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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_trans_item.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/xfs/xfs_trans_item.c')
-rw-r--r-- | fs/xfs/xfs_trans_item.c | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans_item.c b/fs/xfs/xfs_trans_item.c new file mode 100644 index 0000000..1b8a756 --- /dev/null +++ b/fs/xfs/xfs_trans_item.c @@ -0,0 +1,553 @@ +/* + * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ + +#include "xfs.h" +#include "xfs_macros.h" +#include "xfs_types.h" +#include "xfs_inum.h" +#include "xfs_log.h" +#include "xfs_trans.h" + +STATIC int xfs_trans_unlock_chunk(xfs_log_item_chunk_t *, + int, int, xfs_lsn_t); + +/* + * This is called to add the given log item to the transaction's + * list of log items. It must find a free log item descriptor + * or allocate a new one and add the item to that descriptor. + * The function returns a pointer to item descriptor used to point + * to the new item. The log item will now point to its new descriptor + * with its li_desc field. + */ +xfs_log_item_desc_t * +xfs_trans_add_item(xfs_trans_t *tp, xfs_log_item_t *lip) +{ + xfs_log_item_desc_t *lidp; + xfs_log_item_chunk_t *licp; + int i=0; + + /* + * If there are no free descriptors, allocate a new chunk + * of them and put it at the front of the chunk list. + */ + if (tp->t_items_free == 0) { + licp = (xfs_log_item_chunk_t*) + kmem_alloc(sizeof(xfs_log_item_chunk_t), KM_SLEEP); + ASSERT(licp != NULL); + /* + * Initialize the chunk, and then + * claim the first slot in the newly allocated chunk. + */ + XFS_LIC_INIT(licp); + XFS_LIC_CLAIM(licp, 0); + licp->lic_unused = 1; + XFS_LIC_INIT_SLOT(licp, 0); + lidp = XFS_LIC_SLOT(licp, 0); + + /* + * Link in the new chunk and update the free count. + */ + licp->lic_next = tp->t_items.lic_next; + tp->t_items.lic_next = licp; + tp->t_items_free = XFS_LIC_NUM_SLOTS - 1; + + /* + * Initialize the descriptor and the generic portion + * of the log item. + * + * Point the new slot at this item and return it. + * Also point the log item at its currently active + * descriptor and set the item's mount pointer. + */ + lidp->lid_item = lip; + lidp->lid_flags = 0; + lidp->lid_size = 0; + lip->li_desc = lidp; + lip->li_mountp = tp->t_mountp; + return (lidp); + } + + /* + * Find the free descriptor. It is somewhere in the chunklist + * of descriptors. + */ + licp = &tp->t_items; + while (licp != NULL) { + if (XFS_LIC_VACANCY(licp)) { + if (licp->lic_unused <= XFS_LIC_MAX_SLOT) { + i = licp->lic_unused; + ASSERT(XFS_LIC_ISFREE(licp, i)); + break; + } + for (i = 0; i <= XFS_LIC_MAX_SLOT; i++) { + if (XFS_LIC_ISFREE(licp, i)) + break; + } + ASSERT(i <= XFS_LIC_MAX_SLOT); + break; + } + licp = licp->lic_next; + } + ASSERT(licp != NULL); + /* + * If we find a free descriptor, claim it, + * initialize it, and return it. + */ + XFS_LIC_CLAIM(licp, i); + if (licp->lic_unused <= i) { + licp->lic_unused = i + 1; + XFS_LIC_INIT_SLOT(licp, i); + } + lidp = XFS_LIC_SLOT(licp, i); + tp->t_items_free--; + lidp->lid_item = lip; + lidp->lid_flags = 0; + lidp->lid_size = 0; + lip->li_desc = lidp; + lip->li_mountp = tp->t_mountp; + return (lidp); +} + +/* + * Free the given descriptor. + * + * This requires setting the bit in the chunk's free mask corresponding + * to the given slot. + */ +void +xfs_trans_free_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp) +{ + uint slot; + xfs_log_item_chunk_t *licp; + xfs_log_item_chunk_t **licpp; + + slot = XFS_LIC_DESC_TO_SLOT(lidp); + licp = XFS_LIC_DESC_TO_CHUNK(lidp); + XFS_LIC_RELSE(licp, slot); + lidp->lid_item->li_desc = NULL; + tp->t_items_free++; + + /* + * If there are no more used items in the chunk and this is not + * the chunk embedded in the transaction structure, then free + * the chunk. First pull it from the chunk list and then + * free it back to the heap. We didn't bother with a doubly + * linked list here because the lists should be very short + * and this is not a performance path. It's better to save + * the memory of the extra pointer. + * + * Also decrement the transaction structure's count of free items + * by the number in a chunk since we are freeing an empty chunk. + */ + if (XFS_LIC_ARE_ALL_FREE(licp) && (licp != &(tp->t_items))) { + licpp = &(tp->t_items.lic_next); + while (*licpp != licp) { + ASSERT(*licpp != NULL); + licpp = &((*licpp)->lic_next); + } + *licpp = licp->lic_next; + kmem_free(licp, sizeof(xfs_log_item_chunk_t)); + tp->t_items_free -= XFS_LIC_NUM_SLOTS; + } +} + +/* + * This is called to find the descriptor corresponding to the given + * log item. It returns a pointer to the descriptor. + * The log item MUST have a corresponding descriptor in the given + * transaction. This routine does not return NULL, it panics. + * + * The descriptor pointer is kept in the log item's li_desc field. + * Just return it. + */ +/*ARGSUSED*/ +xfs_log_item_desc_t * +xfs_trans_find_item(xfs_trans_t *tp, xfs_log_item_t *lip) +{ + ASSERT(lip->li_desc != NULL); + + return (lip->li_desc); +} + + +/* + * Return a pointer to the first descriptor in the chunk list. + * This does not return NULL if there are none, it panics. + * + * The first descriptor must be in either the first or second chunk. + * This is because the only chunk allowed to be empty is the first. + * All others are freed when they become empty. + * + * At some point this and xfs_trans_next_item() should be optimized + * to quickly look at the mask to determine if there is anything to + * look at. + */ +xfs_log_item_desc_t * +xfs_trans_first_item(xfs_trans_t *tp) +{ + xfs_log_item_chunk_t *licp; + int i; + + licp = &tp->t_items; + /* + * If it's not in the first chunk, skip to the second. + */ + if (XFS_LIC_ARE_ALL_FREE(licp)) { + licp = licp->lic_next; + } + + /* + * Return the first non-free descriptor in the chunk. + */ + ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); + for (i = 0; i < licp->lic_unused; i++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + + return (XFS_LIC_SLOT(licp, i)); + } + cmn_err(CE_WARN, "xfs_trans_first_item() -- no first item"); + return(NULL); +} + + +/* + * Given a descriptor, return the next descriptor in the chunk list. + * This returns NULL if there are no more used descriptors in the list. + * + * We do this by first locating the chunk in which the descriptor resides, + * and then scanning forward in the chunk and the list for the next + * used descriptor. + */ +/*ARGSUSED*/ +xfs_log_item_desc_t * +xfs_trans_next_item(xfs_trans_t *tp, xfs_log_item_desc_t *lidp) +{ + xfs_log_item_chunk_t *licp; + int i; + + licp = XFS_LIC_DESC_TO_CHUNK(lidp); + + /* + * First search the rest of the chunk. The for loop keeps us + * from referencing things beyond the end of the chunk. + */ + for (i = (int)XFS_LIC_DESC_TO_SLOT(lidp) + 1; i < licp->lic_unused; i++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + + return (XFS_LIC_SLOT(licp, i)); + } + + /* + * Now search the next chunk. It must be there, because the + * next chunk would have been freed if it were empty. + * If there is no next chunk, return NULL. + */ + if (licp->lic_next == NULL) { + return (NULL); + } + + licp = licp->lic_next; + ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); + for (i = 0; i < licp->lic_unused; i++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + + return (XFS_LIC_SLOT(licp, i)); + } + ASSERT(0); + /* NOTREACHED */ + return NULL; /* keep gcc quite */ +} + +/* + * This is called to unlock all of the items of a transaction and to free + * all the descriptors of that transaction. + * + * It walks the list of descriptors and unlocks each item. It frees + * each chunk except that embedded in the transaction as it goes along. + */ +void +xfs_trans_free_items( + xfs_trans_t *tp, + int flags) +{ + xfs_log_item_chunk_t *licp; + xfs_log_item_chunk_t *next_licp; + int abort; + + abort = flags & XFS_TRANS_ABORT; + licp = &tp->t_items; + /* + * Special case the embedded chunk so we don't free it below. + */ + if (!XFS_LIC_ARE_ALL_FREE(licp)) { + (void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN); + XFS_LIC_ALL_FREE(licp); + licp->lic_unused = 0; + } + licp = licp->lic_next; + + /* + * Unlock each item in each chunk and free the chunks. + */ + while (licp != NULL) { + ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); + (void) xfs_trans_unlock_chunk(licp, 1, abort, NULLCOMMITLSN); + next_licp = licp->lic_next; + kmem_free(licp, sizeof(xfs_log_item_chunk_t)); + licp = next_licp; + } + + /* + * Reset the transaction structure's free item count. + */ + tp->t_items_free = XFS_LIC_NUM_SLOTS; + tp->t_items.lic_next = NULL; +} + + + +/* + * This is called to unlock the items associated with a transaction. + * Items which were not logged should be freed. + * Those which were logged must still be tracked so they can be unpinned + * when the transaction commits. + */ +void +xfs_trans_unlock_items(xfs_trans_t *tp, xfs_lsn_t commit_lsn) +{ + xfs_log_item_chunk_t *licp; + xfs_log_item_chunk_t *next_licp; + xfs_log_item_chunk_t **licpp; + int freed; + + freed = 0; + licp = &tp->t_items; + + /* + * Special case the embedded chunk so we don't free. + */ + if (!XFS_LIC_ARE_ALL_FREE(licp)) { + freed = xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn); + } + licpp = &(tp->t_items.lic_next); + licp = licp->lic_next; + + /* + * Unlock each item in each chunk, free non-dirty descriptors, + * and free empty chunks. + */ + while (licp != NULL) { + ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); + freed += xfs_trans_unlock_chunk(licp, 0, 0, commit_lsn); + next_licp = licp->lic_next; + if (XFS_LIC_ARE_ALL_FREE(licp)) { + *licpp = next_licp; + kmem_free(licp, sizeof(xfs_log_item_chunk_t)); + freed -= XFS_LIC_NUM_SLOTS; + } else { + licpp = &(licp->lic_next); + } + ASSERT(*licpp == next_licp); + licp = next_licp; + } + + /* + * Fix the free descriptor count in the transaction. + */ + tp->t_items_free += freed; +} + +/* + * Unlock each item pointed to by a descriptor in the given chunk. + * Stamp the commit lsn into each item if necessary. + * Free descriptors pointing to items which are not dirty if freeing_chunk + * is zero. If freeing_chunk is non-zero, then we need to unlock all + * items in the chunk. + * + * Return the number of descriptors freed. + */ +STATIC int +xfs_trans_unlock_chunk( + xfs_log_item_chunk_t *licp, + int freeing_chunk, + int abort, + xfs_lsn_t commit_lsn) +{ + xfs_log_item_desc_t *lidp; + xfs_log_item_t *lip; + int i; + int freed; + + freed = 0; + lidp = licp->lic_descs; + for (i = 0; i < licp->lic_unused; i++, lidp++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + lip = lidp->lid_item; + lip->li_desc = NULL; + + if (commit_lsn != NULLCOMMITLSN) + IOP_COMMITTING(lip, commit_lsn); + if (abort) + lip->li_flags |= XFS_LI_ABORTED; + IOP_UNLOCK(lip); + + /* + * Free the descriptor if the item is not dirty + * within this transaction and the caller is not + * going to just free the entire thing regardless. + */ + if (!(freeing_chunk) && + (!(lidp->lid_flags & XFS_LID_DIRTY) || abort)) { + XFS_LIC_RELSE(licp, i); + freed++; + } + } + + return (freed); +} + + +/* + * This is called to add the given busy item to the transaction's + * list of busy items. It must find a free busy item descriptor + * or allocate a new one and add the item to that descriptor. + * The function returns a pointer to busy descriptor used to point + * to the new busy entry. The log busy entry will now point to its new + * descriptor with its ???? field. + */ +xfs_log_busy_slot_t * +xfs_trans_add_busy(xfs_trans_t *tp, xfs_agnumber_t ag, xfs_extlen_t idx) +{ + xfs_log_busy_chunk_t *lbcp; + xfs_log_busy_slot_t *lbsp; + int i=0; + + /* + * If there are no free descriptors, allocate a new chunk + * of them and put it at the front of the chunk list. + */ + if (tp->t_busy_free == 0) { + lbcp = (xfs_log_busy_chunk_t*) + kmem_alloc(sizeof(xfs_log_busy_chunk_t), KM_SLEEP); + ASSERT(lbcp != NULL); + /* + * Initialize the chunk, and then + * claim the first slot in the newly allocated chunk. + */ + XFS_LBC_INIT(lbcp); + XFS_LBC_CLAIM(lbcp, 0); + lbcp->lbc_unused = 1; + lbsp = XFS_LBC_SLOT(lbcp, 0); + + /* + * Link in the new chunk and update the free count. + */ + lbcp->lbc_next = tp->t_busy.lbc_next; + tp->t_busy.lbc_next = lbcp; + tp->t_busy_free = XFS_LIC_NUM_SLOTS - 1; + + /* + * Initialize the descriptor and the generic portion + * of the log item. + * + * Point the new slot at this item and return it. + * Also point the log item at its currently active + * descriptor and set the item's mount pointer. + */ + lbsp->lbc_ag = ag; + lbsp->lbc_idx = idx; + return (lbsp); + } + + /* + * Find the free descriptor. It is somewhere in the chunklist + * of descriptors. + */ + lbcp = &tp->t_busy; + while (lbcp != NULL) { + if (XFS_LBC_VACANCY(lbcp)) { + if (lbcp->lbc_unused <= XFS_LBC_MAX_SLOT) { + i = lbcp->lbc_unused; + break; + } else { + /* out-of-order vacancy */ + printk("OOO vacancy lbcp 0x%p\n", lbcp); + ASSERT(0); + } + } + lbcp = lbcp->lbc_next; + } + ASSERT(lbcp != NULL); + /* + * If we find a free descriptor, claim it, + * initialize it, and return it. + */ + XFS_LBC_CLAIM(lbcp, i); + if (lbcp->lbc_unused <= i) { + lbcp->lbc_unused = i + 1; + } + lbsp = XFS_LBC_SLOT(lbcp, i); + tp->t_busy_free--; + lbsp->lbc_ag = ag; + lbsp->lbc_idx = idx; + return (lbsp); +} + + +/* + * xfs_trans_free_busy + * Free all of the busy lists from a transaction + */ +void +xfs_trans_free_busy(xfs_trans_t *tp) +{ + xfs_log_busy_chunk_t *lbcp; + xfs_log_busy_chunk_t *lbcq; + + lbcp = tp->t_busy.lbc_next; + while (lbcp != NULL) { + lbcq = lbcp->lbc_next; + kmem_free(lbcp, sizeof(xfs_log_busy_chunk_t)); + lbcp = lbcq; + } + + XFS_LBC_INIT(&tp->t_busy); + tp->t_busy.lbc_unused = 0; +} |