diff options
Diffstat (limited to 'fs/aufs/iinfo.c')
| -rw-r--r-- | fs/aufs/iinfo.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/fs/aufs/iinfo.c b/fs/aufs/iinfo.c new file mode 100644 index 000000000..67ef672a0 --- /dev/null +++ b/fs/aufs/iinfo.c @@ -0,0 +1,264 @@ +/* + * Copyright (C) 2005-2016 Junjiro R. Okajima + */ + +/* + * inode private data + */ + +#include "aufs.h" + +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) +{ + struct inode *h_inode; + + IiMustAnyLock(inode); + + h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode; + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); + return h_inode; +} + +/* todo: hard/soft set? */ +void au_hiput(struct au_hinode *hinode) +{ + au_hn_free(hinode); + dput(hinode->hi_whdentry); + iput(hinode->hi_inode); +} + +unsigned int au_hi_flags(struct inode *inode, int isdir) +{ + unsigned int flags; + const unsigned int mnt_flags = au_mntflags(inode->i_sb); + + flags = 0; + if (au_opt_test(mnt_flags, XINO)) + au_fset_hi(flags, XINO); + if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) + au_fset_hi(flags, HNOTIFY); + return flags; +} + +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, + struct inode *h_inode, unsigned int flags) +{ + struct au_hinode *hinode; + struct inode *hi; + struct au_iinfo *iinfo = au_ii(inode); + + IiMustWriteLock(inode); + + hinode = iinfo->ii_hinode + bindex; + hi = hinode->hi_inode; + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); + + if (hi) + au_hiput(hinode); + hinode->hi_inode = h_inode; + if (h_inode) { + int err; + struct super_block *sb = inode->i_sb; + struct au_branch *br; + + AuDebugOn(inode->i_mode + && (h_inode->i_mode & S_IFMT) + != (inode->i_mode & S_IFMT)); + if (bindex == iinfo->ii_bstart) + au_cpup_igen(inode, h_inode); + br = au_sbr(sb, bindex); + hinode->hi_id = br->br_id; + if (au_ftest_hi(flags, XINO)) { + err = au_xino_write(sb, bindex, h_inode->i_ino, + inode->i_ino); + if (unlikely(err)) + AuIOErr1("failed au_xino_write() %d\n", err); + } + + if (au_ftest_hi(flags, HNOTIFY) + && au_br_hnotifyable(br->br_perm)) { + err = au_hn_alloc(hinode, inode); + if (unlikely(err)) + AuIOErr1("au_hn_alloc() %d\n", err); + } + } +} + +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, + struct dentry *h_wh) +{ + struct au_hinode *hinode; + + IiMustWriteLock(inode); + + hinode = au_ii(inode)->ii_hinode + bindex; + AuDebugOn(hinode->hi_whdentry); + hinode->hi_whdentry = h_wh; +} + +void au_update_iigen(struct inode *inode, int half) +{ + struct au_iinfo *iinfo; + struct au_iigen *iigen; + unsigned int sigen; + + sigen = au_sigen(inode->i_sb); + iinfo = au_ii(inode); + iigen = &iinfo->ii_generation; + spin_lock(&iigen->ig_spin); + iigen->ig_generation = sigen; + if (half) + au_ig_fset(iigen->ig_flags, HALF_REFRESHED); + else + au_ig_fclr(iigen->ig_flags, HALF_REFRESHED); + spin_unlock(&iigen->ig_spin); +} + +/* it may be called at remount time, too */ +void au_update_ibrange(struct inode *inode, int do_put_zero) +{ + struct au_iinfo *iinfo; + aufs_bindex_t bindex, bend; + + iinfo = au_ii(inode); + if (!iinfo) + return; + + IiMustWriteLock(inode); + + if (do_put_zero && iinfo->ii_bstart >= 0) { + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; + bindex++) { + struct inode *h_i; + + h_i = iinfo->ii_hinode[0 + bindex].hi_inode; + if (h_i + && !h_i->i_nlink + && !(h_i->i_state & I_LINKABLE)) + au_set_h_iptr(inode, bindex, NULL, 0); + } + } + + iinfo->ii_bstart = -1; + iinfo->ii_bend = -1; + bend = au_sbend(inode->i_sb); + for (bindex = 0; bindex <= bend; bindex++) + if (iinfo->ii_hinode[0 + bindex].hi_inode) { + iinfo->ii_bstart = bindex; + break; + } + if (iinfo->ii_bstart >= 0) + for (bindex = bend; bindex >= iinfo->ii_bstart; bindex--) + if (iinfo->ii_hinode[0 + bindex].hi_inode) { + iinfo->ii_bend = bindex; + break; + } + AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend); +} + +/* ---------------------------------------------------------------------- */ + +void au_icntnr_init_once(void *_c) +{ + struct au_icntnr *c = _c; + struct au_iinfo *iinfo = &c->iinfo; + static struct lock_class_key aufs_ii; + + spin_lock_init(&iinfo->ii_generation.ig_spin); + au_rw_init(&iinfo->ii_rwsem); + au_rw_class(&iinfo->ii_rwsem, &aufs_ii); + inode_init_once(&c->vfs_inode); +} + +int au_iinfo_init(struct inode *inode) +{ + struct au_iinfo *iinfo; + struct super_block *sb; + int nbr, i; + + sb = inode->i_sb; + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); + nbr = au_sbend(sb) + 1; + if (unlikely(nbr <= 0)) + nbr = 1; + iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); + if (iinfo->ii_hinode) { + au_ninodes_inc(sb); + for (i = 0; i < nbr; i++) + iinfo->ii_hinode[i].hi_id = -1; + + iinfo->ii_generation.ig_generation = au_sigen(sb); + iinfo->ii_bstart = -1; + iinfo->ii_bend = -1; + iinfo->ii_vdir = NULL; + return 0; + } + return -ENOMEM; +} + +int au_ii_realloc(struct au_iinfo *iinfo, int nbr) +{ + int err, sz; + struct au_hinode *hip; + + AuRwMustWriteLock(&iinfo->ii_rwsem); + + err = -ENOMEM; + sz = sizeof(*hip) * (iinfo->ii_bend + 1); + if (!sz) + sz = sizeof(*hip); + hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS); + if (hip) { + iinfo->ii_hinode = hip; + err = 0; + } + + return err; +} + +void au_iinfo_fin(struct inode *inode) +{ + struct au_iinfo *iinfo; + struct au_hinode *hi; + struct super_block *sb; + aufs_bindex_t bindex, bend; + const unsigned char unlinked = !inode->i_nlink; + + iinfo = au_ii(inode); + /* bad_inode case */ + if (!iinfo) + return; + + sb = inode->i_sb; + au_ninodes_dec(sb); + if (si_pid_test(sb)) + au_xino_delete_inode(inode, unlinked); + else { + /* + * it is safe to hide the dependency between sbinfo and + * sb->s_umount. + */ + lockdep_off(); + si_noflush_read_lock(sb); + au_xino_delete_inode(inode, unlinked); + si_read_unlock(sb); + lockdep_on(); + } + + if (iinfo->ii_vdir) + au_vdir_free(iinfo->ii_vdir); + + bindex = iinfo->ii_bstart; + if (bindex >= 0) { + hi = iinfo->ii_hinode + bindex; + bend = iinfo->ii_bend; + while (bindex++ <= bend) { + if (hi->hi_inode) + au_hiput(hi); + hi++; + } + } + kfree(iinfo->ii_hinode); + iinfo->ii_hinode = NULL; + AuRwDestroy(&iinfo->ii_rwsem); +} |