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
EXT4_STATE_DIO_UNWRITTEN;;
}
}
+
+ if (unlikely(inode->i_flags & EXT4_EOFBLOCKS_FL)) {
+ BUG_ON(!eh->eh_entries);
+ last_ex = EXT_LAST_EXTENT(eh);
+ if (iblock + ar.len > le32_to_cpu(last_ex->ee_block)
+ + ext4_ext_get_actual_len(last_ex))
+ inode->i_flags &= ~EXT4_EOFBLOCKS_FL;
+ }
err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
if (err) {
/* free data blocks we just allocated */
@@ -3499,6 +3507,13 @@ static void ext4_falloc_update_inode(struct inode *inode,
i_size_write(inode, new_size);
if (new_size > EXT4_I(inode)->i_disksize)
ext4_update_i_disksize(inode, new_size);
+ } else {
+ /*
+ * Mark that we allocate beyond EOF so the subsequent truncate
+ * can proceed even if the new size is the same as i_size.
+ */
+ if (new_size > i_size_read(inode))
+ inode->i_flags |= EXT4_EOFBLOCKS_FL;
}
}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cbf56da..bc31ea6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4429,6 +4429,8 @@ void ext4_truncate(struct inode *inode)
if (!ext4_can_truncate(inode))
return;
+ inode->i_flags &= ~EXT4_EOFBLOCKS_FL;
+
if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
ei->i_state |= EXT4_STATE_DA_ALLOC_CLOSE;
@@ -4741,8 +4743,8 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei)
{
unsigned int flags = ei->vfs_inode.i_flags;
- ei->i_flags &= ~(EXT4_SYNC_FL|EXT4_APPEND_FL|
- EXT4_IMMUTABLE_FL|EXT4_NOATIME_FL|EXT4_DIRSYNC_FL);
+ ei->i_flags &= ~(EXT4_SYNC_FL|EXT4_APPEND_FL|EXT4_IMMUTABLE_FL|
+ EXT4_NOATIME_FL|EXT4_DIRSYNC_FL|EXT4_EOFBLOCKS_FL);
if (flags & S_SYNC)
ei->i_flags |= EXT4_SYNC_FL;
if (flags & S_APPEND)
@@ -4753,6 +4755,8 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei)
ei->i_flags |= EXT4_NOATIME_FL;
if (flags & S_DIRSYNC)
ei->i_flags |= EXT4_DIRSYNC_FL;
+ if (flags & FS_EOFBLOCKS_FL)
+ ei->i_flags |= EXT4_EOFBLOCKS_FL;
}
static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
@@ -5284,7 +5288,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
}
if (S_ISREG(inode->i_mode) &&
- attr->ia_valid & ATTR_SIZE && attr->ia_size < inode->i_size) {
+ attr->ia_valid & ATTR_SIZE &&
+ (attr->ia_size < inode->i_size ||
+ (inode->i_flags & EXT4_EOFBLOCKS_FL))) {
handle_t *handle;
handle = ext4_journal_start(inode, 3);
@@ -5315,6 +5321,11 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
goto err_out;
}
}
+ if ((inode->i_flags & EXT4_EOFBLOCKS_FL)) {
+ rc = vmtruncate(inode, attr->ia_size);
+ if (rc)
+ goto err_out;
+ }
}
rc = inode_setattr(inode, attr);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index b63d193..71f578e 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -92,6 +92,16 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
flags &= ~EXT4_EXTENTS_FL;
}
+ if (flags & EXT4_EOFBLOCKS_FL) {
+ /* we don't support adding EOFBLOCKS flag */
+ if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
+ err = -EOPNOTSUPP;
+ goto flags_out;
+ }
+ } else if (oldflags & EXT4_EOFBLOCKS_FL)
+ /* free the space reserved with fallocate KEEPSIZE */
+ vmtruncate(inode, inode->i_size);
+
handle = ext4_journal_start(inode, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 9147ca8..db3ffb6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -349,10 +349,11 @@ struct inodes_stat_t {
#define FS_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define FS_EXTENT_FL 0x00080000 /* Extents */
#define FS_DIRECTIO_FL 0x00100000 /* Use direct i/o */
+#define FS_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
#define FS_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
-#define FS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
-#define FS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
+#define FS_FL_USER_VISIBLE 0x0043DFFF /* User visible flags */
+#define FS_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
#define SYNC_FILE_RANGE_WAIT_BEFORE 1
--
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