5.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: yangerkun yangerkun@huawei.com
commit aa507b5faf38784defe49f5e64605ac3c4425e26 upstream.
While do swap between two inode, they swap i_data without update quota information. Also, swap_inode_boot_loader can do "revert" somtimes, so update the quota while all operations has been finished.
Signed-off-by: yangerkun yangerkun@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/ext4/ioctl.c | 56 +++++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 43 insertions(+), 13 deletions(-)
--- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -68,8 +68,6 @@ static void swap_inode_data(struct inode ei2 = EXT4_I(inode2);
swap(inode1->i_version, inode2->i_version); - swap(inode1->i_blocks, inode2->i_blocks); - swap(inode1->i_bytes, inode2->i_bytes); swap(inode1->i_atime, inode2->i_atime); swap(inode1->i_mtime, inode2->i_mtime);
@@ -115,6 +113,9 @@ static long swap_inode_boot_loader(struc int err; struct inode *inode_bl; struct ext4_inode_info *ei_bl; + qsize_t size, size_bl, diff; + blkcnt_t blocks; + unsigned short bytes;
inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL); if (IS_ERR(inode_bl)) @@ -180,6 +181,13 @@ static long swap_inode_boot_loader(struc memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); }
+ err = dquot_initialize(inode); + if (err) + goto err_out1; + + size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes; + size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes; + diff = size - size_bl; swap_inode_data(inode, inode_bl);
inode->i_ctime = inode_bl->i_ctime = current_time(inode); @@ -193,24 +201,46 @@ static long swap_inode_boot_loader(struc
err = ext4_mark_inode_dirty(handle, inode); if (err < 0) { + /* No need to update quota information. */ ext4_warning(inode->i_sb, "couldn't mark inode #%lu dirty (err %d)", inode->i_ino, err); /* Revert all changes: */ swap_inode_data(inode, inode_bl); ext4_mark_inode_dirty(handle, inode); - } else { - err = ext4_mark_inode_dirty(handle, inode_bl); - if (err < 0) { - ext4_warning(inode_bl->i_sb, - "couldn't mark inode #%lu dirty (err %d)", - inode_bl->i_ino, err); - /* Revert all changes: */ - swap_inode_data(inode, inode_bl); - ext4_mark_inode_dirty(handle, inode); - ext4_mark_inode_dirty(handle, inode_bl); - } + goto err_out1; + } + + blocks = inode_bl->i_blocks; + bytes = inode_bl->i_bytes; + inode_bl->i_blocks = inode->i_blocks; + inode_bl->i_bytes = inode->i_bytes; + err = ext4_mark_inode_dirty(handle, inode_bl); + if (err < 0) { + /* No need to update quota information. */ + ext4_warning(inode_bl->i_sb, + "couldn't mark inode #%lu dirty (err %d)", + inode_bl->i_ino, err); + goto revert; + } + + /* Bootloader inode should not be counted into quota information. */ + if (diff > 0) + dquot_free_space(inode, diff); + else + err = dquot_alloc_space(inode, -1 * diff); + + if (err < 0) { +revert: + /* Revert all changes: */ + inode_bl->i_blocks = blocks; + inode_bl->i_bytes = bytes; + swap_inode_data(inode, inode_bl); + ext4_mark_inode_dirty(handle, inode); + ext4_mark_inode_dirty(handle, inode_bl); } + +err_out1: ext4_journal_stop(handle); ext4_double_up_write_data_sem(inode, inode_bl);