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Subject[PATCH RFC 4/6] ext4: add project id support
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This patch adds a new internal field of ext4 inode to save project identifier.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
---
fs/ext4/ext4.h | 13 ++++++++++-
fs/ext4/ialloc.c | 6 +++++
fs/ext4/inode.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4/namei.c | 14 ++++++++++++
fs/ext4/super.c | 2 ++
5 files changed, 99 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index a75fba6..a3fdbb5 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -683,6 +683,7 @@ struct ext4_inode {
__le32 i_crtime; /* File Creation time */
__le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
__le32 i_version_hi; /* high 32 bits for 64-bit version */
+ __le32 i_projid; /* Project ID */
};

struct move_extent {
@@ -938,6 +939,7 @@ struct ext4_inode_info {

/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
__u32 i_csum_seed;
+ kprojid_t i_projid;
};

/*
@@ -1522,6 +1524,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
* GDT_CSUM bits are mutually exclusive.
*/
#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
+#define EXT4_FEATURE_RO_COMPAT_PROJECT 0x1000 /* Project ID */

#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
@@ -1571,7 +1574,8 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
- EXT4_FEATURE_RO_COMPAT_QUOTA)
+ EXT4_FEATURE_RO_COMPAT_QUOTA |\
+ EXT4_FEATURE_RO_COMPAT_PROJECT)

/*
* Default values for user and/or group using reserved blocks
@@ -1579,6 +1583,11 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
#define EXT4_DEF_RESUID 0
#define EXT4_DEF_RESGID 0

+/*
+ * Default project ID
+ */
+#define EXT4_DEF_PROJID 0
+
#define EXT4_DEF_INODE_READAHEAD_BLKS 32

/*
@@ -2131,6 +2140,8 @@ extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
loff_t lstart, loff_t lend);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
extern qsize_t *ext4_get_reserved_space(struct inode *inode);
+extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
+extern int ext4_set_projid(struct inode *inode, kprojid_t projid);
extern void ext4_da_update_reserve_space(struct inode *inode,
int used, int quota_claim);

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index ac644c3..d81a30d 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -756,6 +756,12 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
inode->i_gid = dir->i_gid;
} else
inode_init_owner(inode, dir, mode);
+
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT))
+ ei->i_projid = EXT4_I(dir)->i_projid;
+ else
+ ei->i_projid = KPROJIDT_INIT(EXT4_DEF_PROJID);
+
dquot_initialize(inode);

if (!goal)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5653fa4..0ae2c39 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3863,6 +3863,53 @@ static inline void ext4_iget_extra_inode(struct inode *inode,
EXT4_I(inode)->i_inline_off = 0;
}

+int ext4_get_projid(struct inode *inode, kprojid_t *projid)
+{
+ struct super_block *sb = inode->i_sb;
+
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT))
+ return -EOPNOTSUPP;
+
+ *projid = EXT4_I(inode)->i_projid;
+ return 0;
+}
+
+/* Called with inode->i_mutex locked. */
+int ext4_set_projid(struct inode *inode, kprojid_t projid)
+{
+ struct super_block *sb = inode->i_sb;
+ struct ext4_inode *raw_inode;
+ struct ext4_iloc iloc;
+ handle_t *handle;
+ int err;
+
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT))
+ return -EOPNOTSUPP;
+
+ /* Sanity check */
+ if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE ||
+ !EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), i_projid))
+ return -EOPNOTSUPP;
+
+ if (projid_eq(EXT4_I(inode)->i_projid, projid))
+ return 0;
+
+ handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (!err) {
+ inode->i_ctime = ext4_current_time(inode);
+ EXT4_I(inode)->i_projid = projid;
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+ }
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+ ext4_journal_stop(handle);
+
+ return err;
+}
+
struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
{
struct ext4_iloc iloc;
@@ -3874,6 +3921,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
int block;
uid_t i_uid;
gid_t i_gid;
+ projid_t i_projid;

inode = iget_locked(sb, ino);
if (!inode)
@@ -3923,12 +3971,20 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
inode->i_mode = le16_to_cpu(raw_inode->i_mode);
i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low);
i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low);
+
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
+ EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))
+ i_projid = (projid_t)le32_to_cpu(raw_inode->i_projid);
+ else
+ i_projid = EXT4_DEF_PROJID;
+
if (!(test_opt(inode->i_sb, NO_UID32))) {
i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16;
i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16;
}
i_uid_write(inode, i_uid);
i_gid_write(inode, i_gid);
+ ei->i_projid = KPROJIDT_INIT(i_projid);
set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));

ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
@@ -4192,6 +4248,15 @@ static int ext4_do_update_inode(handle_t *handle,
raw_inode->i_uid_high = 0;
raw_inode->i_gid_high = 0;
}
+
+ if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
+ EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
+ projid_t i_projid;
+
+ i_projid = from_kprojid(&init_user_ns, ei->i_projid);
+ raw_inode->i_projid = cpu_to_le32(i_projid);
+ }
+
raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);

EXT4_INODE_SET_XTIME(i_ctime, inode, raw_inode);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 2291923..9337d81 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2938,6 +2938,10 @@ static int ext4_link(struct dentry *old_dentry,
if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;

+ if (!capable_mix_inode_project(EXT4_I(dir)->i_projid,
+ EXT4_I(inode)->i_projid))
+ return -EXDEV;
+
dquot_initialize(dir);

retry:
@@ -3217,6 +3221,10 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
int credits;
u8 old_file_type;

+ if (!capable_mix_inode_project(EXT4_I(new.dir)->i_projid,
+ EXT4_I(old.inode)->i_projid))
+ return -EXDEV;
+
dquot_initialize(old.dir);
dquot_initialize(new.dir);

@@ -3395,6 +3403,12 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
u8 new_file_type;
int retval;

+ if (!capable_mix_inode_project(EXT4_I(new.dir)->i_projid,
+ EXT4_I(old.inode)->i_projid) ||
+ !capable_mix_inode_project(EXT4_I(old.dir)->i_projid,
+ EXT4_I(new.inode)->i_projid))
+ return -EXDEV;
+
dquot_initialize(old.dir);
dquot_initialize(new.dir);

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ac64edb..d656269 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1103,6 +1103,8 @@ static const struct super_operations ext4_sops = {
.get_dquots = ext4_get_dquots,
#endif
.bdev_try_to_free_page = bdev_try_to_free_page,
+ .get_projid = ext4_get_projid,
+ .set_projid = ext4_set_projid,
};

static const struct export_operations ext4_export_ops = {


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