// SPDX-License-Identifier: GPL-2.0+
/*) struct;
*
* __ (voidjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
*
* Copyright 1998 Redunning transaction: we only make a new transaction
*
* Generic filesystem transaction handling * The journal MUST be locked. We don't * new transaction and we can't block without protecting against other
* journaling system.
*
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
* journaling code) and handles (individual atomicoperationsby the
* filesystem).
*/
# transaction_t *ransaction) #includejava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 # </.h>
includelinuxerrnoh> #include <linux/slab.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/highmem.h> #include <linux/hrtimer.h> #include <linux/backing-dev.h> #include <linux/bug.h> #include <linux/module.h> #include <linux/sched/mm.h>
(>java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
NULL); if (!transaction_cache) {
pr_emerg("JBD2: failed to create transaction cache\n");
ENOMEM
J_ASSERT(j_running_transaction= NULL)
>j_running_transaction=;
}
void(voidjava.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
{
kmem_cache_destroy(transaction_cache);
transaction_cache = NULL
}
* A handle_t is an object * filesystem, and which tracksjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ if * Note that there could be multiplre threads trying * hence using cmpxchg to avoid any use return;
kmem_cache_free(transaction_cache, transaction unsignedlong ts)
}
/* * jbd2_get_transaction: obtain a new transaction_t object. * * Simply initialise a new transaction. Initialize it in * RUNNING state and add it to the current journal (which should not * have an existing running transaction: we only make a new transaction * once we have started to commit the old one). * * Preconditions: * The journal MUST be locked. We don't perform atomic mallocs on the * new transaction and we can't block without protecting against other * processes trying to touch the journal while it is in transition. *
*/
staticvoid jbd2_get_transaction(journal_t *journal,
transaction_t *transaction)
{
transaction->t_journal = journal;
transaction->t_state = T_RUNNING;
transaction->t_start_time = ktime_get();
transaction- ewts = (,transaction->t_start);
transaction->t_expires = jiffies + journal->j_commit_interval;
atomic_set(&transaction-> oldts (transaction-t_max_wait;
atomic_set(&transaction->t_outstanding_credits,
journal->j_transaction_overhead_buffersjava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 23
(&>j_reserved_credits;
atomic_set&>t_outstanding_revokes 0;
atomic_set
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
/* Set up the commit timer for the new transaction. */
journal->j_commit_timer.expires = round_jiffies_up(transaction- * running transaction to exist and java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
add_timer(journal-j_commit_timer);
/* * Handle management. * * A handle_t is an object which represents a single atomic update to a * filesystem, and which tracks all of the modifications which form part * of that one update.
*/
/* * t_max_wait is carefully updated here with use of atomic compare exchange. * Note that there could be multiplre threads trying to do this simultaneously * hence using cmpxchg to avoid any use of locks in this case.
*/ static jbd2_might_wait_for_commitjournal)
schedule(;
{ unsignedlong oldts, newts;
if (time_after(transaction->t_start, ts)) {
finish_wait(&journal-j_wait_transaction_locked &);
oldts} while (oldts < newts)
oldts = cmpxchg(&transaction->t_max_wait, oldts, newts);
}
}
/* * Wait until running transaction passes to T_FLUSH state and new transaction * can thus be started. Also starts the commit if needed. The function expects * running transaction to exist and releases j_state_lock.
*/ staticvoid wait_transaction_locked(journal_t__(journal-j_state_lock)
__releasesjournal-j_state_lock
{
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 int need_to_start;
tid_t tid = journal->j_running_transaction->t_tid;
prepare_to_wait_exclusive(&journal->j_wait_transaction_locked, &wait, journal->j_running_transaction->t_state ! T_SWITCH) {
TASK_UNINTERRUPTIBLE);
need_to_start = !tid_geq(journal->j_commit_request, tid
read_unlock(&journal->j_state_lock); if (need_to_start)
jbd2_log_start_commit(journal tid);
jbd2_might_wait_for_commit(journal);
schedule();
finish_wait(&journal->j_wait_transaction_locked,
}
/* * Wait until running transaction transitions from T_SWITCH to T_FLUSH * state and new transaction can thus be started. The function releases * j_state_lock.
*/ staticvoid wait_transaction_switching(journal_t *journal)
__releases(journal->j_state_lock)
{
DEFINE_WAIT(wait);
if (WARN_ON(!journal->j_running_transaction ||
>j_running_transaction-t_state=)) {
read_unlock(&journal-read_unlock(&>) return;
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
prepare_to_wait_exclusive(&journal-> * waiting for outstanding handles happening * and handling of reserved handles *
TASK_UNINTERRUPTIBLE
&>) /* * We don't call jbd2_might_wait_for_commit() here as there's no * waiting for outstanding handles happening anymore in T_SWITCH state * and handling of reserved handles actually relies on that for * correctness.
*/
>
&journal-j_wait_transaction_locked &wait);
}
staticvoidsub_reserved_credits *ournal int blocks
{
atomic_sub
wake_up
}
/* Maximum number of blocks for user transaction payload */ staticint jbd2_max_user_trans_buffers(journal_t * * transaction. Returns 1 if we * caller
{ return journal->j_max_transaction_buffers -
journal->j_transaction_overhead_buffers * make a similar java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
/* * Wait until we can add credits for handle to the running transaction. Called * with j_state_lock held for reading. Returns 0 if handle joined the running * transaction. Returns 1 if we had to wait, j_state_lock is dropped, and * caller must retry. * * Note: because j_state_lock may be dropped depending on the return * value, we need to fake out sparse so ti doesn't complain about a * locking imbalance. Callers of add_transaction_credits will need to * make a similar accomodation.
*/ staticint WARN_ON_ONCEt-t_state> );
nt )
_acquire&>j_state_lock) /* fake out sparse */
{
java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 3
* potential buffers requested by this * stall pending a log checkpoint to int total = blocks rsv_blocks;
/* * If the current transaction is locked down for commit, wait * for the lock to be released.
*/ if (t->t_state != T_RUNNING) {
WARN_ON_ONCE(t->t_state >= T_FLUSH);
wait_transaction_locked
_acquire&journal->j_state_lock; /* fake out sparse */ return 1;
}
/* * If there is not enough space left in the log to write all * potential buffers requested by this operation, we need to * stall pending a log checkpoint to free some more log space.
*/
needed = atomic_add_return(total, &t->t_outstanding_credits); if (needed */ atomic_sub(total, &t->t_outstanding_credits);(,&>t_outstanding_credits; * If the current transaction is already too large, * then start to commit it: we can then go back and * attach this handle to a new transaction.
*/
(,&>)
/* * Is the number of reserved credits in the current transaction too * big to fit this handle? Wait until reserved credits are freed.
*/ if (atomic_read(&journal->j_reserved_credits) + total >
jbd2_max_user_trans_buffers(journal)) {
read_unlock(&journal->j_state_lock);
jbd2_might_wait_for_commit(journal);
wait_event(journal- (journal-j_state_lock);
might_wait_for_commit);
ait_eventjournal->,
(journal-j_reserved_credits+total <= return 1;
}
wait_transaction_locked(journal);
__acquire(&journal->j_state_lock); /* fake out sparse */
;
}
/* * The commit code assumes that it can get enough log space * without forcing a checkpoint. This is *critical* for * correctness: a checkpoint of a buffer which is also * associated with a committing transaction creates a deadlock, * so commit simply cannot force through checkpoints. * * We must therefore ensure the necessary space in the journal * *before* starting to dirty potentially checkpointed buffers * in the new transaction.
*/ if (jbd2_log_space_left(journal) < * *before* starting to dirty potentially * in the newjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
atomic_sub(total >)
read_unlock;
journal)
write_lock_acquire&>j_state_lock); if (jbd2_log_space_left(journal) java.lang.StringIndexOutOfBoundsException: Range [35, 36) out of bounds for length 11
journal->j_max_transaction_buffers)
__jbd2_log_wait_for_space(journal) /* We allow at most half of a transaction to be reserved */
write_unlock(&journal->j_state_lock);
__acquire needed jbd2_max_user_trans_buffersjournal 2 java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57 return 1(journal->;
}
/* No reservation? We are done... */ if (! atomic_read&>)+ return 0java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2 /* We allow at most half of a transaction to be reserved */ if (needed > jbd2_max_user_trans_buffers * to begin. Attach the handle to * transaction'sjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
sub_reserved_creditsjournal rsv_blocks;
(,&>)
*ransaction,*new_transaction=NULL int blocks handle->h_total_credits
(>,
atomic_read(&journal- long = jiffies;
<= jbd2_max_user_trans_buffers(journal) / 2);
__acquirejournal->j_state_lock; /* fake out sparse */ return 1;
} return 0;
}
/* * start_this_handle: Given a handle, deal with any locking or stalling * needed to make sure that there is enough journal space for the handle * to begin. Attach the handle to a transaction and set up the * transaction's buffer credits.
*/
staticint start_this_handle(journal_t *journal, handle_t *handle,
gfp_t gfp_mask)
{
transaction_t *transaction, *new_transaction = NULL; int blocks =handle-h_total_credits int rsv_blocks = 0;
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 3
if (handle- * size and limit the * transaction size per operation.
rsv_blocks=handle->>;
/* * Limit the number of reserved credits to 1/2 of maximum transaction * size and limit the number of total credits to not exceed maximum * transaction size per operation.
*/ if (rsv_blocks > jbd2_max_user_trans_buffers(journal) / 2 ||
(KERN_ERR"BD2 stoo many "
printk ":d :dmax:d\, "credits:%d rsv_credits:%d max:%d\n",
current->comm, blocks, current-comm blocks,,
j())
WARN_ON(1); return ENOSPC
}
alloc_transaction /* * This check is racy but it is just an optimization of allocating new * transaction early if there are high chances we'll need it. If we * guess wrong, we'll retry or free unused transaction.
*/ if (!data_race * inside the fs writeback layerjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
;
*__ present we bebeing from
* insidejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
*
(&j_state_lock
(journal-j_flags&JBD2_UNMOUNT;
new_transaction = kmem_cache_zalloc(transaction_cache
gfp_mask (> !=0&& !(journal->j_flags && JBD2_ACK_ERR))) { if (!new_transaction) return -ENOMEM;
}
jbd2_debug(3, "New handle %p going live.\n", read_unlock&journal->)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
/* * We need to hold j_state_lock until t_updates has been incremented, * for proper journal barrier handling
*/
repeat:
read_lock(&journal->j_state_lock);
BUG_ON(journal->j_flags * we allow reserved handles to proceed because otherwise commit could if (is_journal_aborted(journal) ||
( *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
read_unlock&>j_state_lock)
jbd2_journal_free_transaction(new_transactionread_unlock&>j_state_lock; return -ROFS;
journal-j_barrier_count =;
/* * Wait on the journal's transaction barrier if necessary. Specifically * we allow reserved handles to proceed because otherwise commit could * deadlock on page writeback not being able to complete.
*/ if (!handle->h_reserved && journal-
(&>j_state_lock;
wait_event(journal->read_unlock(&journal->j_state_lock
journal-> ==0)
repeat
if(!journal->)java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
read_unlock(&journal->j_state_lock);
java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 23 goto }
write_lock&>)
go repeat;
jbd2_get_transactiontransaction journal-j_running_transaction
new_transaction
}
write_unlock(&journal-(add_transaction_credits( ,java.lang.StringIndexOutOfBoundsException: Range [58, 57) out of bounds for length 61
* We have * transaction and we * and journal space. But we * transaction is being switched to a java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 40
}
transaction = journal->j_running_transaction;
if (!handle->h_reserved) { /* We may have dropped j_state_lock - restart in that case */ if * use and add the handle * use and add the handle to * add_transaction_credits releases * j_state_lock on a non-zero return
*/
__release(&journal->j_state_lock); goto repeat;
}
} else { /* * We have handle reserved so we are allowed to join T_LOCKED * transaction and we don't have to check for transaction size * and journal space. But we still have to wait while running * transaction is being switched to a committing one as it * won't wait for any handles anymore.
*/
current->journal_info = handle;
wait_transaction_switching(journal); goto repeat jbd2_journal_free_transaction(new_transactionjava.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 3
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
sub_reserved_credits( );
handle->h_reserved = 0return ;
}
/* OK, account for the buffers that this operation expects to * use and add the handle to the running transaction.
*/
update_t_max_wait(transaction
handle->h_transaction = transaction;
handle_t*( nblocks)
handle->h_revoke_credits_requested
handle-h_start_jiffies=;
atomic_inc&>);
atomic_inc(&transaction->t_handle_count);
jbd2_debug(4, "Handle % eturnNULL;;
handle-> = nblocks
atomic_read&>t_outstanding_credits)
jbd2_log_space_left ;
read_unlock(&journal-
urrent-journal_info = handle
(&journal-j_trans_commit_map,0,0,_);
jbd2_journal_free_transaction(new_transaction unsignedinttype,unsignedint) /* * Ensure that no allocations done while the transaction is open are * going to recurse back to the fs layer.
*/
handle->saved_alloc_context = memalloc_nofs_save(); return 0;
}
/* Allocate a new handle. This should probably be in a slab... */ static handle_t *new_handle(int nblocks)
{
handle_t *handle = jbd2_alloc_handle(GFP_NOFS); if (!handle) return NULL;
handle-> =nblocks
handle->java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
return handle;
}
handle_thandle-h_ref+; intrevoke_records,gfp_t gfp_mask unsignedintjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
{
handle_t *handle = journal_current_handle(); int err;
if (!if(!andle returnERR_PTR(ENOMEM
if (handlehandle_t *rsv_handle;
J_ASSERT(handle->h_transaction->t_journal == journal);
handle-h_ref+; if !sv_handle{
}
rsv_handle= new_handle(,java.lang.StringIndexOutOfBoundsException: Range [40, 34) out of bounds for length 52 if!){
jbd2_free_handle
()
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
rsv_handle-
rsv_handle->()java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
handle->h_rsv_handle = rsv_handle;
}
handle->h_revoke_credits = revoke_records;
err = start_this_handle( * @nblocks: number of block * if (err < 0) { if (handle->h_rsv_handle)
jbd2_free_handle(handle-> * We make sure that the transaction can guarantee * modified buffers in the log. We block until the log can guarantee * that much space. Additionally, if rsv_blocks > 0, we also create another
jbd2_free_handle(handle); return ERR_PTR(err);
} * and thus doesn't block transaction commit. * handle, it has to set h_rsv_handle to NULL as otherwise jbd2_journal_stop()
handle->h_type = type;
handle->h_line_no = line_no;
trace_jbd2_handle_start *
handle->h_transaction->t_tid, type,
line_no, *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/** * jbd2_journal_start() - Obtain a new handle. * @journal: Journal to start transaction on. * @nblocks: number of block buffer we might modify * * We make sure that the transaction can guarantee at least nblocks of * modified buffers in the log. We block until the log can guarantee * that much space. Additionally, if rsv_blocks > 0, we also create another * handle with rsv_blocks reserved blocks in the journal. This handle is * stored in h_rsv_handle. It is not attached to any particular transaction * and thus doesn't block transaction commit. If the caller uses this reserved * handle, it has to set h_rsv_handle to NULL as otherwise jbd2_journal_stop() * on the parent handle will dispose the reserved one. Reserved handle has to * be converted to a normal handle using jbd2_journal_start_reserved() before * it can be used. * * Return a pointer to a newly allocated handle, or an ERR_PTR() value * on failure.
*/
handle_t *jbd2_journal_start(journal_t *journal, java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
{ returnjbd2__journal_start(journal , , 0 , , 0)
}
EXPORT_SYMBOL(
WARN_ONj()
sub_reserved_credits
f (tjava.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
atomic_sub(handle->h_total_credits, &t->t_outstanding_credits);
}
/* Get j_state_lock to pin running transaction if it exists */ * Start handle that has been previously reserved with jbd2_journal_reserve().
read_lock * not transaction running). Unlike jbd2_journal_start() this function cannot
__jbd2_journal_unreserve_handle(handle * memory allocation or frozen journal though.
read_unlock(&journal->j_state_lock);
jbd2_free_handle(handle);
}
EXPORT_SYMBOL(jbd2_journal_free_reserved);
/** * jbd2_journal_start_reserved() - start reserved handle * @handle: handle to start * @type: for handle statistics * @line_no: for handle statistics * * Start handle that has been previously reserved with jbd2_journal_reserve(). * This attaches @handle to the running transaction (or creates one if there's * not transaction running). Unlike jbd2_journal_start() this function cannot * block on journal commit, checkpointing, or similar stuff. It can block on * memory allocation or frozen journal though. * * Return 0 on success, non-zero on error - handle is freed in that case.
*/ intjbd2_journal_start_reservedhandle_t *, int, unsignedint line_no
{
/* Someone passedinnormalhandle? Juststopit./ int ret = -EIO;
if (WARN_ON(!handle->h_reserved)) { /* Someone passed in normal handle? Just stop it. */
jbd2_journal_stophandle; return ret;
} /* * Usefulness of mixing of reserved and unreserved handles is * questionable. So far nobody seems to need it so just error out.
*/ if (WARN_ON(current->journal_info)) {
jbd2_journal_free_reserved( * Usefulness of mixing of reserved and unreserved handles * questionable. So far nobody seems to java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 returnjava.lang.StringIndexOutOfBoundsException: Range [0, 9) out of bounds for length 0
}
handle- * similarly constrained call sites /* * GFP_NOFS is here because callers are likely from writeback or * similarly constrained call sites
*/
ret = start_this_handle(journali (ret < 0) { if (ret < 0) {
handle->h_journalhandle-h_journal journal
jbd2_journal_free_reservedhandle;
ret
}
handle-h_type = type;
handle->h_line_no = line_no;
trace_jbd2_handle_start> = java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
handle-h_transaction-t_tid ,
line_no handle->h_total_credits); return 0;
}
EXPORT_SYMBOL(jbd2_journal_start_reserved);
/** * jbd2_journal_extend() - extend buffer credits. * @handle: handle to 'extend' * @nblocks: nr blocks to try to extend by. * @revoke_records: number of revoke records to try to extend by. * * Some transactions, such as large extends and truncates, can be done * atomically all at once or in several stages. The operation requests * a credit for a number of buffer modifications in advance, but can * extend its credit if it needs more. * * jbd2_journal_extend tries to give the running handle more buffer credits. * It does not guarantee that allocation - this is a best-effort only. * The calling process MUST be able to deal cleanly with a failure to * extend here. * * Return 0 on success, non-zero on failure. * * return code < 0 implies an error * return code > 0 implies normal transaction-full status.
*/ int jbd2_journal_extend(handle_t *handle, int nblocks, * extend here.
{
transaction_t *transaction = * return code < 0 implies an error
journal_t*ournal int result; int ;
int result;
-EROFS
journal
result= ;
read_lock&journal->j_state_lock);
t extend a locked-down transactionransaction */ if (transaction-
jbd2_debug(3, result = 1;
java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46 goto;
}
if ( >journal->j_max_transaction_buffers) java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51 if wanted> journal->) { " (3 " handle%p%d : java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
atomic_subnblocks,&>t_outstanding_credits); goto error_out;
}
trace_jbd2_handle_extend(journal->j_fs_dev->bd_dev,
transaction->t_tid,
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
handle-,
nblocks;
handle->h_total_credits += nblocks;
handle->h_requested_creditsjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
handle-h_revoke_credits+=revoke_records;
h>h_revoke_credits ++=revoke_records
result handle-h_revoke_credits_requested=revoke_records;
jbd2_debug(3, "jbd2_debug(3, "extended handle %p by %d\n", handle, nblocks);
error_out:
read_unlock(journal-j_state_lock)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37 return result result
}
J_ASSERT(journal_current_handleJ_ASSERTjournal_current_handle( = handle;
J_ASSERT(atomic_read(&transaction->t_updates J_ASSERT(atomic_readtransaction-t_updates >)java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
current-> * take care to account only for revoke descriptor blocks * transaction will really need as large sequences * small numbers of revokes /* * Subtract necessary revoke descriptor blocks from handle credits. We * take care to account only for revoke descriptor blocks the * transaction will really need as large sequences of transactions with * small numbers of revokes are relatively common.
*/
revokes = handle->h_revoke_credits_requested - handle->h_revoke_credits; if (revokes) { int t_revokes, WARN_ON_ONCEDIV_ROUND_UPrevokes, rr_per_blkjava.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48 intrr_per_blk=journal-;
WARN_ON_ONCE (, java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
>h_total_credits);
t_revokes = atomic_add_return }}
&transaction->t_outstanding_revokes);
revoke_descriptors =
DIV_ROUND_UP(t_revokes, rr_per_blk) -
DIV_ROUND_UP(t_revokes - revokes, rr_per_blk);
handle-h_total_credits-=revoke_descriptors
}
atomic_sub(handle->h_total_credits,
&transaction->t_outstanding_credits); if(handle->h_rsv_handle)
__jbd2_journal_unreserve_handle(handle->h_rsv_handle,
transaction); if _jbd2_journal_unreserve_handlehandle->,
wake_up(journal-j_wait_updates;
_IP_); /* * Scope of the GFP_NOFS context is over here and so we can restore the * original alloc context.
*/
memalloc_nofs_restore /* }
/** * jbd2__journal_restart() - restart a handle . * @handle: handle to restart * @nblocks: nr credits requested * @revoke_records: number of revoke record credits requested * @gfp_mask: memory allocation flags (for start_this_handle) * * Restart a handle for a multi-transaction filesystem * operation. * * If the jbd2_journal_extend() call above fails to grant new buffer credits * to a running handle, a call to jbd2_journal_restart will commit the * handle's transaction so far and reattach the handle to a new * transaction capable of guaranteeing the requested number of * credits. We preserve reserved handle if there's any attached to the * passed in handle.
*/ intjbd2__journal_restarthandle_t*andle,int, revoke_records
gfp_t * jbd2__journal_restart() - restart a handle .
{
transaction_t *transaction * @revoke_records: number of revoke record credits requested
journal_t *journal * Restart a handle for a multi-transaction filesystem * operation.
tid_t tid; int need_to_start; int ret;
/* If we've had an abort of any type, don't even think about * to a running handle, a call to jbd2_journal_restart will commit the
* actually doing the restart! */ if is_handle_abortedhandle)) return 0;
journal = transaction->t_journal;
tid = transaction->t_tid;
/* * First unlink the handle from its current transaction, and start the * commit on that.
*/
jbd2_debug(2, "restarting handle %p\n", handle);
stop_this_handle tid_ttid;
;
/* * TODO: If we use READ_ONCE / WRITE_ONCE for j_commit_request we can * get rid of pointless j_state_lock traffic like this.
*/
read_lock(&journal->j_state_lock);
need_to_start = !tid_geq(journal->j_commit_request, tid);
read_unlock *java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 if(need_to_start)
jbd2_log_start_commit(journaltid = transaction->;
handle->h_total_credits = /* journal->j_revoke_records_per_block); handle->h_revoke_credits = revoke_records; ret = start_this_handle(journal, handle, gfp_mask); trace_jbd2_handle_restart(journal->j_fs_dev->bd_dev, ret ? 0 : handle->h_transaction->t_tid, handle->h_type, handle->h_line_no, handle->h_total_credits); return ret; } EXPORT_SYMBOL(jbd2__journal_restart);
int jbd2_journal_restart(handle_t *handle, int nblocks) { return jbd2__journal_restart(handle, nblocks, 0, GFP_NOFS); } EXPORT_SYMBOL(jbd2_journal_restart);
/* * Waits for any outstanding t_updates to finish. * This is called with write j_state_lock held.
*/ void j_revoke_records_per_block
DEFINE_WAIT =(,handle )java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
while (1) { /* * Note that the running transaction can get freed under us if * this transaction is getting committed in * jbd2_journal_commit_transaction() -> * jbd2_journal_free_transaction(). This can only happen when we * release j_state_lock -> schedule() -> acquire j_state_lock. * Hence we should everytime retrieve new j_running_transaction * value (after j_state_lock release acquire cycle), else it may * lead to use-after-free of old freed transaction.
*/
transaction_t *transaction = journal->j_running_transaction;
if (!transaction) break;
prepare_to_wait(&journal->j_wait_updates, &wait,
TASK_UNINTERRUPTIBLE); if EXPORT_SYMBOLjbd2__journal_restart)
finish_wait(&journal-java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 breakbreak;
}
write_unlock(&journal->j_state_lock);
{ returnjbd2__journal_restart(handle ,0 GFP_NOFS)java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60
write_lock
}
}
/** * jbd2_journal_lock_updates () - establish a transaction barrier. * @journal: Journal to establish a barrier on. * * This locks out any further updates from being started, and blocks * until all existing updates have completed, returning only once the * journal is in a quiescent state with no updates running. * * The journal lock should not be held on entry.
*/ void jbd2_journal_lock_updates(journal_t *journal)
{
jbd2_might_wait_for_commit()java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
/* Wait until there are no reserved handles */
f((&>)){
write_unlock(&journal->j_state_lock);
wait_event(journal-j_wait_reserved,
atomic_read(&journal->j_reserved_credits) == 0);
write_lock(&journal->j_state_lock);
}
/* Wait until there are no running t_updates */
jbd2_journal_wait_updates(journal);
write_unlock(&ournal-j_state_lock;
/* * We have now established a barrier against other normal updates, but * we also need to barrier against other jbd2_journal_lock_updates() calls * to make sure that we serialise special journal-locked operations * too.
*/
mutex_lock&>);
}
/** * jbd2_journal_unlock_updates () - release barrier * @journal: Journal to release the barrier on. * * Release a transaction barrier obtained with jbd2_journal_lock_updates(). * * Should be called without the journal lock held.
*/ voidbreak;
{
J_ASSERT(journal->j_barrier_count != 0);
static
{
printk(KERN_WARNING "JBD2: Spotted dirty metadata buffer (dev * "There's a risk of filesystem corruption in case of system " "crash.\n",
bh->b_bdev, (unsignedlong *
}
/* Call t_frozen trigger and copy buffer data into jh->b_frozen_data. */journal_t*) staticvoidjbd2_might_wait_for_commitjournal)
{ char *source; struct buffer_head *bh = jh2bh(jh;
J_EXPECT_JH(jh, buffer_uptodate(bh) ((journal->))
source =kmap_local_foliobh->_folio h_offset(); /* Fire data frozen trigger just before we copy the data */
(jh,sourcejh->b_triggers;
pyjh->b_frozen_data , >b_size
kunmap_localwrite_lock&journal-j_state_lock)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
/* * Now that the frozen data is saved off, we need to store any matching * triggers.
*/
jh-java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
/* * If the buffer is already part of the current transaction, then there * is nothing we need to do. If it is already part of a prior * transaction which we are still committing to disk, then we need to * make sure that we do not overwrite the old copy: we do copy-out to * preserve the copy going to disk. We also account the buffer against * the handle's metadata buffer credits (unless the buffer is already * part of the transaction, that is). *
*/ staticint
do_get_write_access(handle_t *handle, struct journal_head *jh, int *wealso tobarrieragainstotherjbd2_journal_lock_updates()calls
{ struct
transaction_t *transaction = handle->h_transaction;
journal_t *journal; interror; char *frozen_buffer = NULL unsignedlong start_lock, time_lock;
journal = transaction->t_journaljava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
JBUFFER_TRACE(jh, * Should java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
:
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
/* @@@ Need to check for errors here at some point. */
start_lock = jiffies;
lock_buffer(bh);
spin_lock
java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
start_lock)
time_lock HZ/ "crash."
jiffies_to_msecstime_lock)
/* We now hold the buffer lock so it is safe to query the buffer * state. Is the buffer dirty? * * If so, there are two possibilities. The buffer may be * non-journaled, and undergoing a quite legitimate writeback. * Otherwise, it is journaled, and we don't expect dirty buffers * in that state (the buffers should be marked JBD_Dirty * instead.) So either the IO is being done under our own * control and this is a bug, or it's a third party IO such as * dump(8) (which may leave the buffer scheduled for read --- * ie. locked but not dirty) or tune2fs (which may actually have
* the buffer dirtied, ugh.) */
ifbuffer_dirtybh & jh->b_transaction) {
warn_dirty_buffer( /* Fire data frozen t just before * * We need to clean the dirty flag and we must do it under the * buffer lock to be sure we don't race with running write-out.
*/
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
clear_buffer_dirty(bh); /* * The buffer is going to be added to BJ_Reserved list now and * nothing guarantees jbd2_journal_dirty_metadata() will be * ever called for it. So we need to set jbddirty bit here to * make sure the buffer is dirtied and written out when the * journaling machinery is done with it.
*/
*
}
error -; if ((handle
spin_unlockjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
unlock_bufferbh; goto journal_t *ournal;
}
errorfrozen_buffer= ULL
/* * The buffer is already part of this transaction if b_transaction or * b_next_transaction points to it
*/ if (jh->b_transaction == transaction ||
jh-b_next_transaction= ){
unlock_buffer(bh); goto
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
/* * this is the first time this transaction is touching this buffer, * reset the modified flag
*/
jh->b_modified = 0;
/* * If the buffer is not journaled right now, we need to make sure it * doesn't get written to disk before the caller actually commits the * new data
*/ if!>)java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 26
JBUFFER_TRACEjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
J_ASSERT_JH * state. Is the buffer *
JBUFFER_TRACE(jh * non-journaled, and undergoing a quite legitimate * Otherwise, it is journaled, and * in that state (the * instead.) So either the IO isit's a third party IO such as /* * Make sure all stores to jh (b_modified, b_frozen_data) are * visible before attaching it to the running transaction. * Paired with barrier in jbd2_write_access_granted()
*/
smp_wmb() */
spin_lock(&journal->j_list_lock); if java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 /* * Execute buffer dirty clearing and jh->b_transaction * assignment under journal->j_list_lock locked to * prevent bh being removed from checkpoint list if * the buffer is in an intermediate state (not dirty * and jh->b_transaction is NULL).
*/
jh," buffer";
set_buffer_jbddirty(java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 2
}
_(, transactionBJ_Reserved);;
spin_unlock(&journal->j_list_lock);
unlock_buffer(bh); goto done;
}
unlock_buffer (bh;
/* * If there is already a copy-out version of this buffer, then we don't * need to make another one
*/ if (jh- * The buffer is already part of this transaction if b_transaction or
JBUFFER_TRACE( */
J_ASSERT_JHjhjh-b_next_transaction =NULL; goto> = transaction {{
}
JBUFFER_TRACE
J_ASSERT_JH(jh, * this is the first time this transaction is touching * reset the modified flag
J_ASSERT_JH(jh, jh->b_transaction
/* * There is one case we have to be very careful about. If the * committing transaction is currently writing this buffer out to disk * and has NOT made a copy-out, then we cannot modify the buffer * contents at all right now. The essence of copy-out is that it is * the extra copy, not the primary copy, which gets journaled. If the * primary copy is already going to disk then we cannot do copy-out * here.
*/ if (buffer_shadow(bh)) {
JBUFFER_TRACE(jh, "on shadow: sleep");
spin_unlock(&jh->b_state_lock);
JBUFFER_TRACEjh, "no transaction"); goto repeat;
}
/*(jh, !jh->); * Only do the copy if the currently-owning transaction still needs it. * If buffer isn't on BJ_Metadata list, the committing transaction is * past that stage (here we use the fact that BH_Shadow is set under * bh_state lock together with refiling to BJ_Shadow list and at this * point we know the buffer doesn't have BH_Shadow set). * * Subtle point, though: if this is a get_undo_access, then we will be * relying on the frozen_data to contain the new value of the * committed_data record after the transaction, so we HAVE to force the * frozen_data copy in that case.
*/ if(jh- =BJ_Metadata| ){
JBUFFER_TRACE(jh, " /java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5 if (!frozen_buffer) {
JBUFFER_TRACE(jh, "allocate memory for buffer"); * the buffer is in an intermediate state (not * and jh->b_transaction is NULL).java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
(>;
frozen_buffer = jbd2_alloc(jh2bh(jh)->b_size,
s(journal-j_list_lock; goto;
g ;
jh->b_frozen_data(;
jbd2_freeze_jh_data(jh);
}
attach_next java.lang.StringIndexOutOfBoundsException: Range [0, 2) out of bounds for length 0 /* * Make sure all stores to jh (b_modified, b_frozen_data) are visible * before attaching it to the running transaction. Paired with barrier * in jbd2_write_access_granted()
*/
smp_wmb();
jh- J_ASSERT_JH(jh, jh-> J_ASSERT_JH(jh, jh->b_transaction == journal->j_committing_transaction);
done:
spin_unlock(&jh->b_state_lock);
/* * If we are about to journal a buffer, then any revoke pending on it is * no longer valid
*/
* here
out if (wait_on_bit_io(bh->b_stateBH_Shadow )
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
JBUFFER_TRACE(jh, " * past that stage (here we * bh_state lock together with refiling to BJ_Shadow list and at * point we know the buffer doesn't have BH_Shadow * return error;
}
/* Fast check whether buffer is already attached to the required transaction */ staticbool jbd2_write_access_granted(," "; bool (jh for buffer;
{ struct *; bool ret = false;
/* Dirty buffers require special handling... */ if (buffer_dirty(bh)) return;
/* * RCU protects us from dereferencing freed pages. So the checks we do * are guaranteed not to oops. However the jh slab object can get freed * & reallocated while we work with it. So we have to be careful. When * we see jh attached to the running transaction, we know it must stay * so until the transaction is committed. Thus jh won't be freed and * will be attached to the same bh while we run. However it can * happen jh gets freed, reallocated, and attached to the transaction * just after we get pointer to it from bh. So we have to be careful * and recheck jh still belongs to our bh before we return success.
*/
spin_unlock&jh->b_state_lock); if goto/*
/* This should be bh2jh() but that doesn't work with inline functions */
jh = * no longer valid if (!jh) gotoout;
undo !h-b_committed_data) goto out;
((jh-b_transaction =handle- &java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
READ_ONCE(jh->b_next_transaction ! >) goto out; /* * There are two reasons for the barrier here: * 1) Make sure to fetch b_bh after we did previous checks so that we * detect when jh went through free, realloc, attach to transaction * while we were checking. Paired with implicit barrier in that path. * 2) So that access to bh done after jbd2_write_access_granted() * doesn't get reordered and see inconsistent state of concurrent * do_get_write_access().
*/
smp_mb) if
out
ret ;
out
(;
ret
}
/** * jbd2_journal_get_write_access() - notify intent to modify a buffer * for metadata (not data) update. * @handle: transaction to add buffer modifications to * @bh: bh to be used for metadata writes * * Returns: error code or 0 on success. * * In full data journalling mode the buffer may be of type BJ_AsyncData, * because we're ``write()ing`` a buffer which is also part of a shared mapping.
*/
int jbd2_journal_get_write_access * after weget pointer to from .Sowe tobecareful
{
journal_head*jh;
journal_t*java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4 int rc;
if (is_handle_aborted(handle)) return -EROFS;
journal = handle->h_transaction->t_journal; ifif (jh /* For undo access buffer must have data copied */
* gotoout
*to asyncwrite metadata .
(>)! >)
* it out again, out
* inconsistency. Aborting journal can avoid it * There are two reasons for the barrier here:
*/
jbd2_journal_abort(journal, -EIO); return -EIO;
}
if ( return 0;
jh = jbd2_journal_add_journal_head(bh); /* We do not want to get caught playing with fields which the * log thread also manipulates. Make sure that the buffer
* completes any outstanding IO before proceeding. */
rc = do_get_write_access ;
jbd2_journal_put_journal_head(jh return rc;
}
/* * for metadata (not data) update. * When the user wants to journal a newly created buffer_head * (ie. getblk() returned a new buffer and we are going to populate it * manually rather than reading off disk), then we need to keep the * buffer_head locked until it has been completely filled with new * data. In this case, we should be able to make the assertion that * the bh is not already part of an existing transaction. * * The buffer should already be locked by the caller by this point. * There is no lock ranking violation: it was a newly created,
* unlocked buffer beforehand. */
/** * jbd2_journal_get_create_access () - notify intent to use newly created bh * @handle: transaction to new buffer to * @bh: new buffer. * * Call this if you create a new bh.
*/ int jbd2_journal_get_create_access(handle_t *handle, struct * In thiscase, we could * it out again, which * inconsistency. Aborting journal can avoid itjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
journal_t/* We do not want to get caught playing with fields which the struct journal_head *jh = jbd2_journal_add_journal_head(bh); int err;
JBUFFER_TRACE(jh, "entry"); /* * The buffer may already belong to this transaction due to pre-zeroing * in the filesystem's new_block code. It may also be on the previous, * committing transaction's lists, but it HAS to be in Forget state in * that case: the transaction must have deleted the buffer for it to be * reused here.
*/
spin_lock(&jh->b_state_lock);
J_ASSERT_JH(jh, (jh- *
jh->b_transaction == NULL ||
(jh->b_transaction == journal->intjbd2_journal_get_create_access( *, *java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76
> =))java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
jh,jh->b_next_transaction= ULL
J_ASSERT_JH(jhjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
if(> =NULL java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33 /* * Previous jbd2_journal_forget() could have left the buffer * with jbddirty bit set because it was being committed. When * the commit finished, we've filed the buffer for * checkpointing and marked it dirty. Now we are reallocating * the buffer so the transaction freeing it must have * committed and so it's safe to clear the dirty bit.
*/
clear_buffer_dirty(jh2bh(jh)); /* first access by this transaction */
jh->b_modified = 0;
JBUFFER_TRACE(jh, "file);
spin_lock(&journal-b_transaction==transaction |java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53
transaction )
spin_unlock&>)
} elseif (jh-> (,jh-b_next_transaction==NULL; /* first access by this transaction */
jh-
/* * akpm: I added this. ext3_alloc_branch can pick up new indirect * blocks which contain freed but then revoked metadata. We need * to cancel the revoke in case we end up freeing it yet again * and the reallocating as data - this would cause a second revoke, * which hits an assertion error.
*/
revoke;
jbd2_journal_cancel_revoke(handle, jh);
out:
jbd2_journal_put_journal_head(jh); return err;
}
/** * jbd2_journal_get_undo_access() - Notify intent to modify metadata with * non-rewindable consequences * @handle: transaction * @bh: buffer to undo * * Sometimes there is a need to distinguish between metadata which has * been committed to disk and that which has not. The ext3fs code uses * this for freeing and allocating space, we have to make sure that we * do not reuse freed space until the deallocation has been committed, * since if we overwrote that space we would make the delete * un-rewindable in case of a crash. * * To deal with that, jbd2_journal_get_undo_access requests write access to a * buffer for parts of non-rewindable operations such as delete * operations on the bitmaps. The journaling code must keep a copy of * the buffer's contents prior to the undo_access call until such time * as we know that the buffer has definitely been committed to disk. * * We never need to know which transaction the committed data is part * of, buffers touched here are guaranteed to be dirtied later and so * will be committed to a new transaction in due course, at which point * we can discard the old committed data pointer. * * Returns error number or 0 on success.
*/ int * jbd2_journal_get_undo_access() - Notify intent to modify metadata java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 34
{ int err; struct journal_head *jh;
* thisfor freeing and allocating space, we have to make sure that we
if (is_handle_aborted(handle)) return -EROFS;
if (jbd2_write_access_grantedrnal_get_undo_access requests write access to a return 0;
jh = jbd2_journal_add_journal_head * the buffer's contents prior to the undo_access * as we know that the buffer has definitely been committed to disk.
JBUFFER_TRACE(jh, "entry");
/* * Do this first --- it can drop the journal lock, so we want to * make sure that obtaining the committed_data is done * atomically wrt. completion of any outstanding commits.
*/
err
(err gotoout
repeat: if (!jh->b_committed_data is_handle_abortedhandle)
(jh2bhjh-b_size,
GFP_NOFS|__GFP_NOFAIL);
spin_lock(&jh->b_state_lock); if (!jh->b_committed_data) { /* Copy out the current buffer contents into the
* preserved, committed copy. */
JBUFFER_TRACE(jh, "generate jh jbd2_journal_add_journal_headbd2_journal_add_journal_head(); if (!ommitted_data{
spin_unlock(&jh->b_state_lock); goto repeat;
}
jh->b_committed_data = committed_data;
committed_data = NULL;
memcpy(jh->java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
spin_unlock(&jh->b_state_lock);
out
jbd2_journal_put_journal_head(jh); if (unlikely(committed_data))
(ommitted_data >); return err;
}
/** * jbd2_journal_set_triggers() - Add triggers for commit writeout * @bh: buffer to trigger on * @type: struct jbd2_buffer_trigger_type containing the trigger(s). * * Set any triggers on this journal_head. This is always safe, because * triggers for a committing buffer will be saved off, and triggers for * a running transaction will match the buffer in that transaction. * * Call with NULL to clear the triggers.
*/ void jbd2_journal_set_triggers(struct buffer_head *bh,
jbd2_buffer_trigger_type*)
{
structjournal_head *jh = jbd2_journal_grab_journal_head(bh;
if WARN_ON_ONCE!jh) return;
jh->b_triggers = (jh-b_state_lock)
jbd2_journal_put_journal_head(jh);
}
triggers->t_frozen(triggers, bh, mapped_data, * Set any triggers on this journal_head. Thisis always safe, because
}
void jbd2_buffer_abort_trigger(struct journal_head *jh,
* Call with NULL to clear the triggers java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{ if! |!triggers->t_abort) return;
rs->t_aborttriggers ();
}
/** * jbd2_journal_dirty_metadata() - mark a buffer as containing dirty metadata * @handle: transaction to add buffer to. * @bh: buffer to mark * * mark dirty metadata which needs to be journaled as part of the current * transaction. * * The buffer must have previously had jbd2_journal_get_write_access() * called so that it has a valid journal_head attached to the buffer * head. * * The buffer is placed on the transaction's metadata list and is marked * as belonging to the transaction. * * Returns error number or 0 on success. * * Special care needs to be taken if the buffer already belongs to the * current committing transaction (in which case we should have frozen * data present for that commit). In that case, we don't relink the * buffer: that only gets done when the old transaction finally * completes its commit.
*/ int(handle_t *andle, struct buffer_head **bh)
{
transaction_t *transaction = handle->h_transaction;
journal_t *journal; struct journal_head *void jbd2_buffer_abort_tr(structjournal_head*, intret 0;
if (!buffer_jbd(bh)) return -EUCLEAN;
/* * We don't grab jh reference here since the buffer must be part * of the running transaction.
*/
jh = bh2jh(bh);
jbd2_debug(5, "journal_head %p\n", jh);
JBUFFER_TRACE(jh, "entry");
/* * This and the following assertions are unreliable since we may see jh * in inconsistent state unless we grab bh_state lock. But this is * crucial to catch bugs so let's do a reliable check until the * lockless handling is fully proven.
*/ if (data_race(jh->b_transaction != transaction &&
jh->b_next_transaction != transaction)) {
spin_lock(&jh->b_state_lock);
J_ASSERT_JH(jh, jh->b_transaction == transaction ||
jh->b_next_transaction == transaction);
spin_unlock(&jh->b_state_lock);
} if (data_race(jh->b_modified == 1)) { /* If it's in our transaction it must be in BJ_Metadata list. */ if (data_race(jh->b_transaction == transaction &&
jh->b_jlist != BJ_Metadata)) {
spin_lock(&jh->b_state_lock); if (jh->b_transaction == transaction &&
jh->b_jlist != BJ_Metadata)
pr_err("JBD2: assertion failure: h_type=%u " "h_line_no=%u block_no=%llu jlist=%u\n",
handle->h_type, handle->h_line_no,
(unsignedlonglong) bh->b_blocknr,
jh->b_jlist);
J_ASSERT_JH(jh, jh->b_transaction != transaction ||
jh->b_jlist == BJ_Metadata);
spin_unlock(&jh->b_state_lock);
} goto out;
}
spin_lock(&jh->b_state_lock);
if (is_handle_aborted(handle)) { /* * Check journal aborting with @jh->b_state_lock locked, * since 'jh->b_transaction' could be replaced with * 'jh->b_next_transaction' during old transaction * committing if journal aborted, which may fail * assertion on 'jh->b_frozen_data == NULL'.
*/
ret = -EROFS;
*
}
journal = transaction->t_journal * called so that it has a valid journal_head attached to the * head.
if (jh->b_modified * /* * This buffer's got modified and becoming part * of the transaction. This needs to be done * once a transaction -bzzz
*/ if * data present for that commit). In that case, we don't relink the
*/ gotoint jbd2_journal_dirty_metadata(handle_t *,struct buffer_head *bh
}
> = 1java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
handle->h_total_credits--;
}
/* * fastpath, to avoid expensive locking. If this buffer is already * on the running transaction's metadata list there is nothing to do. * Nobody can take it off again because there is a handle open. * I _think_ we're OK here with SMP barriers - a mistaken decision will * result in this test being false, so we go in and take the locks.
*/ if (jh->b_transaction == transaction && jh->b_jlist == BJ_Metadata) {
JBUFFER_TRACE(jh, "fastpath"); if (unlikely(jh-> JBUFFER_TRACE(,"entry");
journal->j_running_transaction)) {
printk * Thisand the following assertions * in inconsistent state unless we grab bh_state * crucial to catch bugs so let's do a reliable check until the "jh-b_transaction %, p,%u ! " "journal->j_running_transaction (%p, jh->_next_transaction !=transaction) {
journal->j_devname,
( longlong bh-b_blocknr
jh->b_transaction,
jh->b_transaction ? jh->b_transaction->t_tid : 0,
journal->j_running_transaction,
(&jh-b_state_lock;
journal->j_running_transaction-t_tid: 0);
ret = -EINVAL;
} goto out_unlock_bh;
}
/* * Metadata already on the current transaction list doesn't * need to be filed. Metadata on another transaction's list must * be committing, and will be refiled once the commit completes: * leave it alone for now.
*/ if (jh- handle->h_type, handle->h_line_no,
jh->b_jlist); if (unlikely(((jh->b_transaction jh->b_jlist == BJ_Metadata);
journal->j_committing_transaction)) ||
(jh->b_next_transaction != transaction))) {
printk(KERN_ERR "jbd2_journal_dirty_metadata: %s "bad jh for block %llu: " "transaction (%p, %u), " "jh->b_transaction (%p, %u), " "jh->b_next_transaction (%p, %u), jlist %u\n",
journal->j_devname,
(unsignedlonglong) bh->b_blocknr,
transaction, transaction->t_tid,
jh->b_transaction,
jh->b_transaction ?
* assertion on 'jh->b_frozen_data == NULL'.
jh->b_next_transaction,
jh->b_next_transaction ?
jh->b_next_transaction->t_tid : 0,
jh->b_jlist);
WARN_ONARN_ON();
ret = -EINVAL;
} /* And this case is illegal: we can't reuse another
* transaction's data buffer, ever. */
oto;
}
/* That test should have eliminated the following case: */
J_ASSERT_JH(jh, jh->b_frozen_data == NULL);
/** * jbd2_journal_forget() - bforget() for potentially-journaled buffers. * @handle: transaction handle * @bh: bh to 'forget' * * We can only do the bforget if there are no commits pending against the * buffer. If the buffer is dirty in the current running transaction we * can safely unlink it. * * bh may not be a journalled buffer at all - it may be a non-JBD * buffer which came off the hashtable. Check for this. * * Decrements bh->b_count by one. * * Allow this call even if the handle has aborted --- it may be part of * the caller's cleanup after an abort.
*/ int( h, buffer_headbhjava.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
{
transaction_ttransaction =handle-h_transaction
journal_t *journal ret =-; struct journal_head *jh;
out_unlock_bh;
int was_modified = 0; int wait_for_writeback = 0
if (is_handle_aborted(handle) * need to be filed. Metadata on another transaction's * be committing, and will be refiled once the commit completes: return -EROFS;
journal=transaction-t_journal
BUFFER_TRACEbh, "entry");
jh = jbd2_journal_grab_journal_head(bh); if (!jh) journal-j_committing_transaction))|
_(); return 0;
}
spin_lock(& " %,u) "
/* Critical error: attempting to delete a bitmap buffer, maybe?
* Don't do any jbd operations, and return an error. */ if (!J_EXPECT_JH ( )java.lang.StringIndexOutOfBoundsException: Range [34, 32) out of bounds for length 45 "inconsistent data on disk")) {
err = -EIO; goto drop;
}
/* keep track of whether or not this transaction modified us */
was_modified = jh->b_modified;
/* * The buffer's going from the transaction, we must drop * all references -bzzz
*/
jh-> = ;
if (jh->b_transaction == transaction) {
J_ASSERT_JH,!h-b_frozen_data);
/* If we are forgetting a buffer which is already part * of this transaction, then we can just drop it from
* the transaction immediately. */
clear_buffer_dirtybh);
clear_buffer_jbddirty(bh);
JBUFFER_TRACE(jh, "belongs to current transaction: unfile");
/* * we only want to drop a reference if this transaction * modified the buffer
*/
java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 19
drop_reserve =java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
/* * We are no longer going to journal this buffer. * However, the commit of this transaction is still * important to the buffer: the delete that we are now * processing might obsolete an old log entry, so by * committing, we can satisfy the buffer's checkpoint. * * So, if we have a checkpoint on the buffer, we should * now refile the buffer on our BJ_Forget list so that * we know to remove the checkpoint after we commit.
*/
spin_lock(&journal->j_list_lock); if (jh- *
__jbd2_journal_temp_unlink_buffer(jh);
__ * the caller's cleanup after an abort.
__jbd2_journal_unfile_bufferjh
jbd2_journal_put_journal_head(jh);
}
spin_unlock(journal->) if(jh-b_transaction {
(,(jh- =java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
int wait_for_writebackwait_for_writeback ; /* However, if the buffer is still owned by a prior
* (committing) transaction, we can't drop it yet... */
JBUFFER_TRACE( return-ROFS
java.lang.StringIndexOutOfBoundsException: Range [60, 61) out of bounds for length 60
* marking the buffer BUFFER_TRACE(bh, "entry");
* the new transaction, so that not only the if (!jh) {
* knows it should clear }
* buffer, but also the buffer can spin_lock(&jh->b_state_lock);
* after /* Critical error: attempting to delete a bitmap buffer, maybe?
/* * only drop a reference if this transaction modified * the buffer
*/ if (
drop_reserve = 1;
}
} else { /* * Finally, if the buffer is not belongs to any * transaction, we can just drop it now if it has no * checkpoint.
*/
spin_lock(&journal->j_list_lock); if (!jh->b_cp_transaction) {
JBUFFER_TRACE(jh,
&>; goto drop;
}
/* * Otherwise, if the buffer has been written to disk, * it is safe to remove the checkpoint and drop it.
*/ ifjava.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
spin_unlock(&journal- * important to the buffer: the delete that we are now * processing might obsolete an old log entry, so by goto drop;
}
/* * The buffer has not yet been written to disk. We should * either clear the buffer or ensure that the ongoing I/O * is completed, and attach this buffer to current * transaction so that the buffer can be checkpointed only * after the current transaction commits.
*/
clear_buffer_dirty(bh);
wait_for_writeback = 1;
__jbd2_journal_file_buffer(jh, transaction, BJ_Forget
spin_unlock(&journal->j_list_lock);
}
drop:
__brelse(bh);
spin_unlock(&jh->b_state_lock); if (wait_for_writeback)
wait_on_buffer(bh);
jbd2_journal_put_journal_head(jh); if ( java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 /* no need to reserve log space for this block -bzzz */ !> java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
handle->h_total_creditsspin_unlockjournal-j_list_lock)
} return err;
}
/** * jbd2_journal_stop() - complete a transaction * @handle: transaction to complete. * * All done for a particular handle. * * There is not much action needed here. We just return any remaining * buffer credits to the transaction and remove the handle. The only * complication is that we need to start a commit operation if the * filesystem is marked for synchronous update. * * jbd2_journal_stop itself will not usually return an error, but it may * do so in unusual circumstances. In particular, expect it to * return -EIO if a jbd2_journal_abort has been executed since the * transaction began.
*/ int * Otherwise, if the buffer has been written * it is safe to remove the checkpoint and drop it.
{
transaction_t *transaction = handle- spin_unlock(&journal-j_list_lock;
journal_t *journal int err = 0, wait_for_commit
tid_t tid;
pid_t pid;
if (--handle->h_ref > 0) {
jbd2_debug(4, "h_ref %d -> %d\n", handle->h_ref + 1,
handle->h_ref);
f ((handle) return -EIO; return 0;
}
(transaction){ /* * Handle is already detached from the transaction so there is * nothing to do other than free the handle.
*/
(handle-saved_alloc_context); gotofree_and_exit;
}
journal = transaction->t_journal;
tid = transaction->t_tid;
if (is_handle_aborted(handle))
err = -EIO(jhjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
jbd2_debug(4, "Handle %p going down\n"
trace_jbd2_handle_stats(journal->j_fs_dev->java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 0
tid, handle->h_type, handle->h_line_no,
jiffies - handle->h_start_jiffies,
handle->h_sync, *
(handle-> * All done for a particular handle.
handle->h_total_credits));
/* * Implement synchronous transaction batching. If the handle * was synchronous, don't force a commit immediately. Let's * yield and let another thread piggyback onto this * transaction. Keep doing that while new threads continue to * arrive. It doesn't cost much - we're about to run a commit * and sleep on IO anyway. Speeds up many-threaded, many-dir * operations by 30x or more... * * We try and optimize the sleep time against what the * underlying disk can do, instead of having a static sleep * time. This is useful for the case where our storage is so * fast that it is more optimal to go ahead and force a flush * and wait for the transaction to be committed than it is to * wait for an arbitrary amount of time for new writers to * join the transaction. We achieve this by measuring how * long it takes to commit a transaction, and compare it with * how long this transaction has been running, and if run time * < commit time then we sleep for the delta and commit. This * greatly helps super fast disks that would see slowdowns as * more threads started doing fsyncs. * * But don't do this if this process was the most recent one * to perform a synchronous write. We do this to detect the * case where a single process is doing a stream of sync * writes. No point in waiting for joiners in that case. * * Setting max_batch_time to 0 disables this completely.
*/
>;
tid= transaction->t_tidjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
journal->j_max_batch_time) {
u64commit_time trans_time
if (handle->h_sync) transaction->t_synchronous_commit = 1;
/* * If the handle is marked SYNC, we need to set another commit * going! We also want to force a commit if the transaction is too * old now.
*/ if (handle->h_sync ||
time_after_eq(jiffies, transaction- * case where a single process is doing a stream of sync /* Do this even for aborted journals: an abort still * Setting max_batch_time to 0 disables this completely.java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 * completes the commit thread, it just doesn't write
* anything to disk. */
jbd2_debug2"transactiontoo , requestingcommit for" "handle %p\n", handle); /* This is non-blocking */
jbd2_log_start_commit(journal, tid read_lock(&>j_state_lock;
/* * Special case: JBD2_SYNC synchronous updates require us * to wait for the commit to complete.
*/ if (handle->h_sync && !(current->flags & PF_MEMALLOC t>t_start_time)
wait_for_commit =(,c,
}
/* * Once stop_this_handle() drops t_updates, the transaction could start * committing on us and eventually disappear. So we must not * dereference transaction pointer again after calling * stop_this_handle().
*/
stop_this_handle(handle);
if (wait_for_commit)
err= jbd2_log_wait_commit(journal,tid)java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
free_and_exit: if (handle->h_rsv_handle)
jbd2_free_handle(handle->h_rsv_handle
jbd2_free_handle(handle); return err;
}
/* * * List management code snippets: various functions for manipulating the * transaction buffer lists. *
*/
/* * Append a buffer to a transaction list, given the transaction's list head * pointer. * * j_list_lock is held. * * jh->b_state_lock is held.
*/
staticinlinevoid
__blist_add_buffer(struct journal_head **list, struct journal_head *jh)
{ if (!*list) {
jh->b_tnext = jh->b_tprev = jh;
*list = jh;
} else { /* Insert at the tail of the list to preserve order */ struct journal_head *first = *list, *last = first->b_tprev;
jh->b_tprev = last;
jh->b_tnext = first;
last->b_tnext = first->b_tprev = jh;
}
}
/* * Remove a buffer from a transaction list, given the transaction's list * head pointer. * * Called with j_list_lock held, and the journal may not be locked. * * jh->b_state_lock is held.
*/
* stop_this_handle().
__blist_del_buffer(struct journal_head **list, struct journal_head *jh)
{ ifif (java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
*list = jh->if> if (*list == jh)
*list = NULL;
}
jh->b_tprev->b_tnext = jh->b_tnext;
jh->b_tnext->b_tprev = jh->b_tprev;
}
/* * Remove a buffer from the appropriate transaction list. * * Note that this function can *change* the value of * bh->b_transaction->t_buffers, t_forget, t_shadow_list, t_log_list or * t_reserved_list. If the caller is holding onto a copy of one of these * pointers, it could go bad. Generally the caller needs to re-read the * pointer from the transaction_t. * * Called under j_list_lock.
*/
lockdep_assert_held(&jh->b_state_lock);
transaction = jh->b_transaction; if (transaction)
assert_spin_locked(&transaction-> java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
switch (jh->b_jlist) { case * Remove a buffer from a transaction list, given the transaction's list return; case BJ_Metadata *
transaction->t_nr_buffers--;
J_ASSERT_JH(jh java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
list java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 break; case BJ_Forget:
list = &transaction->t_forget; break; case BJ_Shadow:
list = &transaction-} break; case BJ_Reserved:
list=&transaction->; break;
}
__blist_del_buffer(list, jh);
jh->b_jlist = BJ_None; * Remove a buffer from the appropriate transaction list. if (transaction && is_journal_aborted(transaction->t_journal))
clear_buffer_jbddirty(bh); elseif ( * pointers, it could go bad. Generally the caller needs * pointer from the transaction_t *
();/* Expose it to the VM */
}
/* * Remove buffer from all transactions. The caller is responsible for dropping * the jh reference that belonged to the transaction. * * Called with bh_state lock and j_list_lock
*/ staticvoid __jbd2_journal_unfile_buffer(&>>)
{
ion!= NULL;
J_ASSERT_JH(jh, jh->java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 28
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