This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
support for ext4. The interface is kept consistent with
XFS_IOC_FSGETXATTR/XFS_IOC_FSGETXATTR.
Signed-off-by: Li Xi <[email protected]>
---
fs/ext4/ext4.h | 47 +++++++
fs/ext4/ioctl.c | 341 +++++++++++++++++++++++++++++++++--------------
fs/xfs/xfs_fs.h | 47 +++----
include/uapi/linux/fs.h | 32 +++++
4 files changed, 338 insertions(+), 129 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3443456..2f4b9ba 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -385,6 +385,51 @@ struct flex_groups {
#define EXT4_FL_USER_VISIBLE 0x204BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */
+#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
+ EXT4_IMMUTABLE_FL | \
+ EXT4_APPEND_FL | \
+ EXT4_NOATIME_FL | \
+ EXT4_PROJINHERIT_FL)
+
+/* Transfer internal flags to xflags */
+static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
+{
+ __u32 xflags = 0;
+
+ if (iflags & EXT4_SYNC_FL)
+ xflags |= FS_XFLAG_SYNC;
+ if (iflags & EXT4_IMMUTABLE_FL)
+ xflags |= FS_XFLAG_IMMUTABLE;
+ if (iflags & EXT4_APPEND_FL)
+ xflags |= FS_XFLAG_APPEND;
+ if (iflags & EXT4_NOATIME_FL)
+ xflags |= FS_XFLAG_NOATIME;
+ if (iflags & EXT4_PROJINHERIT_FL)
+ xflags |= FS_XFLAG_PROJINHERIT;
+ return xflags;
+}
+
+/* Transfer xflags flags to internal */
+static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
+{
+ unsigned long iflags = 0;
+
+ if (xflags & FS_XFLAG_SYNC)
+ iflags |= EXT4_SYNC_FL;
+ if (xflags & FS_XFLAG_IMMUTABLE)
+ iflags |= EXT4_IMMUTABLE_FL;
+ if (xflags & FS_XFLAG_APPEND)
+ iflags |= EXT4_APPEND_FL;
+ if (xflags & FS_XFLAG_NODUMP)
+ iflags |= EXT4_NODUMP_FL;
+ if (xflags & FS_XFLAG_NOATIME)
+ iflags |= EXT4_NOATIME_FL;
+ if (xflags & FS_XFLAG_PROJINHERIT)
+ iflags |= EXT4_PROJINHERIT_FL;
+
+ return iflags;
+}
+
/* Flags that should be inherited by new inodes from their parent. */
#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
@@ -607,6 +652,8 @@ enum {
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
+#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
+#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index f58a0d1..20a6337 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -14,6 +14,8 @@
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/file.h>
+#include <linux/quotaops.h>
+#include <linux/quota.h>
#include <asm/uaccess.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@@ -196,126 +198,229 @@ journal_err_out:
return err;
}
-long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+static int ext4_ioctl_setflags(struct file *filp,
+ unsigned int flags, int is_from_xflags)
{
struct inode *inode = file_inode(filp);
- struct super_block *sb = inode->i_sb;
struct ext4_inode_info *ei = EXT4_I(inode);
- unsigned int flags;
+ handle_t *handle = NULL;
+ int err, migrate = 0;
+ struct ext4_iloc iloc;
+ unsigned int oldflags, mask, i;
+ unsigned int jflag;
- ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
+ if (!inode_owner_or_capable(inode))
+ return -EACCES;
- switch (cmd) {
- case EXT4_IOC_GETFLAGS:
- ext4_get_inode_flags(ei);
- flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
- return put_user(flags, (int __user *) arg);
- case EXT4_IOC_SETFLAGS: {
- handle_t *handle = NULL;
- int err, migrate = 0;
- struct ext4_iloc iloc;
- unsigned int oldflags, mask, i;
- unsigned int jflag;
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
- if (!inode_owner_or_capable(inode))
- return -EACCES;
+ flags = ext4_mask_flags(inode->i_mode, flags);
+ if (is_from_xflags)
+ flags &= EXT4_FL_XFLAG_VISIBLE;
+
+ err = -EPERM;
+ mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode))
+ goto flags_out;
+
+ oldflags = ei->i_flags;
+ if (is_from_xflags)
+ oldflags &= EXT4_FL_XFLAG_VISIBLE;
+
+ /* The JOURNAL_DATA flag is modifiable only by root */
+ jflag = flags & EXT4_JOURNAL_DATA_FL;
+ if (is_from_xflags)
+ jflag &= EXT4_FL_XFLAG_VISIBLE;
+
+ /*
+ * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+ * the relevant capability.
+ *
+ * This test looks nicer. Thanks to Pauline Middelink
+ */
+ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
+ if (!capable(CAP_LINUX_IMMUTABLE))
+ goto flags_out;
+ }
- if (get_user(flags, (int __user *) arg))
- return -EFAULT;
+ /*
+ * The JOURNAL_DATA flag can only be changed by
+ * the relevant capability.
+ */
+ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
+ if (!capable(CAP_SYS_RESOURCE))
+ goto flags_out;
+ }
+ if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
+ migrate = 1;
+ 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)
+ ext4_truncate(inode);
- err = mnt_want_write_file(filp);
- if (err)
- return err;
+ handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto flags_out;
+ }
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ goto flags_err;
+
+ for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
+ if (!(mask & EXT4_FL_USER_MODIFIABLE))
+ continue;
+ if (is_from_xflags && !(mask & EXT4_FL_XFLAG_VISIBLE))
+ continue;
+ if (mask & flags)
+ ext4_set_inode_flag(inode, i);
+ else
+ ext4_clear_inode_flag(inode, i);
+ }
- flags = ext4_mask_flags(inode->i_mode, flags);
+ ext4_set_inode_flags(inode);
+ inode->i_ctime = ext4_current_time(inode);
- err = -EPERM;
- mutex_lock(&inode->i_mutex);
- /* Is it quota file? Do not allow user to mess with it */
- if (IS_NOQUOTA(inode))
- goto flags_out;
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+flags_err:
+ ext4_journal_stop(handle);
+ if (err)
+ goto flags_out;
+
+ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
+ err = ext4_change_inode_journal_flag(inode, jflag);
+ if (err)
+ goto flags_out;
+ if (migrate) {
+ if (flags & EXT4_EXTENTS_FL)
+ err = ext4_ext_migrate(inode);
+ else
+ err = ext4_ind_migrate(inode);
+ }
- oldflags = ei->i_flags;
+flags_out:
+ mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(filp);
+ return err;
+}
- /* The JOURNAL_DATA flag is modifiable only by root */
- jflag = flags & EXT4_JOURNAL_DATA_FL;
+static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
+{
+ struct inode *inode = file_inode(filp);
+ struct super_block *sb = inode->i_sb;
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ int err;
+ handle_t *handle;
+ kprojid_t kprojid;
+ struct ext4_iloc iloc;
+ struct ext4_inode *raw_inode;
+
+ struct dquot *transfer_to[EXT4_MAXQUOTAS] = { };
+
+ /* Make sure caller can change project. */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (projid != EXT4_DEF_PROJID
+ && !EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_PROJECT))
+ return -EOPNOTSUPP;
+
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_PROJECT)) {
+ BUG_ON(__kprojid_val(EXT4_I(inode)->i_projid)
+ != EXT4_DEF_PROJID);
+ if (projid != EXT4_DEF_PROJID)
+ return -EOPNOTSUPP;
+ else
+ return 0;
+ }
- /*
- * The IMMUTABLE and APPEND_ONLY flags can only be changed by
- * the relevant capability.
- *
- * This test looks nicer. Thanks to Pauline Middelink
- */
- if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
- if (!capable(CAP_LINUX_IMMUTABLE))
- goto flags_out;
- }
+ kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
- /*
- * The JOURNAL_DATA flag can only be changed by
- * the relevant capability.
- */
- if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
- if (!capable(CAP_SYS_RESOURCE))
- goto flags_out;
- }
- if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
- migrate = 1;
+ if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
+ return 0;
- 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)
- ext4_truncate(inode);
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
- handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
- if (IS_ERR(handle)) {
- err = PTR_ERR(handle);
- goto flags_out;
- }
- if (IS_SYNC(inode))
- ext4_handle_sync(handle);
- err = ext4_reserve_inode_write(handle, inode, &iloc);
- if (err)
- goto flags_err;
-
- for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
- if (!(mask & EXT4_FL_USER_MODIFIABLE))
- continue;
- if (mask & flags)
- ext4_set_inode_flag(inode, i);
- else
- ext4_clear_inode_flag(inode, i);
- }
+ err = -EPERM;
+ mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode))
+ goto project_out;
- ext4_set_inode_flags(inode);
- inode->i_ctime = ext4_current_time(inode);
+ dquot_initialize(inode);
- err = ext4_mark_iloc_dirty(handle, inode, &iloc);
-flags_err:
- ext4_journal_stop(handle);
- if (err)
- goto flags_out;
+ handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
+ EXT4_QUOTA_INIT_BLOCKS(sb) +
+ EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto project_out;
+ }
- if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
- err = ext4_change_inode_journal_flag(inode, jflag);
- if (err)
- goto flags_out;
- if (migrate) {
- if (flags & EXT4_EXTENTS_FL)
- err = ext4_ext_migrate(inode);
- else
- err = ext4_ind_migrate(inode);
- }
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ goto project_stop;
-flags_out:
- mutex_unlock(&inode->i_mutex);
- mnt_drop_write_file(filp);
- return err;
+ raw_inode = ext4_raw_inode(&iloc);
+ if ((EXT4_INODE_SIZE(sb) <=
+ EXT4_GOOD_OLD_INODE_SIZE) ||
+ (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))) {
+ err = -EFBIG;
+ goto project_stop;
}
+
+ transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
+ if (!transfer_to[PRJQUOTA])
+ goto project_set;
+
+ err = __dquot_transfer(inode, transfer_to);
+ dqput(transfer_to[PRJQUOTA]);
+ if (err)
+ goto project_stop;
+
+project_set:
+ EXT4_I(inode)->i_projid = kprojid;
+ inode->i_ctime = ext4_current_time(inode);
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+project_stop:
+ ext4_journal_stop(handle);
+project_out:
+ mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(filp);
+ return err;
+}
+
+long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct super_block *sb = inode->i_sb;
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ unsigned int flags;
+
+ ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
+
+ switch (cmd) {
+ case EXT4_IOC_GETFLAGS:
+ ext4_get_inode_flags(ei);
+ flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
+ return put_user(flags, (int __user *) arg);
+ case EXT4_IOC_SETFLAGS:
+ if (get_user(flags, (int __user *) arg))
+ return -EFAULT;
+ return ext4_ioctl_setflags(filp, flags, 0);
case EXT4_IOC_GETVERSION:
case EXT4_IOC_GETVERSION_OLD:
return put_user(inode->i_generation, (int __user *) arg);
@@ -615,7 +720,45 @@ resizefs_out:
}
case EXT4_IOC_PRECACHE_EXTENTS:
return ext4_ext_precache(inode);
+ case EXT4_IOC_FSGETXATTR:
+ {
+ struct fsxattr fa;
+
+ memset(&fa, 0, sizeof(struct fsxattr));
+
+ ext4_get_inode_flags(ei);
+ fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
+
+ if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+ EXT4_FEATURE_RO_COMPAT_PROJECT)) {
+ fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
+ EXT4_I(inode)->i_projid);
+ }
+
+ if (copy_to_user((struct fsxattr __user *)arg,
+ &fa, sizeof(fa)))
+ return -EFAULT;
+ return 0;
+ }
+ case EXT4_IOC_FSSETXATTR:
+ {
+ struct fsxattr fa;
+ int err;
+
+ if (copy_from_user(&fa, (struct fsxattr __user *)arg,
+ sizeof(fa)))
+ return -EFAULT;
+ err = ext4_ioctl_setflags(filp, ext4_xflags_to_iflags(fa.fsx_xflags), 1);
+ if (err)
+ return err;
+
+ err = ext4_ioctl_setproject(filp, fa.fsx_projid);
+ if (err)
+ return err;
+
+ return 0;
+ }
default:
return -ENOTTY;
}
diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index 18dc721..64c7ae6 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -36,38 +36,25 @@ struct dioattr {
#endif
/*
- * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
- */
-#ifndef HAVE_FSXATTR
-struct fsxattr {
- __u32 fsx_xflags; /* xflags field value (get/set) */
- __u32 fsx_extsize; /* extsize field value (get/set)*/
- __u32 fsx_nextents; /* nextents field value (get) */
- __u32 fsx_projid; /* project identifier (get/set) */
- unsigned char fsx_pad[12];
-};
-#endif
-
-/*
* Flags for the bs_xflags/fsx_xflags field
* There should be a one-to-one correspondence between these flags and the
* XFS_DIFLAG_s.
*/
-#define XFS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
-#define XFS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
-#define XFS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
-#define XFS_XFLAG_APPEND 0x00000010 /* all writes append */
-#define XFS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
-#define XFS_XFLAG_NOATIME 0x00000040 /* do not update access time */
-#define XFS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
-#define XFS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
-#define XFS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
-#define XFS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
-#define XFS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
-#define XFS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
-#define XFS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
-#define XFS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
-#define XFS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
+#define XFS_XFLAG_REALTIME FS_XFLAG_REALTIME /* data in realtime volume */
+#define XFS_XFLAG_PREALLOC FS_XFLAG_PREALLOC /* preallocated file extents */
+#define XFS_XFLAG_IMMUTABLE FS_XFLAG_IMMUTABLE /* file cannot be modified */
+#define XFS_XFLAG_APPEND FS_XFLAG_APPEND /* all writes append */
+#define XFS_XFLAG_SYNC FS_XFLAG_SYNC /* all writes synchronous */
+#define XFS_XFLAG_NOATIME FS_XFLAG_NOATIME /* do not update access time */
+#define XFS_XFLAG_NODUMP FS_XFLAG_NODUMP /* do not include in backups */
+#define XFS_XFLAG_RTINHERIT FS_XFLAG_RTINHERIT /* create with rt bit set */
+#define XFS_XFLAG_PROJINHERIT FS_XFLAG_PROJINHERIT /* create with parents projid */
+#define XFS_XFLAG_NOSYMLINKS FS_XFLAG_NOSYMLINKS /* disallow symlink creation */
+#define XFS_XFLAG_EXTSIZE FS_XFLAG_EXTSIZE /* extent size allocator hint */
+#define XFS_XFLAG_EXTSZINHERIT FS_XFLAG_EXTSZINHERIT /* inherit inode extent size */
+#define XFS_XFLAG_NODEFRAG FS_XFLAG_NODEFRAG /* do not defragment */
+#define XFS_XFLAG_FILESTREAM FS_XFLAG_FILESTREAM /* use filestream allocator */
+#define XFS_XFLAG_HASATTR FS_XFLAG_HASATTR /* no DIFLAG for this */
/*
* Structure for XFS_IOC_GETBMAP.
@@ -503,8 +490,8 @@ typedef struct xfs_swapext
#define XFS_IOC_ALLOCSP _IOW ('X', 10, struct xfs_flock64)
#define XFS_IOC_FREESP _IOW ('X', 11, struct xfs_flock64)
#define XFS_IOC_DIOINFO _IOR ('X', 30, struct dioattr)
-#define XFS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr)
-#define XFS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr)
+#define XFS_IOC_FSGETXATTR FS_IOC_FSGETXATTR
+#define XFS_IOC_FSSETXATTR FS_IOC_FSSETXATTR
#define XFS_IOC_ALLOCSP64 _IOW ('X', 36, struct xfs_flock64)
#define XFS_IOC_FREESP64 _IOW ('X', 37, struct xfs_flock64)
#define XFS_IOC_GETBMAP _IOWR('X', 38, struct getbmap)
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index fcbf647..20bb694 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -58,6 +58,36 @@ struct inodes_stat_t {
long dummy[5]; /* padding for sysctl ABI compatibility */
};
+/*
+ * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
+ */
+struct fsxattr {
+ __u32 fsx_xflags; /* xflags field value (get/set) */
+ __u32 fsx_extsize; /* extsize field value (get/set)*/
+ __u32 fsx_nextents; /* nextents field value (get) */
+ __u32 fsx_projid; /* project identifier (get/set) */
+ unsigned char fsx_pad[12];
+};
+
+/*
+ * Flags for the fsx_xflags field
+ */
+#define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
+#define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
+#define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
+#define FS_XFLAG_APPEND 0x00000010 /* all writes append */
+#define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
+#define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
+#define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
+#define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
+#define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
+#define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
+#define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
+#define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
+#define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
+#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
+#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
+
#define NR_FILE 8192 /* this can well be larger on a larger system */
@@ -163,6 +193,8 @@ struct inodes_stat_t {
#define FS_IOC_GETVERSION _IOR('v', 1, long)
#define FS_IOC_SETVERSION _IOW('v', 2, long)
#define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
+#define FS_IOC_FSGETXATTR _IOR('f', 31, struct fsxattr)
+#define FS_IOC_FSSETXATTR _IOW('f', 32, struct fsxattr)
#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
#define FS_IOC32_GETVERSION _IOR('v', 1, int)
--
1.7.1
On Wed, Mar 11, 2015 at 6:03 AM, Li Xi <[email protected]> wrote:
> This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
> support for ext4. The interface is kept consistent with
> XFS_IOC_FSGETXATTR/XFS_IOC_FSGETXATTR.
>
> Signed-off-by: Li Xi <[email protected]>
> ---
> @@ -503,8 +490,8 @@ typedef struct xfs_swapext
> #define XFS_IOC_ALLOCSP _IOW ('X', 10, struct xfs_flock64)
> #define XFS_IOC_FREESP _IOW ('X', 11, struct xfs_flock64)
> #define XFS_IOC_DIOINFO _IOR ('X', 30, struct dioattr)
> -#define XFS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr)
> -#define XFS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr)
> +#define XFS_IOC_FSGETXATTR FS_IOC_FSGETXATTR
> +#define XFS_IOC_FSSETXATTR FS_IOC_FSSETXATTR
XFS ioctls use letter 'X'.
>
> @@ -163,6 +193,8 @@ struct inodes_stat_t {
> #define FS_IOC_GETVERSION _IOR('v', 1, long)
> #define FS_IOC_SETVERSION _IOW('v', 2, long)
> #define FS_IOC_FIEMAP _IOWR('f', 11, struct fiemap)
> +#define FS_IOC_FSGETXATTR _IOR('f', 31, struct fsxattr)
> +#define FS_IOC_FSSETXATTR _IOW('f', 32, struct fsxattr)
You add 'f'. They're different.
> #define FS_IOC32_GETFLAGS _IOR('f', 1, int)
> #define FS_IOC32_SETFLAGS _IOW('f', 2, int)
> #define FS_IOC32_GETVERSION _IOR('v', 1, int)
> --
> 1.7.1
>
> --
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On Wed 11-03-15 12:03:22, Li Xi wrote:
> This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
> support for ext4. The interface is kept consistent with
> XFS_IOC_FSGETXATTR/XFS_IOC_FSGETXATTR.
Thanks for the patch! I think we are getting to a working solution :) Apart
from the bug Konstantin pointed out, I have a few comments below.
> Signed-off-by: Li Xi <[email protected]>
> ---
> fs/ext4/ext4.h | 47 +++++++
> fs/ext4/ioctl.c | 341 +++++++++++++++++++++++++++++++++--------------
> fs/xfs/xfs_fs.h | 47 +++----
> include/uapi/linux/fs.h | 32 +++++
> 4 files changed, 338 insertions(+), 129 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 3443456..2f4b9ba 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -385,6 +385,51 @@ struct flex_groups {
> #define EXT4_FL_USER_VISIBLE 0x204BDFFF /* User visible flags */
> #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */
>
> +#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
> + EXT4_IMMUTABLE_FL | \
> + EXT4_APPEND_FL | \
> + EXT4_NOATIME_FL | \
> + EXT4_PROJINHERIT_FL)
> +
> +/* Transfer internal flags to xflags */
> +static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
> +{
> + __u32 xflags = 0;
> +
> + if (iflags & EXT4_SYNC_FL)
> + xflags |= FS_XFLAG_SYNC;
> + if (iflags & EXT4_IMMUTABLE_FL)
> + xflags |= FS_XFLAG_IMMUTABLE;
> + if (iflags & EXT4_APPEND_FL)
> + xflags |= FS_XFLAG_APPEND;
> + if (iflags & EXT4_NOATIME_FL)
> + xflags |= FS_XFLAG_NOATIME;
> + if (iflags & EXT4_PROJINHERIT_FL)
> + xflags |= FS_XFLAG_PROJINHERIT;
> + return xflags;
> +}
I think EXT4_NODUMP_FL is missing in EXT4_FL_XFLAG_VISIBLE and isn't
handled in ext4_iflags_to_xflags().
> +/* Transfer xflags flags to internal */
> +static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
> +{
> + unsigned long iflags = 0;
> +
> + if (xflags & FS_XFLAG_SYNC)
> + iflags |= EXT4_SYNC_FL;
> + if (xflags & FS_XFLAG_IMMUTABLE)
> + iflags |= EXT4_IMMUTABLE_FL;
> + if (xflags & FS_XFLAG_APPEND)
> + iflags |= EXT4_APPEND_FL;
> + if (xflags & FS_XFLAG_NODUMP)
> + iflags |= EXT4_NODUMP_FL;
> + if (xflags & FS_XFLAG_NOATIME)
> + iflags |= EXT4_NOATIME_FL;
> + if (xflags & FS_XFLAG_PROJINHERIT)
> + iflags |= EXT4_PROJINHERIT_FL;
> +
> + return iflags;
> +}
These two functions are only used in fs/ext4/ioctl.c. So just move their
definition there.
...
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index f58a0d1..20a6337 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -14,6 +14,8 @@
> #include <linux/compat.h>
> #include <linux/mount.h>
> #include <linux/file.h>
> +#include <linux/quotaops.h>
> +#include <linux/quota.h>
> #include <asm/uaccess.h>
> #include "ext4_jbd2.h"
> #include "ext4.h"
> @@ -196,126 +198,229 @@ journal_err_out:
> return err;
> }
>
> -long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> +static int ext4_ioctl_setflags(struct file *filp,
> + unsigned int flags, int is_from_xflags)
> {
Hum, I think we can get rid of the is_from_xflags argument. As I'm
looking into the code below the only real reason why we have is_from_xflags
is that we need to compare old value of flags against new value of flags
and see what has changed. So what we can do is that FSSETXATTR ioctl will
construct flags to pass to ext4_ioctl_setflags() like:
flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
(flags & EXT4_FL_XFLAG_VISIBLE);
That way we don't change any flags outside of EXT4_FL_XFLAG_VISIBLE and
ext4_ioctl_setflags() doesn't have to be aware about different callers. The
only downside is that we need to hold i_mutex to reliably create 'flags'
value which requires moving mnt_want_write_file() and
mutex_lock(&inode->i_mutex) into the caller but that's pretty simple.
> struct inode *inode = file_inode(filp);
> - struct super_block *sb = inode->i_sb;
> struct ext4_inode_info *ei = EXT4_I(inode);
> - unsigned int flags;
> + handle_t *handle = NULL;
> + int err, migrate = 0;
> + struct ext4_iloc iloc;
> + unsigned int oldflags, mask, i;
> + unsigned int jflag;
>
> - ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
> + if (!inode_owner_or_capable(inode))
> + return -EACCES;
>
> - switch (cmd) {
> - case EXT4_IOC_GETFLAGS:
> - ext4_get_inode_flags(ei);
> - flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
> - return put_user(flags, (int __user *) arg);
> - case EXT4_IOC_SETFLAGS: {
> - handle_t *handle = NULL;
> - int err, migrate = 0;
> - struct ext4_iloc iloc;
> - unsigned int oldflags, mask, i;
> - unsigned int jflag;
> + err = mnt_want_write_file(filp);
> + if (err)
> + return err;
>
> - if (!inode_owner_or_capable(inode))
> - return -EACCES;
> + flags = ext4_mask_flags(inode->i_mode, flags);
> + if (is_from_xflags)
> + flags &= EXT4_FL_XFLAG_VISIBLE;
> +
> + err = -EPERM;
> + mutex_lock(&inode->i_mutex);
> + /* Is it quota file? Do not allow user to mess with it */
> + if (IS_NOQUOTA(inode))
> + goto flags_out;
> +
> + oldflags = ei->i_flags;
> + if (is_from_xflags)
> + oldflags &= EXT4_FL_XFLAG_VISIBLE;
> +
> + /* The JOURNAL_DATA flag is modifiable only by root */
> + jflag = flags & EXT4_JOURNAL_DATA_FL;
> + if (is_from_xflags)
> + jflag &= EXT4_FL_XFLAG_VISIBLE;
> +
> + /*
> + * The IMMUTABLE and APPEND_ONLY flags can only be changed by
> + * the relevant capability.
> + *
> + * This test looks nicer. Thanks to Pauline Middelink
> + */
> + if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
> + if (!capable(CAP_LINUX_IMMUTABLE))
> + goto flags_out;
> + }
>
> - if (get_user(flags, (int __user *) arg))
> - return -EFAULT;
> + /*
> + * The JOURNAL_DATA flag can only be changed by
> + * the relevant capability.
> + */
> + if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
> + if (!capable(CAP_SYS_RESOURCE))
> + goto flags_out;
> + }
> + if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
> + migrate = 1;
> + 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)
> + ext4_truncate(inode);
>
> - err = mnt_want_write_file(filp);
> - if (err)
> - return err;
> + handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
> + if (IS_ERR(handle)) {
> + err = PTR_ERR(handle);
> + goto flags_out;
> + }
> + if (IS_SYNC(inode))
> + ext4_handle_sync(handle);
> + err = ext4_reserve_inode_write(handle, inode, &iloc);
> + if (err)
> + goto flags_err;
> +
> + for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
> + if (!(mask & EXT4_FL_USER_MODIFIABLE))
> + continue;
> + if (is_from_xflags && !(mask & EXT4_FL_XFLAG_VISIBLE))
> + continue;
> + if (mask & flags)
> + ext4_set_inode_flag(inode, i);
> + else
> + ext4_clear_inode_flag(inode, i);
> + }
>
> - flags = ext4_mask_flags(inode->i_mode, flags);
> + ext4_set_inode_flags(inode);
> + inode->i_ctime = ext4_current_time(inode);
>
> - err = -EPERM;
> - mutex_lock(&inode->i_mutex);
> - /* Is it quota file? Do not allow user to mess with it */
> - if (IS_NOQUOTA(inode))
> - goto flags_out;
> + err = ext4_mark_iloc_dirty(handle, inode, &iloc);
> +flags_err:
> + ext4_journal_stop(handle);
> + if (err)
> + goto flags_out;
> +
> + if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
> + err = ext4_change_inode_journal_flag(inode, jflag);
> + if (err)
> + goto flags_out;
> + if (migrate) {
> + if (flags & EXT4_EXTENTS_FL)
> + err = ext4_ext_migrate(inode);
> + else
> + err = ext4_ind_migrate(inode);
> + }
>
> - oldflags = ei->i_flags;
> +flags_out:
> + mutex_unlock(&inode->i_mutex);
> + mnt_drop_write_file(filp);
> + return err;
> +}
>
> - /* The JOURNAL_DATA flag is modifiable only by root */
> - jflag = flags & EXT4_JOURNAL_DATA_FL;
> +static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
> +{
> + struct inode *inode = file_inode(filp);
> + struct super_block *sb = inode->i_sb;
> + struct ext4_inode_info *ei = EXT4_I(inode);
> + int err;
> + handle_t *handle;
> + kprojid_t kprojid;
> + struct ext4_iloc iloc;
> + struct ext4_inode *raw_inode;
> +
> + struct dquot *transfer_to[EXT4_MAXQUOTAS] = { };
> +
> + /* Make sure caller can change project. */
> + if (!capable(CAP_SYS_ADMIN))
> + return -EACCES;
> +
> + if (projid != EXT4_DEF_PROJID
> + && !EXT4_HAS_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_PROJECT))
> + return -EOPNOTSUPP;
> +
> + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_PROJECT)) {
> + BUG_ON(__kprojid_val(EXT4_I(inode)->i_projid)
> + != EXT4_DEF_PROJID);
> + if (projid != EXT4_DEF_PROJID)
> + return -EOPNOTSUPP;
> + else
> + return 0;
> + }
Why is the test here twice? The first one seems to be redundant...
Honza
--
Jan Kara <[email protected]>
SUSE Labs, CR