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-rw-r--r--fs/aufs/dinfo.c537
1 files changed, 0 insertions, 537 deletions
diff --git a/fs/aufs/dinfo.c b/fs/aufs/dinfo.c
deleted file mode 100644
index ad6d045c4..000000000
--- a/fs/aufs/dinfo.c
+++ /dev/null
@@ -1,537 +0,0 @@
-/*
- * Copyright (C) 2005-2016 Junjiro R. Okajima
- */
-
-/*
- * dentry private data
- */
-
-#include "aufs.h"
-
-void au_di_init_once(void *_dinfo)
-{
- struct au_dinfo *dinfo = _dinfo;
- static struct lock_class_key aufs_di;
-
- au_rw_init(&dinfo->di_rwsem);
- au_rw_class(&dinfo->di_rwsem, &aufs_di);
-}
-
-struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc)
-{
- struct au_dinfo *dinfo;
- int nbr, i;
-
- dinfo = au_cache_alloc_dinfo();
- if (unlikely(!dinfo))
- goto out;
-
- nbr = au_sbend(sb) + 1;
- if (nbr <= 0)
- nbr = 1;
- dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
- if (dinfo->di_hdentry) {
- au_rw_write_lock_nested(&dinfo->di_rwsem, lsc);
- dinfo->di_bstart = -1;
- dinfo->di_bend = -1;
- dinfo->di_bwh = -1;
- dinfo->di_bdiropq = -1;
- dinfo->di_tmpfile = 0;
- for (i = 0; i < nbr; i++)
- dinfo->di_hdentry[i].hd_id = -1;
- goto out;
- }
-
- au_cache_free_dinfo(dinfo);
- dinfo = NULL;
-
-out:
- return dinfo;
-}
-
-void au_di_free(struct au_dinfo *dinfo)
-{
- struct au_hdentry *p;
- aufs_bindex_t bend, bindex;
-
- /* dentry may not be revalidated */
- bindex = dinfo->di_bstart;
- if (bindex >= 0) {
- bend = dinfo->di_bend;
- p = dinfo->di_hdentry + bindex;
- while (bindex++ <= bend)
- au_hdput(p++);
- }
- kfree(dinfo->di_hdentry);
- au_cache_free_dinfo(dinfo);
-}
-
-void au_di_swap(struct au_dinfo *a, struct au_dinfo *b)
-{
- struct au_hdentry *p;
- aufs_bindex_t bi;
-
- AuRwMustWriteLock(&a->di_rwsem);
- AuRwMustWriteLock(&b->di_rwsem);
-
-#define DiSwap(v, name) \
- do { \
- v = a->di_##name; \
- a->di_##name = b->di_##name; \
- b->di_##name = v; \
- } while (0)
-
- DiSwap(p, hdentry);
- DiSwap(bi, bstart);
- DiSwap(bi, bend);
- DiSwap(bi, bwh);
- DiSwap(bi, bdiropq);
- /* smp_mb(); */
-
-#undef DiSwap
-}
-
-void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src)
-{
- AuRwMustWriteLock(&dst->di_rwsem);
- AuRwMustWriteLock(&src->di_rwsem);
-
- dst->di_bstart = src->di_bstart;
- dst->di_bend = src->di_bend;
- dst->di_bwh = src->di_bwh;
- dst->di_bdiropq = src->di_bdiropq;
- /* smp_mb(); */
-}
-
-int au_di_init(struct dentry *dentry)
-{
- int err;
- struct super_block *sb;
- struct au_dinfo *dinfo;
-
- err = 0;
- sb = dentry->d_sb;
- dinfo = au_di_alloc(sb, AuLsc_DI_CHILD);
- if (dinfo) {
- atomic_set(&dinfo->di_generation, au_sigen(sb));
- /* smp_mb(); */ /* atomic_set */
- dentry->d_fsdata = dinfo;
- } else
- err = -ENOMEM;
-
- return err;
-}
-
-void au_di_fin(struct dentry *dentry)
-{
- struct au_dinfo *dinfo;
-
- dinfo = au_di(dentry);
- AuRwDestroy(&dinfo->di_rwsem);
- au_di_free(dinfo);
-}
-
-int au_di_realloc(struct au_dinfo *dinfo, int nbr)
-{
- int err, sz;
- struct au_hdentry *hdp;
-
- AuRwMustWriteLock(&dinfo->di_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*hdp) * (dinfo->di_bend + 1);
- if (!sz)
- sz = sizeof(*hdp);
- hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS);
- if (hdp) {
- dinfo->di_hdentry = hdp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_write_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_write_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_write_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_write_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_write_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_write_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
-{
- switch (lsc) {
- case AuLsc_DI_CHILD:
- ii_read_lock_child(inode);
- break;
- case AuLsc_DI_CHILD2:
- ii_read_lock_child2(inode);
- break;
- case AuLsc_DI_CHILD3:
- ii_read_lock_child3(inode);
- break;
- case AuLsc_DI_PARENT:
- ii_read_lock_parent(inode);
- break;
- case AuLsc_DI_PARENT2:
- ii_read_lock_parent2(inode);
- break;
- case AuLsc_DI_PARENT3:
- ii_read_lock_parent3(inode);
- break;
- default:
- BUG();
- }
-}
-
-void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
-{
- struct inode *inode;
-
- au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d_really_is_positive(d)) {
- inode = d_inode(d);
- if (au_ftest_lock(flags, IW))
- do_ii_write_lock(inode, lsc);
- else if (au_ftest_lock(flags, IR))
- do_ii_read_lock(inode, lsc);
- }
-}
-
-void di_read_unlock(struct dentry *d, int flags)
-{
- struct inode *inode;
-
- if (d_really_is_positive(d)) {
- inode = d_inode(d);
- if (au_ftest_lock(flags, IW)) {
- au_dbg_verify_dinode(d);
- ii_write_unlock(inode);
- } else if (au_ftest_lock(flags, IR)) {
- au_dbg_verify_dinode(d);
- ii_read_unlock(inode);
- }
- }
- au_rw_read_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_downgrade_lock(struct dentry *d, int flags)
-{
- if (d_really_is_positive(d) && au_ftest_lock(flags, IR))
- ii_downgrade_lock(d_inode(d));
- au_rw_dgrade_lock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock(struct dentry *d, unsigned int lsc)
-{
- au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
- if (d_really_is_positive(d))
- do_ii_write_lock(d_inode(d), lsc);
-}
-
-void di_write_unlock(struct dentry *d)
-{
- au_dbg_verify_dinode(d);
- if (d_really_is_positive(d))
- ii_write_unlock(d_inode(d));
- au_rw_write_unlock(&au_di(d)->di_rwsem);
-}
-
-void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d_inode(d1) == d_inode(d2)
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_child(d1);
- di_write_lock_child2(d2);
- } else {
- /* there should be no races */
- di_write_lock_child(d2);
- di_write_lock_child2(d1);
- }
-}
-
-void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
-{
- AuDebugOn(d1 == d2
- || d_inode(d1) == d_inode(d2)
- || d1->d_sb != d2->d_sb);
-
- if (isdir && au_test_subdir(d1, d2)) {
- di_write_lock_parent(d1);
- di_write_lock_parent2(d2);
- } else {
- /* there should be no races */
- di_write_lock_parent(d2);
- di_write_lock_parent2(d1);
- }
-}
-
-void di_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock(d1);
- if (d_inode(d1) == d_inode(d2))
- au_rw_write_unlock(&au_di(d2)->di_rwsem);
- else
- di_write_unlock(d2);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct dentry *d;
-
- DiMustAnyLock(dentry);
-
- if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
- return NULL;
- AuDebugOn(bindex < 0);
- d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry;
- AuDebugOn(d && au_dcount(d) <= 0);
- return d;
-}
-
-/*
- * extended version of au_h_dptr().
- * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or
- * error.
- */
-struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex)
-{
- struct dentry *h_dentry;
- struct inode *inode, *h_inode;
-
- AuDebugOn(d_really_is_negative(dentry));
-
- h_dentry = NULL;
- if (au_dbstart(dentry) <= bindex
- && bindex <= au_dbend(dentry))
- h_dentry = au_h_dptr(dentry, bindex);
- if (h_dentry && !au_d_linkable(h_dentry)) {
- dget(h_dentry);
- goto out; /* success */
- }
-
- inode = d_inode(dentry);
- AuDebugOn(bindex < au_ibstart(inode));
- AuDebugOn(au_ibend(inode) < bindex);
- h_inode = au_h_iptr(inode, bindex);
- h_dentry = d_find_alias(h_inode);
- if (h_dentry) {
- if (!IS_ERR(h_dentry)) {
- if (!au_d_linkable(h_dentry))
- goto out; /* success */
- dput(h_dentry);
- } else
- goto out;
- }
-
- if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) {
- h_dentry = au_plink_lkup(inode, bindex);
- AuDebugOn(!h_dentry);
- if (!IS_ERR(h_dentry)) {
- if (!au_d_hashed_positive(h_dentry))
- goto out; /* success */
- dput(h_dentry);
- h_dentry = NULL;
- }
- }
-
-out:
- AuDbgDentry(h_dentry);
- return h_dentry;
-}
-
-aufs_bindex_t au_dbtail(struct dentry *dentry)
-{
- aufs_bindex_t bend, bwh;
-
- bend = au_dbend(dentry);
- if (0 <= bend) {
- bwh = au_dbwh(dentry);
- if (!bwh)
- return bwh;
- if (0 < bwh && bwh < bend)
- return bwh - 1;
- }
- return bend;
-}
-
-aufs_bindex_t au_dbtaildir(struct dentry *dentry)
-{
- aufs_bindex_t bend, bopq;
-
- bend = au_dbtail(dentry);
- if (0 <= bend) {
- bopq = au_dbdiropq(dentry);
- if (0 <= bopq && bopq < bend)
- bend = bopq;
- }
- return bend;
-}
-
-/* ---------------------------------------------------------------------- */
-
-void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
- struct dentry *h_dentry)
-{
- struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
- struct au_branch *br;
-
- DiMustWriteLock(dentry);
-
- au_hdput(hd);
- hd->hd_dentry = h_dentry;
- if (h_dentry) {
- br = au_sbr(dentry->d_sb, bindex);
- hd->hd_id = br->br_id;
- }
-}
-
-int au_dbrange_test(struct dentry *dentry)
-{
- int err;
- aufs_bindex_t bstart, bend;
-
- err = 0;
- bstart = au_dbstart(dentry);
- bend = au_dbend(dentry);
- if (bstart >= 0)
- AuDebugOn(bend < 0 && bstart > bend);
- else {
- err = -EIO;
- AuDebugOn(bend >= 0);
- }
-
- return err;
-}
-
-int au_digen_test(struct dentry *dentry, unsigned int sigen)
-{
- int err;
-
- err = 0;
- if (unlikely(au_digen(dentry) != sigen
- || au_iigen_test(d_inode(dentry), sigen)))
- err = -EIO;
-
- return err;
-}
-
-void au_update_digen(struct dentry *dentry)
-{
- atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
- /* smp_mb(); */ /* atomic_set */
-}
-
-void au_update_dbrange(struct dentry *dentry, int do_put_zero)
-{
- struct au_dinfo *dinfo;
- struct dentry *h_d;
- struct au_hdentry *hdp;
-
- DiMustWriteLock(dentry);
-
- dinfo = au_di(dentry);
- if (!dinfo || dinfo->di_bstart < 0)
- return;
-
- hdp = dinfo->di_hdentry;
- if (do_put_zero) {
- aufs_bindex_t bindex, bend;
-
- bend = dinfo->di_bend;
- for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) {
- h_d = hdp[0 + bindex].hd_dentry;
- if (h_d && d_is_negative(h_d))
- au_set_h_dptr(dentry, bindex, NULL);
- }
- }
-
- dinfo->di_bstart = -1;
- while (++dinfo->di_bstart <= dinfo->di_bend)
- if (hdp[0 + dinfo->di_bstart].hd_dentry)
- break;
- if (dinfo->di_bstart > dinfo->di_bend) {
- dinfo->di_bstart = -1;
- dinfo->di_bend = -1;
- return;
- }
-
- dinfo->di_bend++;
- while (0 <= --dinfo->di_bend)
- if (hdp[0 + dinfo->di_bend].hd_dentry)
- break;
- AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0);
-}
-
-void au_update_dbstart(struct dentry *dentry)
-{
- aufs_bindex_t bindex, bend;
- struct dentry *h_dentry;
-
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (d_is_positive(h_dentry)) {
- au_set_dbstart(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-void au_update_dbend(struct dentry *dentry)
-{
- aufs_bindex_t bindex, bstart;
- struct dentry *h_dentry;
-
- bstart = au_dbstart(dentry);
- for (bindex = au_dbend(dentry); bindex >= bstart; bindex--) {
- h_dentry = au_h_dptr(dentry, bindex);
- if (!h_dentry)
- continue;
- if (d_is_positive(h_dentry)) {
- au_set_dbend(dentry, bindex);
- return;
- }
- au_set_h_dptr(dentry, bindex, NULL);
- }
-}
-
-int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
-{
- aufs_bindex_t bindex, bend;
-
- bend = au_dbend(dentry);
- for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
- if (au_h_dptr(dentry, bindex) == h_dentry)
- return bindex;
- return -1;
-}
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