xfs_agnumber_t xfs_filestream_lookup_ag( xfs_inode_t *ip) { xfs_mru_cache_t *cache; fstrm_item_t *item; xfs_agnumber_t ag; int ref; if (!(ip->i_d.di_mode & (S_IFREG | S_IFDIR))) { ASSERT(0); return NULLAGNUMBER; } cache = ip->i_mount->m_filestream; item = xfs_mru_cache_lookup(cache, ip->i_ino); if (!item) { TRACE_LOOKUP(ip->i_mount, ip, NULL, NULLAGNUMBER, 0); return NULLAGNUMBER; } ASSERT(ip == item->ip); ag = item->ag; ref = xfs_filestream_peek_ag(ip->i_mount, ag); xfs_mru_cache_done(cache); TRACE_LOOKUP(ip->i_mount, ip, item->pip, ag, ref); return ag; }
STATIC void xfs_fstrm_free_func( unsigned long ino, void *data) { fstrm_item_t *item = (fstrm_item_t *)data; xfs_inode_t *ip = item->ip; ASSERT(ip->i_ino == ino); xfs_iflags_clear(ip, XFS_IFILESTREAM); xfs_filestream_put_ag(ip->i_mount, item->ag); TRACE_FREE(ip->i_mount, ip, item->pip, item->ag, xfs_filestream_peek_ag(ip->i_mount, item->ag)); IRELE(ip); if (item->pip) IRELE(item->pip); kmem_zone_free(item_zone, item); }
/* xfs_fstrm_free_func(): callback for freeing cached stream items. */ STATIC void xfs_fstrm_free_func( unsigned long ino, void *data) { fstrm_item_t *item = (fstrm_item_t *)data; xfs_inode_t *ip = item->ip; int ref; ASSERT(ip->i_ino == ino); xfs_iflags_clear(ip, XFS_IFILESTREAM); /* Drop the reference taken on the AG when the item was added. */ ref = xfs_filestream_put_ag(ip->i_mount, item->ag); ASSERT(ref >= 0); TRACE_FREE(ip->i_mount, ip, item->pip, item->ag, xfs_filestream_peek_ag(ip->i_mount, item->ag)); /* * _xfs_filestream_update_ag() always takes a reference on the inode * itself, whether it's a file or a directory. Release it here. * This can result in the inode being freed and so we must * not hold any inode locks when freeing filesstreams objects * otherwise we can deadlock here. */ IRELE(ip); /* * In the case of a regular file, _xfs_filestream_update_ag() also * takes a ref on the parent inode to keep it in-core. Release that * too. */ if (item->pip) IRELE(item->pip); /* Finally, free the memory allocated for the item. */ kmem_zone_free(item_zone, item); }
int xfs_filestream_new_ag( xfs_bmalloca_t *ap, xfs_agnumber_t *agp) { int flags, err; xfs_inode_t *ip, *pip = NULL; xfs_mount_t *mp; xfs_mru_cache_t *cache; xfs_extlen_t minlen; fstrm_item_t *dir, *file; xfs_agnumber_t ag = NULLAGNUMBER; ip = ap->ip; mp = ip->i_mount; cache = mp->m_filestream; minlen = ap->alen; *agp = NULLAGNUMBER; /* * Look for the file in the cache, removing it if it's found. Doing * this allows it to be held across the dir lookup that follows. */ file = xfs_mru_cache_remove(cache, ip->i_ino); if (file) { ASSERT(ip == file->ip); /* Save the file's parent inode and old AG number for later. */ pip = file->pip; ag = file->ag; /* Look for the file's directory in the cache. */ dir = xfs_mru_cache_lookup(cache, pip->i_ino); if (dir) { ASSERT(pip == dir->ip); /* * If the directory has already moved on to a new AG, * use that AG as the new AG for the file. Don't * forget to twiddle the AG refcounts to match the * movement. */ if (dir->ag != file->ag) { xfs_filestream_put_ag(mp, file->ag); xfs_filestream_get_ag(mp, dir->ag); *agp = file->ag = dir->ag; } xfs_mru_cache_done(cache); } /* * Put the file back in the cache. If this fails, the free * function needs to be called to tidy up in the same way as if * the item had simply expired from the cache. */ err = xfs_mru_cache_insert(cache, ip->i_ino, file); if (err) { xfs_fstrm_free_func(ip->i_ino, file); return err; } /* * If the file's AG was moved to the directory's new AG, there's * nothing more to be done. */ if (*agp != NULLAGNUMBER) { TRACE_MOVEAG(mp, ip, pip, ag, xfs_filestream_peek_ag(mp, ag), *agp, xfs_filestream_peek_ag(mp, *agp)); return 0; } } /* * If the file's parent directory is known, take its iolock in exclusive * mode to prevent two sibling files from racing each other to migrate * themselves and their parent to different AGs. */ if (pip) xfs_ilock(pip, XFS_IOLOCK_EXCL); /* * A new AG needs to be found for the file. If the file's parent * directory is also known, it will be moved to the new AG as well to * ensure that files created inside it in future use the new AG. */ ag = (ag == NULLAGNUMBER) ? 0 : (ag + 1) % mp->m_sb.sb_agcount; flags = (ap->userdata ? XFS_PICK_USERDATA : 0) | (ap->low ? XFS_PICK_LOWSPACE : 0); err = _xfs_filestream_pick_ag(mp, ag, agp, flags, minlen); if (err || *agp == NULLAGNUMBER) goto exit; /* * If the file wasn't found in the file cache, then its parent directory * inode isn't known. For this to have happened, the file must either * be pre-existing, or it was created long enough ago that its cache * entry has expired. This isn't the sort of usage that the filestreams * allocator is trying to optimise, so there's no point trying to track * its new AG somehow in the filestream data structures. */ if (!pip) { TRACE_ORPHAN(mp, ip, *agp); goto exit; } /* Associate the parent inode with the AG. */ err = _xfs_filestream_update_ag(pip, NULL, *agp); if (err) goto exit; /* Associate the file inode with the AG. */ err = _xfs_filestream_update_ag(ip, pip, *agp); if (err) goto exit; TRACE_MOVEAG(mp, ip, pip, NULLAGNUMBER, 0, *agp, xfs_filestream_peek_ag(mp, *agp)); exit: /* * If _xfs_filestream_pick_ag() returned a valid AG, remove the * reference it took on it, since the file and directory will have taken * their own now if they were successfully cached. */ if (*agp != NULLAGNUMBER) xfs_filestream_put_ag(mp, *agp); else *agp = 0; if (pip) xfs_iunlock(pip, XFS_IOLOCK_EXCL); return err; }
int xfs_filestream_associate( xfs_inode_t *pip, xfs_inode_t *ip) { xfs_mount_t *mp; xfs_mru_cache_t *cache; fstrm_item_t *item; xfs_agnumber_t ag, rotorstep, startag; int err = 0; ASSERT(pip->i_d.di_mode & S_IFDIR); ASSERT(ip->i_d.di_mode & S_IFREG); if (!(pip->i_d.di_mode & S_IFDIR) || !(ip->i_d.di_mode & S_IFREG)) return -EINVAL; mp = pip->i_mount; cache = mp->m_filestream; /* * We have a problem, Houston. * * Taking the iolock here violates inode locking order - we already * hold the ilock. Hence if we block getting this lock we may never * wake. Unfortunately, that means if we can't get the lock, we're * screwed in terms of getting a stream association - we can't spin * waiting for the lock because someone else is waiting on the lock we * hold and we cannot drop that as we are in a transaction here. * * Lucky for us, this inversion is not a problem because it's a * directory inode that we are trying to lock here. * * So, if we can't get the iolock without sleeping then just give up */ if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL)) return 1; /* If the parent directory is already in the cache, use its AG. */ item = xfs_mru_cache_lookup(cache, pip->i_ino); if (item) { ASSERT(item->ip == pip); ag = item->ag; xfs_mru_cache_done(cache); TRACE_LOOKUP(mp, pip, pip, ag, xfs_filestream_peek_ag(mp, ag)); err = _xfs_filestream_update_ag(ip, pip, ag); goto exit; } /* * Set the starting AG using the rotor for inode32, otherwise * use the directory inode's AG. */ if (mp->m_flags & XFS_MOUNT_32BITINODES) { rotorstep = xfs_rotorstep; startag = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount; mp->m_agfrotor = (mp->m_agfrotor + 1) % (mp->m_sb.sb_agcount * rotorstep); } else startag = XFS_INO_TO_AGNO(mp, pip->i_ino); /* Pick a new AG for the parent inode starting at startag. */ err = _xfs_filestream_pick_ag(mp, startag, &ag, 0, 0); if (err || ag == NULLAGNUMBER) goto exit_did_pick; /* Associate the parent inode with the AG. */ err = _xfs_filestream_update_ag(pip, NULL, ag); if (err) goto exit_did_pick; /* Associate the file inode with the AG. */ err = _xfs_filestream_update_ag(ip, pip, ag); if (err) goto exit_did_pick; TRACE_ASSOCIATE(mp, ip, pip, ag, xfs_filestream_peek_ag(mp, ag)); exit_did_pick: /* * If _xfs_filestream_pick_ag() returned a valid AG, remove the * reference it took on it, since the file and directory will have taken * their own now if they were successfully cached. */ if (ag != NULLAGNUMBER) xfs_filestream_put_ag(mp, ag); exit: xfs_iunlock(pip, XFS_IOLOCK_EXCL); return -err; }
static int _xfs_filestream_update_ag( xfs_inode_t *ip, xfs_inode_t *pip, xfs_agnumber_t ag) { int err = 0; xfs_mount_t *mp; xfs_mru_cache_t *cache; fstrm_item_t *item; xfs_agnumber_t old_ag; xfs_inode_t *old_pip; /* * Either ip is a regular file and pip is a directory, or ip is a * directory and pip is NULL. */ ASSERT(ip && (((ip->i_d.di_mode & S_IFREG) && pip && (pip->i_d.di_mode & S_IFDIR)) || ((ip->i_d.di_mode & S_IFDIR) && !pip))); mp = ip->i_mount; cache = mp->m_filestream; item = xfs_mru_cache_lookup(cache, ip->i_ino); if (item) { ASSERT(item->ip == ip); old_ag = item->ag; item->ag = ag; old_pip = item->pip; item->pip = pip; xfs_mru_cache_done(cache); /* * If the AG has changed, drop the old ref and take a new one, * effectively transferring the reference from old to new AG. */ if (ag != old_ag) { xfs_filestream_put_ag(mp, old_ag); xfs_filestream_get_ag(mp, ag); } /* * If ip is a file and its pip has changed, drop the old ref and * take a new one. */ if (pip && pip != old_pip) { IRELE(old_pip); IHOLD(pip); } TRACE_UPDATE(mp, ip, old_ag, xfs_filestream_peek_ag(mp, old_ag), ag, xfs_filestream_peek_ag(mp, ag)); return 0; } item = kmem_zone_zalloc(item_zone, KM_MAYFAIL); if (!item) return ENOMEM; item->ag = ag; item->ip = ip; item->pip = pip; err = xfs_mru_cache_insert(cache, ip->i_ino, item); if (err) { kmem_zone_free(item_zone, item); return err; } /* Take a reference on the AG. */ xfs_filestream_get_ag(mp, ag); /* * Take a reference on the inode itself regardless of whether it's a * regular file or a directory. */ IHOLD(ip); /* * In the case of a regular file, take a reference on the parent inode * as well to ensure it remains in-core. */ if (pip) IHOLD(pip); TRACE_UPDATE(mp, ip, ag, xfs_filestream_peek_ag(mp, ag), ag, xfs_filestream_peek_ag(mp, ag)); return 0; }
/* * Scan the AGs starting at startag looking for an AG that isn't in use and has * at least minlen blocks free. */ static int _xfs_filestream_pick_ag( xfs_mount_t *mp, xfs_agnumber_t startag, xfs_agnumber_t *agp, int flags, xfs_extlen_t minlen) { int err, trylock, nscan; xfs_extlen_t delta, longest, need, free, minfree, maxfree = 0; xfs_agnumber_t ag, max_ag = NULLAGNUMBER; struct xfs_perag *pag; /* 2% of an AG's blocks must be free for it to be chosen. */ minfree = mp->m_sb.sb_agblocks / 50; ag = startag; *agp = NULLAGNUMBER; /* For the first pass, don't sleep trying to init the per-AG. */ trylock = XFS_ALLOC_FLAG_TRYLOCK; for (nscan = 0; 1; nscan++) { TRACE_AG_SCAN(mp, ag, xfs_filestream_peek_ag(mp, ag)); pag = mp->m_perag + ag; if (!pag->pagf_init) { err = xfs_alloc_pagf_init(mp, NULL, ag, trylock); if (err && !trylock) return err; } /* Might fail sometimes during the 1st pass with trylock set. */ if (!pag->pagf_init) goto next_ag; /* Keep track of the AG with the most free blocks. */ if (pag->pagf_freeblks > maxfree) { maxfree = pag->pagf_freeblks; max_ag = ag; } /* * The AG reference count does two things: it enforces mutual * exclusion when examining the suitability of an AG in this * loop, and it guards against two filestreams being established * in the same AG as each other. */ if (xfs_filestream_get_ag(mp, ag) > 1) { xfs_filestream_put_ag(mp, ag); goto next_ag; } need = XFS_MIN_FREELIST_PAG(pag, mp); delta = need > pag->pagf_flcount ? need - pag->pagf_flcount : 0; longest = (pag->pagf_longest > delta) ? (pag->pagf_longest - delta) : (pag->pagf_flcount > 0 || pag->pagf_longest > 0); if (((minlen && longest >= minlen) || (!minlen && pag->pagf_freeblks >= minfree)) && (!pag->pagf_metadata || !(flags & XFS_PICK_USERDATA) || (flags & XFS_PICK_LOWSPACE))) { /* Break out, retaining the reference on the AG. */ free = pag->pagf_freeblks; *agp = ag; break; } /* Drop the reference on this AG, it's not usable. */ xfs_filestream_put_ag(mp, ag); next_ag: /* Move to the next AG, wrapping to AG 0 if necessary. */ if (++ag >= mp->m_sb.sb_agcount) ag = 0; /* If a full pass of the AGs hasn't been done yet, continue. */ if (ag != startag) continue; /* Allow sleeping in xfs_alloc_pagf_init() on the 2nd pass. */ if (trylock != 0) { trylock = 0; continue; } /* Finally, if lowspace wasn't set, set it for the 3rd pass. */ if (!(flags & XFS_PICK_LOWSPACE)) { flags |= XFS_PICK_LOWSPACE; continue; } /* * Take the AG with the most free space, regardless of whether * it's already in use by another filestream. */ if (max_ag != NULLAGNUMBER) { xfs_filestream_get_ag(mp, max_ag); TRACE_AG_PICK1(mp, max_ag, maxfree); free = maxfree; *agp = max_ag; break; } /* take AG 0 if none matched */ TRACE_AG_PICK1(mp, max_ag, maxfree); *agp = 0; return 0; } TRACE_AG_PICK2(mp, startag, *agp, xfs_filestream_peek_ag(mp, *agp), free, nscan, flags); return 0; }
int xfs_filestream_new_ag( xfs_bmalloca_t *ap, xfs_agnumber_t *agp) { int flags, err; xfs_inode_t *ip, *pip = NULL; xfs_mount_t *mp; xfs_mru_cache_t *cache; xfs_extlen_t minlen; fstrm_item_t *dir, *file; xfs_agnumber_t ag = NULLAGNUMBER; ip = ap->ip; mp = ip->i_mount; cache = mp->m_filestream; minlen = ap->length; *agp = NULLAGNUMBER; file = xfs_mru_cache_remove(cache, ip->i_ino); if (file) { ASSERT(ip == file->ip); pip = file->pip; ag = file->ag; dir = xfs_mru_cache_lookup(cache, pip->i_ino); if (dir) { ASSERT(pip == dir->ip); if (dir->ag != file->ag) { xfs_filestream_put_ag(mp, file->ag); xfs_filestream_get_ag(mp, dir->ag); *agp = file->ag = dir->ag; } xfs_mru_cache_done(cache); } err = xfs_mru_cache_insert(cache, ip->i_ino, file); if (err) { xfs_fstrm_free_func(ip->i_ino, file); return err; } if (*agp != NULLAGNUMBER) { TRACE_MOVEAG(mp, ip, pip, ag, xfs_filestream_peek_ag(mp, ag), *agp, xfs_filestream_peek_ag(mp, *agp)); return 0; } } if (pip) xfs_ilock(pip, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT); ag = (ag == NULLAGNUMBER) ? 0 : (ag + 1) % mp->m_sb.sb_agcount; flags = (ap->userdata ? XFS_PICK_USERDATA : 0) | (ap->flist->xbf_low ? XFS_PICK_LOWSPACE : 0); err = _xfs_filestream_pick_ag(mp, ag, agp, flags, minlen); if (err || *agp == NULLAGNUMBER) goto exit; if (!pip) { TRACE_ORPHAN(mp, ip, *agp); goto exit; } err = _xfs_filestream_update_ag(pip, NULL, *agp); if (err) goto exit; err = _xfs_filestream_update_ag(ip, pip, *agp); if (err) goto exit; TRACE_MOVEAG(mp, ip, pip, NULLAGNUMBER, 0, *agp, xfs_filestream_peek_ag(mp, *agp)); exit: if (*agp != NULLAGNUMBER) xfs_filestream_put_ag(mp, *agp); else *agp = 0; if (pip) xfs_iunlock(pip, XFS_IOLOCK_EXCL); return err; }
int xfs_filestream_associate( xfs_inode_t *pip, xfs_inode_t *ip) { xfs_mount_t *mp; xfs_mru_cache_t *cache; fstrm_item_t *item; xfs_agnumber_t ag, rotorstep, startag; int err = 0; ASSERT(S_ISDIR(pip->i_d.di_mode)); ASSERT(S_ISREG(ip->i_d.di_mode)); if (!S_ISDIR(pip->i_d.di_mode) || !S_ISREG(ip->i_d.di_mode)) return -EINVAL; mp = pip->i_mount; cache = mp->m_filestream; if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL)) return 1; item = xfs_mru_cache_lookup(cache, pip->i_ino); if (item) { ASSERT(item->ip == pip); ag = item->ag; xfs_mru_cache_done(cache); TRACE_LOOKUP(mp, pip, pip, ag, xfs_filestream_peek_ag(mp, ag)); err = _xfs_filestream_update_ag(ip, pip, ag); goto exit; } if (mp->m_flags & XFS_MOUNT_32BITINODES) { rotorstep = xfs_rotorstep; startag = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount; mp->m_agfrotor = (mp->m_agfrotor + 1) % (mp->m_sb.sb_agcount * rotorstep); } else startag = XFS_INO_TO_AGNO(mp, pip->i_ino); err = _xfs_filestream_pick_ag(mp, startag, &ag, 0, 0); if (err || ag == NULLAGNUMBER) goto exit_did_pick; err = _xfs_filestream_update_ag(pip, NULL, ag); if (err) goto exit_did_pick; err = _xfs_filestream_update_ag(ip, pip, ag); if (err) goto exit_did_pick; TRACE_ASSOCIATE(mp, ip, pip, ag, xfs_filestream_peek_ag(mp, ag)); exit_did_pick: if (ag != NULLAGNUMBER) xfs_filestream_put_ag(mp, ag); exit: xfs_iunlock(pip, XFS_IOLOCK_EXCL); return -err; }
static int _xfs_filestream_update_ag( xfs_inode_t *ip, xfs_inode_t *pip, xfs_agnumber_t ag) { int err = 0; xfs_mount_t *mp; xfs_mru_cache_t *cache; fstrm_item_t *item; xfs_agnumber_t old_ag; xfs_inode_t *old_pip; ASSERT(ip && ((S_ISREG(ip->i_d.di_mode) && pip && S_ISDIR(pip->i_d.di_mode)) || (S_ISDIR(ip->i_d.di_mode) && !pip))); mp = ip->i_mount; cache = mp->m_filestream; item = xfs_mru_cache_lookup(cache, ip->i_ino); if (item) { ASSERT(item->ip == ip); old_ag = item->ag; item->ag = ag; old_pip = item->pip; item->pip = pip; xfs_mru_cache_done(cache); if (ag != old_ag) { xfs_filestream_put_ag(mp, old_ag); xfs_filestream_get_ag(mp, ag); } if (pip && pip != old_pip) { IRELE(old_pip); IHOLD(pip); } TRACE_UPDATE(mp, ip, old_ag, xfs_filestream_peek_ag(mp, old_ag), ag, xfs_filestream_peek_ag(mp, ag)); return 0; } item = kmem_zone_zalloc(item_zone, KM_MAYFAIL); if (!item) return ENOMEM; item->ag = ag; item->ip = ip; item->pip = pip; err = xfs_mru_cache_insert(cache, ip->i_ino, item); if (err) { kmem_zone_free(item_zone, item); return err; } xfs_filestream_get_ag(mp, ag); IHOLD(ip); if (pip) IHOLD(pip); TRACE_UPDATE(mp, ip, ag, xfs_filestream_peek_ag(mp, ag), ag, xfs_filestream_peek_ag(mp, ag)); return 0; }