From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs policies for selecting one among multiple writable branches
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/wbr_policy.c | 693 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 693 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/wbr_policy.c b/fs/aufs/wbr_policy.c
new file mode 100644
index 0000000..1e0f1b8
--- /dev/null
+++ b/fs/aufs/wbr_policy.c
@@ -0,0 +1,693 @@
+/*
+ * Copyright (C) 2007-2008 Junjiro Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * policies for selecting one among multiple writable branches
+ *
+ * $Id: wbr_policy.c,v 1.3 2008/04/28 03:04:12 sfjro Exp $
+ */
+
+#include <linux/statfs.h>
+#include "aufs.h"
+
+static int au_cpdown_attr(struct dentry *h_dst, struct dentry *h_src, int dlgt)
+{
+ int err, sbits;
+ struct iattr ia;
+ struct inode *h_idst, *h_isrc;
+ struct vfsub_args vargs;
+
+ LKTRTrace("%.*s\n", AuDLNPair(h_dst));
+ h_idst = h_dst->d_inode;
+ //IMustLock(h_idst);
+ h_isrc = h_src->d_inode;
+ //IMustLock(h_isrc);
+
+ ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
+ ia.ia_mode = h_isrc->i_mode;
+ ia.ia_uid = h_isrc->i_uid;
+ ia.ia_gid = h_isrc->i_gid;
+ sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
+
+ vfsub_args_init(&vargs, NULL, dlgt, /*force_unlink*/0);
+ err = vfsub_notify_change(h_dst, &ia, &vargs);
+
+ /* is this nfs only? */
+ if (!err && sbits && au_test_nfs(h_dst->d_sb)) {
+ ia.ia_valid = ATTR_FORCE | ATTR_MODE;
+ ia.ia_mode = h_isrc->i_mode;
+ err = vfsub_notify_change(h_dst, &ia, &vargs);
+ }
+
+ if (!err)
+ h_idst->i_flags = h_isrc->i_flags; //??
+
+ AuTraceErr(err);
+ return err;
+}
+
+struct au_cpdown_dir_args {
+ struct dentry *parent;
+ unsigned int parent_opq; // bit-flags
+};
+
+static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *h_parent, void *arg)
+{
+ int err, parent_opq, whed, dlgt, do_opq, made_dir, diropq, rerr;
+ struct au_cpdown_dir_args *args = arg;
+ aufs_bindex_t bend, bopq, bstart;
+ struct dentry *h_dentry, *opq_dentry, *wh_dentry;
+ struct inode *h_dir, *h_inode, *inode;
+
+ LKTRTrace("%.*s, b%d\n", AuDLNPair(dentry), bdst);
+ bstart = au_dbstart(dentry);
+ AuDebugOn(bstart <= bdst
+ && bdst <= au_dbend(dentry)
+ && au_h_dptr(dentry, bdst));
+ AuDebugOn(!h_parent);
+ h_dir = h_parent->d_inode;
+ AuDebugOn(!h_dir);
+ IMustLock(h_dir);
+
+ err = au_lkup_neg(dentry, bdst);
+ if (unlikely(err < 0))
+ goto out;
+ h_dentry = au_h_dptr(dentry, bdst);
+ dlgt = !!au_opt_test_dlgt(au_mntflags(dentry->d_sb));
+ err = vfsub_sio_mkdir(h_dir, h_dentry, S_IRWXU | S_IRUGO | S_IXUGO,
+ dlgt);
+ if (unlikely(err))
+ goto out_put;
+
+ made_dir = 1;
+ bend = au_dbend(dentry);
+ bopq = au_dbdiropq(dentry);
+ whed = (au_dbwh(dentry) == bdst);
+ if (!args->parent_opq)
+ args->parent_opq |= (bopq <= bdst);
+ parent_opq = (args->parent_opq && args->parent == dentry);
+ do_opq = 0;
+ diropq = 0;
+ h_inode = h_dentry->d_inode;
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ if (whed || (parent_opq && do_opq)) {
+ opq_dentry = au_diropq_create(dentry, bdst, dlgt);
+ err = PTR_ERR(opq_dentry);
+ if (IS_ERR(opq_dentry)) {
+ mutex_unlock(&h_inode->i_mutex);
+ goto out_dir;
+ }
+ dput(opq_dentry);
+ diropq = 1;
+ }
+
+ err = au_cpdown_attr(h_dentry, au_h_dptr(dentry, bstart), dlgt);
+ mutex_unlock(&h_inode->i_mutex);
+ if (unlikely(err))
+ goto out_opq;
+
+ wh_dentry = NULL;
+ if (whed) {
+ wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, /*ndx*/NULL);
+ err = PTR_ERR(wh_dentry);
+ if (IS_ERR(wh_dentry))
+ goto out_opq;
+ err = 0;
+ if (wh_dentry->d_inode)
+ err = au_wh_unlink_dentry(h_dir, wh_dentry, dentry,
+ NULL, dlgt);
+ dput(wh_dentry);
+ if (unlikely(err))
+ goto out_opq;
+ }
+
+ inode = dentry->d_inode;
+ if (au_ibend(inode) < bdst)
+ au_set_ibend(inode, bdst);
+ au_set_h_iptr(inode, bdst, igrab(h_inode), au_hi_flags(inode, 1));
+ goto out; /* success */
+
+ /* revert */
+ out_opq:
+ if (diropq) {
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ rerr = au_diropq_remove(dentry, bdst, dlgt);
+ mutex_unlock(&h_inode->i_mutex);
+ if (unlikely(rerr)) {
+ AuIOErr("failed removing diropq for %.*s b%d (%d)\n",
+ AuDLNPair(dentry), bdst, rerr);
+ err = -EIO;
+ goto out;
+ }
+ }
+ out_dir:
+ if (made_dir) {
+ rerr = vfsub_sio_rmdir(h_dir, h_dentry, dlgt);
+ if (unlikely(rerr)) {
+ AuIOErr("failed removing %.*s b%d (%d)\n",
+ AuDLNPair(dentry), bdst, rerr);
+ err = -EIO;
+ }
+ }
+ out_put:
+ au_set_h_dptr(dentry, bdst, NULL);
+ if (au_dbend(dentry) == bdst)
+ au_update_dbend(dentry);
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst,
+ struct dentry *locked)
+{
+ int err;
+ struct au_cpdown_dir_args args = {
+ .parent = dget_parent(dentry),
+ .parent_opq = 0
+ };
+
+ LKTRTrace("%.*s, b%d\n", AuDLNPair(dentry), bdst);
+
+ err = au_cp_dirs(dentry, bdst, locked, au_cpdown_dir, &args);
+ dput(args.parent);
+
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies for create */
+
+static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
+{
+ for (; bindex >= 0; bindex--)
+ if (!au_br_rdonly(au_sbr(sb, bindex)))
+ return bindex;
+ return -EROFS;
+}
+
+/* top down parent */
+static int au_wbr_create_tdp(struct dentry *dentry, int isdir)
+{
+ int err, dirperm1;
+ struct super_block *sb;
+ aufs_bindex_t bstart, bindex;
+ struct dentry *parent, *h_parent;
+ struct inode *h_dir;
+
+ LKTRTrace("%.*s, dir %d\n", AuDLNPair(dentry), isdir);
+
+ sb = dentry->d_sb;
+ dirperm1 = !!au_opt_test_dirperm1(au_mntflags(sb));
+ bstart = au_dbstart(dentry);
+ err = bstart;
+ if (!au_br_rdonly(au_sbr(sb, bstart)))
+ goto out;
+
+ err = -EROFS;
+ parent = dget_parent(dentry);
+ for (bindex = au_dbstart(parent); bindex < bstart; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent)
+ continue;
+ h_dir = h_parent->d_inode;
+ if (!h_dir)
+ continue;
+
+ if (!au_br_rdonly(au_sbr(sb, bindex))
+ && (!dirperm1
+ || au_test_h_perm(h_dir, MAY_WRITE | MAY_EXEC,
+ /*dlgt*/0))) {
+ err = bindex;
+ break;
+ }
+ }
+ dput(parent);
+
+ /* bottom up here */
+ if (unlikely(err < 0))
+ err = au_wbr_bu(sb, bstart - 1);
+
+ out:
+ LKTRTrace("b%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* an exception for the policy other than tdp */
+static int au_wbr_create_exp(struct dentry *dentry)
+{
+ int err;
+ struct dentry *parent;
+ aufs_bindex_t bwh, bdiropq;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ err = -1;
+ bwh = au_dbwh(dentry);
+ parent = dget_parent(dentry);
+ bdiropq = au_dbdiropq(parent);
+ if (bwh >= 0) {
+ if (bdiropq >= 0)
+ err = min(bdiropq, bwh);
+ else
+ err = bwh;
+ LKTRTrace("%d\n", err);
+ } else if (bdiropq >= 0) {
+ err = bdiropq;
+ LKTRTrace("%d\n", err);
+ }
+ dput(parent);
+
+ if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
+ err = -1;
+
+ LKTRTrace("%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* round robin */
+static int au_wbr_create_init_rr(struct super_block *sb)
+{
+ int err;
+
+ err = au_wbr_bu(sb, au_sbend(sb));
+ atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
+
+ LKTRTrace("b%d\n", err);
+ return err;
+}
+
+static int au_wbr_create_rr(struct dentry *dentry, int isdir)
+{
+ int err, nbr;
+ struct super_block *sb;
+ atomic_t *next;
+ unsigned int u;
+ aufs_bindex_t bindex, bend;
+
+ //au_debug_on();
+ LKTRTrace("%.*s, dir %d\n", AuDLNPair(dentry), isdir);
+
+ sb = dentry->d_sb;
+ next = NULL;
+ err = au_wbr_create_exp(dentry);
+ if (err >= 0)
+ goto out;
+
+ next = &au_sbi(sb)->si_wbr_rr_next;
+ bend = au_sbend(sb);
+ nbr = bend + 1;
+ for (bindex = 0; bindex <= bend; bindex++) {
+ if (!isdir) {
+ err = atomic_dec_return(next) + 1;
+ /* modulo for 0 is meaningless */
+ if (unlikely(!err))
+ err = atomic_dec_return(next) + 1;
+ } else
+ err = atomic_read(next);
+ LKTRTrace("%d\n", err);
+ u = err;
+ err = u % nbr;
+ LKTRTrace("%d\n", err);
+ if (!au_br_rdonly(au_sbr(sb, err)))
+ break;
+ err = -EROFS;
+ }
+
+ out:
+ LKTRTrace("%d\n", err);
+ //au_debug_off();
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* most free space */
+static void *au_wbr_statfs_arg(struct au_branch *br, struct super_block *sb,
+ aufs_bindex_t bindex)
+{
+ struct super_block *h_sb;
+
+ h_sb = br->br_mnt->mnt_sb;
+
+ if (!au_test_nfs(h_sb))
+ return h_sb->s_root;
+
+ /* sigh,,, why nfs s_root has wrong inode? */
+ return au_di(sb->s_root)->di_hdentry[0 + bindex].hd_dentry;
+}
+
+static void au_mfs(struct dentry *dentry)
+{
+ struct super_block *sb;
+ aufs_bindex_t bindex, bend;
+ int dlgt, err;
+ struct kstatfs st;
+ u64 b, bavail;
+ void *arg;
+ struct au_branch *br;
+ struct au_wbr_mfs *mfs;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ bavail = 0;
+ sb = dentry->d_sb;
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ mfs->mfs_bindex = -EROFS;
+ mfs->mfsrr_bytes = 0;
+ dlgt = !!au_opt_test_dlgt(au_mntflags(sb));
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ br = au_sbr(sb, bindex);
+ if (au_br_rdonly(br))
+ continue;
+ arg = au_wbr_statfs_arg(br, sb, bindex);
+ if (!arg)
+ continue;
+
+ err = vfsub_statfs(arg, &st, dlgt);
+ LKTRTrace("b%d, %d, %Lu\n",
+ bindex, err, (unsigned long long)st.f_bavail);
+ if (unlikely(err)) {
+ AuWarn1("failed statfs, b%d, %d\n", bindex, err);
+ continue;
+ }
+
+ /* when the available size is equal, select lower one */
+ b = st.f_bavail * st.f_bsize;
+ br->br_bytes = b;
+ if (b >= bavail) {
+ bavail = b;
+ mfs->mfs_bindex = bindex;
+ mfs->mfs_jiffy = jiffies;
+ }
+ }
+
+ mfs->mfsrr_bytes = bavail;
+ LKTRTrace("b%d\n", mfs->mfs_bindex);
+}
+
+static int au_wbr_create_mfs(struct dentry *dentry, int isdir)
+{
+ int err;
+ struct super_block *sb;
+ struct au_wbr_mfs *mfs;
+
+ //au_debug_on();
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ sb = dentry->d_sb;
+ err = au_wbr_create_exp(dentry);
+ if (err >= 0)
+ goto out;
+
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ mutex_lock(&mfs->mfs_lock);
+ if (unlikely(time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
+ || mfs->mfs_bindex < 0
+ || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))))
+ au_mfs(dentry);
+ mutex_unlock(&mfs->mfs_lock);
+ err = mfs->mfs_bindex;
+
+ out:
+ LKTRTrace("b%d\n", err);
+ //au_debug_off();
+ return err;
+}
+
+static int au_wbr_create_init_mfs(struct super_block *sb)
+{
+ struct au_wbr_mfs *mfs;
+
+ mfs = &au_sbi(sb)->si_wbr_mfs;
+ LKTRTrace("expire %lu\n", mfs->mfs_expire);
+
+ mutex_init(&mfs->mfs_lock);
+ mfs->mfs_jiffy = 0;
+ mfs->mfs_bindex = -EROFS;
+
+ return 0;
+}
+
+static int au_wbr_create_fin_mfs(struct super_block *sb)
+{
+ AuTraceEnter();
+ mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* most free space and then round robin */
+static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir)
+{
+ int err;
+ struct au_wbr_mfs *mfs;
+
+ //au_debug_on();
+ LKTRTrace("%.*s, %d\n", AuDLNPair(dentry), isdir);
+
+ err = au_wbr_create_mfs(dentry, isdir);
+ if (err >= 0) {
+ mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
+ LKTRTrace("%Lu bytes, %Lu wmark\n",
+ mfs->mfsrr_bytes, mfs->mfsrr_watermark);
+ if (unlikely(mfs->mfsrr_bytes < mfs->mfsrr_watermark))
+ err = au_wbr_create_rr(dentry, isdir);
+ }
+
+ LKTRTrace("b%d\n", err);
+ //au_debug_off();
+ return err;
+}
+
+static int au_wbr_create_init_mfsrr(struct super_block *sb)
+{
+ int err;
+ //au_debug_on();
+ au_wbr_create_init_mfs(sb); /* ignore */
+ err = au_wbr_create_init_rr(sb);
+ //au_debug_off();
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* top down parent and most free space */
+static int au_wbr_create_pmfs(struct dentry *dentry, int isdir)
+{
+ int err, e2, dirperm1;
+ struct super_block *sb;
+ struct dentry *parent, *h_parent;
+ aufs_bindex_t bindex, bstart, bend;
+ struct au_branch *br;
+ u64 b;
+ struct inode *h_dir;
+
+ //au_debug_on();
+ LKTRTrace("%.*s, %d\n", AuDLNPair(dentry), isdir);
+
+ err = au_wbr_create_tdp(dentry, isdir);
+ if (unlikely(err < 0))
+ goto out;
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(parent);
+ bend = au_dbtaildir(parent);
+ if (bstart == bend)
+ goto out_parent; /* success */
+
+ e2 = au_wbr_create_mfs(dentry, isdir);
+ if (e2 < 0)
+ goto out_parent; /* success */
+
+ /* when the available size is equal, select upper one */
+ sb = dentry->d_sb;
+ br = au_sbr(sb, err);
+ dirperm1 = !!au_opt_test_dirperm1(au_mntflags(sb));
+ b = br->br_bytes;
+ LKTRTrace("b%d, %Lu\n", err, b);
+
+ if (unlikely(dirperm1)) {
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent)
+ continue;
+ h_dir = h_parent->d_inode;
+ if (!h_dir)
+ continue;
+
+ br = au_sbr(sb, bindex);
+ if (!au_br_rdonly(br)
+ && au_test_h_perm(h_dir, MAY_WRITE | MAY_EXEC,
+ /*dlgt*/0)
+ && br->br_bytes > b) {
+ b = br->br_bytes;
+ err = bindex;
+ LKTRTrace("b%d, %Lu\n", err, b);
+ }
+ }
+ if (err >= 0)
+ goto out_parent;
+ }
+ for (bindex = bstart; bindex <= bend; bindex++) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent || !h_parent->d_inode)
+ continue;
+
+ br = au_sbr(sb, bindex);
+ if (!au_br_rdonly(br) && br->br_bytes > b) {
+ b = br->br_bytes;
+ err = bindex;
+ LKTRTrace("b%d, %Lu\n", err, b);
+ }
+ }
+
+ out_parent:
+ dput(parent);
+ out:
+ LKTRTrace("b%d\n", err);
+ //au_debug_off();
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* policies for copyup */
+
+/* top down parent */
+static int au_wbr_copyup_tdp(struct dentry *dentry)
+{
+ return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0);
+}
+
+/* bottom up parent */
+static int au_wbr_copyup_bup(struct dentry *dentry)
+{
+ int err, dirperm1;
+ struct dentry *parent, *h_parent;
+ aufs_bindex_t bindex, bstart;
+ struct super_block *sb;
+ struct inode *h_dir;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ err = -EROFS;
+ sb = dentry->d_sb;
+ dirperm1 = !!au_opt_test_dirperm1(au_mntflags(sb));
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(parent);
+ for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) {
+ h_parent = au_h_dptr(parent, bindex);
+ if (!h_parent)
+ continue;
+ h_dir = h_parent->d_inode;
+ if (!h_dir)
+ continue;
+
+ if (!au_br_rdonly(au_sbr(sb, bindex))
+ && (!dirperm1
+ || au_test_h_perm(h_dir, MAY_WRITE | MAY_EXEC,
+ /*dlgt*/0))) {
+ err = bindex;
+ break;
+ }
+ }
+ dput(parent);
+
+ /* bottom up here */
+ if (unlikely(err < 0))
+ err = au_wbr_bu(sb, bstart - 1);
+
+ LKTRTrace("b%d\n", err);
+ return err;
+}
+
+/* bottom up */
+static int au_wbr_copyup_bu(struct dentry *dentry)
+{
+ int err;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ err = au_wbr_bu(dentry->d_sb, au_dbstart(dentry));
+
+ LKTRTrace("b%d\n", err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
+ [AuWbrCopyup_TDP] = {
+ .copyup = au_wbr_copyup_tdp
+ },
+ [AuWbrCopyup_BUP] = {
+ .copyup = au_wbr_copyup_bup
+ },
+ [AuWbrCopyup_BU] = {
+ .copyup = au_wbr_copyup_bu
+ }
+};
+
+struct au_wbr_create_operations au_wbr_create_ops[] = {
+ [AuWbrCreate_TDP] = {
+ .create = au_wbr_create_tdp
+ },
+ [AuWbrCreate_RR] = {
+ .create = au_wbr_create_rr,
+ .init = au_wbr_create_init_rr
+ },
+ [AuWbrCreate_MFS] = {
+ .create = au_wbr_create_mfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSV] = {
+ .create = au_wbr_create_mfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSRR] = {
+ .create = au_wbr_create_mfsrr,
+ .init = au_wbr_create_init_mfsrr,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_MFSRRV] = {
+ .create = au_wbr_create_mfsrr,
+ .init = au_wbr_create_init_mfsrr,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_PMFS] = {
+ .create = au_wbr_create_pmfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ },
+ [AuWbrCreate_PMFSV] = {
+ .create = au_wbr_create_pmfs,
+ .init = au_wbr_create_init_mfs,
+ .fin = au_wbr_create_fin_mfs
+ }
+};
--
1.4.4.4
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