On Wed 31-05-17 01:15:17, Tahsin Erdogan wrote:
> Ext4 ea_inode feature allows storing xattr values in external inodes to
> be able to store values that are bigger than a block in size. Ext4 also
> has deduplication support for these type of inodes. With deduplication,
> the actual storage waste is eliminated but the users of such inodes are
> still charged full quota for the inodes as if there was no sharing
> happening in the background.
>
> This design requires ext4 to manually charge the users because the
> inodes are shared.
>
> An implication of this is that, if someone calls chown on a file that
> has such references we need to transfer the quota for the file and xattr
> inodes. Current dquot_transfer() function implicitly transfers one inode
> charge. In our case, we would like to specify additional inodes to be
> transferred.
Hum, rather handle this similarly to how we handle delalloc reserved space.
Add a callback to dq_ops to get "inode usage" of an inode and then use it
in dquot_transfer(), dquot_free_inode(), dquot_alloc_inode().
Honza
> Signed-off-by: Tahsin Erdogan <tahsin@xxxxxxxxxx>
> ---
> fs/ext2/inode.c | 2 +-
> fs/ext4/inode.c | 8 ++++++-
> fs/ext4/ioctl.c | 13 +++++++++++-
> fs/ext4/xattr.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
> fs/ext4/xattr.h | 2 ++
> fs/jfs/file.c | 2 +-
> fs/ocfs2/file.c | 2 +-
> fs/quota/dquot.c | 16 +++++++-------
> fs/reiserfs/inode.c | 2 +-
> include/linux/quotaops.h | 8 ++++---
> 10 files changed, 93 insertions(+), 16 deletions(-)
>
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 2dcbd5698884..a13ba5dcb355 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -1656,7 +1656,7 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
> }
> if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
> (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
> - error = dquot_transfer(inode, iattr);
> + error = dquot_transfer(inode, iattr, 0);
> if (error)
> return error;
> }
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 6f5872197d6c..28abbbdbbb80 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -5267,6 +5267,7 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
> int error, rc = 0;
> int orphan = 0;
> const unsigned int ia_valid = attr->ia_valid;
> + int ea_inode_refs;
>
> if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
> return -EIO;
> @@ -5293,7 +5294,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
> error = PTR_ERR(handle);
> goto err_out;
> }
> - error = dquot_transfer(inode, attr);
> +
> + down_read(&EXT4_I(inode)->xattr_sem);
> + error = ea_inode_refs = ext4_xattr_inode_count(inode);
> + if (ea_inode_refs >= 0)
> + error = dquot_transfer(inode, attr, ea_inode_refs);
> + up_read(&EXT4_I(inode)->xattr_sem);
> if (error) {
> ext4_journal_stop(handle);
> return error;
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index dde8deb11e59..9938dc8e24c8 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -21,6 +21,7 @@
> #include "ext4.h"
> #include <linux/fsmap.h>
> #include "fsmap.h"
> +#include "xattr.h"
> #include <trace/events/ext4.h>
>
> /**
> @@ -319,6 +320,7 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
> struct ext4_iloc iloc;
> struct ext4_inode *raw_inode;
> struct dquot *transfer_to[MAXQUOTAS] = { };
> + int ea_inode_refs;
>
> if (!ext4_has_feature_project(sb)) {
> if (projid != EXT4_DEF_PROJID)
> @@ -371,9 +373,17 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
> if (err)
> goto out_stop;
>
> + down_read(&EXT4_I(inode)->xattr_sem);
> + ea_inode_refs = ext4_xattr_inode_count(inode);
> + if (ea_inode_refs < 0) {
> + up_read(&EXT4_I(inode)->xattr_sem);
> + err = ea_inode_refs;
> + goto out_stop;
> + }
> +
> transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
> if (!IS_ERR(transfer_to[PRJQUOTA])) {
> - err = __dquot_transfer(inode, transfer_to);
> + err = __dquot_transfer(inode, transfer_to, ea_inode_refs);
> dqput(transfer_to[PRJQUOTA]);
> if (err)
> goto out_dirty;
> @@ -382,6 +392,7 @@ static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
> EXT4_I(inode)->i_projid = kprojid;
> inode->i_ctime = current_time(inode);
> out_dirty:
> + up_read(&EXT4_I(inode)->xattr_sem);
> rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
> if (!err)
> err = rc;
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index caddc176a612..1d6fcbb01517 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -701,6 +701,60 @@ static void ext4_xattr_update_super_block(handle_t *handle,
> }
> }
>
> +int ext4_xattr_inode_count(struct inode *inode)
> +{
> + struct ext4_iloc iloc = { .bh = NULL };
> + struct buffer_head *bh = NULL;
> + struct ext4_inode *raw_inode;
> + struct ext4_xattr_ibody_header *header;
> + struct ext4_xattr_entry *entry;
> + int inode_count = 0;
> + void *end;
> + int ret;
> +
> + lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem);
> +
> + if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
> + ret = ext4_get_inode_loc(inode, &iloc);
> + if (ret)
> + goto out;
> + raw_inode = ext4_raw_inode(&iloc);
> + header = IHDR(inode, raw_inode);
> + end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
> + ret = xattr_check_inode(inode, header, end);
> + if (ret)
> + goto out;
> +
> + for (entry = IFIRST(header); !IS_LAST_ENTRY(entry);
> + entry = EXT4_XATTR_NEXT(entry))
> + if (entry->e_value_inum)
> + inode_count++;
> + }
> +
> + if (EXT4_I(inode)->i_file_acl) {
> + bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl);
> + if (!bh) {
> + ret = -EIO;
> + goto out;
> + }
> +
> + if (ext4_xattr_check_block(inode, bh)) {
> + ret = -EFSCORRUPTED;
> + goto out;
> + }
> +
> + for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
> + entry = EXT4_XATTR_NEXT(entry))
> + if (entry->e_value_inum)
> + inode_count++;
> + }
> + ret = inode_count;
> +out:
> + brelse(iloc.bh);
> + brelse(bh);
> + return ret;
> +}
> +
> static inline size_t round_up_cluster(struct inode *inode, size_t length)
> {
> struct super_block *sb = inode->i_sb;
> diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
> index 67616cb9a059..8ef6fe123255 100644
> --- a/fs/ext4/xattr.h
> +++ b/fs/ext4/xattr.h
> @@ -193,3 +193,5 @@ extern void ext4_xattr_inode_set_class(struct inode *ea_inode);
> #else
> static inline void ext4_xattr_inode_set_class(struct inode *ea_inode) { }
> #endif
> +
> +int ext4_xattr_inode_count(struct inode *inode);
> diff --git a/fs/jfs/file.c b/fs/jfs/file.c
> index 739492c7a3fd..b08e0b0449a7 100644
> --- a/fs/jfs/file.c
> +++ b/fs/jfs/file.c
> @@ -114,7 +114,7 @@ int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
> }
> if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
> (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
> - rc = dquot_transfer(inode, iattr);
> + rc = dquot_transfer(inode, iattr, 0);
> if (rc)
> return rc;
> }
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index bfeb647459d9..d3cbf6467af6 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -1259,7 +1259,7 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
> mlog_errno(status);
> goto bail_unlock;
> }
> - status = __dquot_transfer(inode, transfer_to);
> + status = __dquot_transfer(inode, transfer_to, 0);
> if (status < 0)
> goto bail_commit;
> } else {
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index 48813aeaab80..16e13d554aaa 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -1906,10 +1906,12 @@ EXPORT_SYMBOL(dquot_free_inode);
> * We are holding reference on transfer_from & transfer_to, no need to
> * protect them by srcu_read_lock().
> */
> -int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
> +int __dquot_transfer(struct inode *inode, struct dquot **transfer_to,
> + int inodes_extra)
> {
> qsize_t space, cur_space;
> qsize_t rsv_space = 0;
> + qsize_t inode_count = 1 + inodes_extra;
> struct dquot *transfer_from[MAXQUOTAS] = {};
> int cnt, ret = 0;
> char is_valid[MAXQUOTAS] = {};
> @@ -1946,7 +1948,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
> continue;
> is_valid[cnt] = 1;
> transfer_from[cnt] = i_dquot(inode)[cnt];
> - ret = check_idq(transfer_to[cnt], 1, &warn_to[cnt]);
> + ret = check_idq(transfer_to[cnt], inode_count, &warn_to[cnt]);
> if (ret)
> goto over_quota;
> ret = check_bdq(transfer_to[cnt], space, 0, &warn_to[cnt]);
> @@ -1963,7 +1965,7 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
> /* Due to IO error we might not have transfer_from[] structure */
> if (transfer_from[cnt]) {
> int wtype;
> - wtype = info_idq_free(transfer_from[cnt], 1);
> + wtype = info_idq_free(transfer_from[cnt], inode_count);
> if (wtype != QUOTA_NL_NOWARN)
> prepare_warning(&warn_from_inodes[cnt],
> transfer_from[cnt], wtype);
> @@ -1971,13 +1973,13 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
> if (wtype != QUOTA_NL_NOWARN)
> prepare_warning(&warn_from_space[cnt],
> transfer_from[cnt], wtype);
> - dquot_decr_inodes(transfer_from[cnt], 1);
> + dquot_decr_inodes(transfer_from[cnt], inode_count);
> dquot_decr_space(transfer_from[cnt], cur_space);
> dquot_free_reserved_space(transfer_from[cnt],
> rsv_space);
> }
>
> - dquot_incr_inodes(transfer_to[cnt], 1);
> + dquot_incr_inodes(transfer_to[cnt], inode_count);
> dquot_incr_space(transfer_to[cnt], cur_space);
> dquot_resv_space(transfer_to[cnt], rsv_space);
>
> @@ -2005,7 +2007,7 @@ EXPORT_SYMBOL(__dquot_transfer);
> /* Wrapper for transferring ownership of an inode for uid/gid only
> * Called from FSXXX_setattr()
> */
> -int dquot_transfer(struct inode *inode, struct iattr *iattr)
> +int dquot_transfer(struct inode *inode, struct iattr *iattr, int inodes_extra)
> {
> struct dquot *transfer_to[MAXQUOTAS] = {};
> struct dquot *dquot;
> @@ -2037,7 +2039,7 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
> }
> transfer_to[GRPQUOTA] = dquot;
> }
> - ret = __dquot_transfer(inode, transfer_to);
> + ret = __dquot_transfer(inode, transfer_to, inodes_extra);
> out_put:
> dqput_all(transfer_to);
> return ret;
> diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
> index 873fc04e9403..51586051b5dd 100644
> --- a/fs/reiserfs/inode.c
> +++ b/fs/reiserfs/inode.c
> @@ -3370,7 +3370,7 @@ int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
> reiserfs_write_unlock(inode->i_sb);
> if (error)
> goto out;
> - error = dquot_transfer(inode, attr);
> + error = dquot_transfer(inode, attr, 0);
> reiserfs_write_lock(inode->i_sb);
> if (error) {
> journal_end(&th);
> diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
> index dda22f45fc1b..b7bcd9c6db6c 100644
> --- a/include/linux/quotaops.h
> +++ b/include/linux/quotaops.h
> @@ -106,8 +106,9 @@ int dquot_get_next_dqblk(struct super_block *sb, struct kqid *id,
> int dquot_set_dqblk(struct super_block *sb, struct kqid id,
> struct qc_dqblk *di);
>
> -int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
> -int dquot_transfer(struct inode *inode, struct iattr *iattr);
> +int __dquot_transfer(struct inode *inode, struct dquot **transfer_to,
> + int inodes_extra);
> +int dquot_transfer(struct inode *inode, struct iattr *iattr, int inodes_extra);
>
> static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
> {
> @@ -226,7 +227,8 @@ static inline void dquot_free_inode(struct inode *inode)
> {
> }
>
> -static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
> +static inline int dquot_transfer(struct inode *inode, struct iattr *iattr,
> + int inodes_extra)
> {
> return 0;
> }
> --
> 2.13.0.219.gdb65acc882-goog
>
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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