On Fri, Dec 04, 2020 at 12:10:25AM +0800, Gao Xiang wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
>
> So xfs_ialloc() will only address in-core inode allocation then.
>
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
> Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxx>
Looks good to me, I never liked ialloc_context anyway.
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
--D
> ---
> fs/xfs/xfs_inode.c | 200 +++++++++++++++------------------------------
> 1 file changed, 65 insertions(+), 135 deletions(-)
>
> diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> index 4ebfb1a18f0f..34eca1624397 100644
> --- a/fs/xfs/xfs_inode.c
> +++ b/fs/xfs/xfs_inode.c
> @@ -761,68 +761,25 @@ xfs_inode_inherit_flags2(
> }
>
> /*
> - * Allocate an inode on disk and return a copy of its in-core version.
> - * The in-core inode is locked exclusively. Set mode, nlink, and rdev
> - * appropriately within the inode. The uid and gid for the inode are
> - * set according to the contents of the given cred structure.
> - *
> - * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
> - * has a free inode available, call xfs_iget() to obtain the in-core
> - * version of the allocated inode. Finally, fill in the inode and
> - * log its initial contents. In this case, ialloc_context would be
> - * set to NULL.
> - *
> - * If xfs_dialloc() does not have an available inode, it will replenish
> - * its supply by doing an allocation. Since we can only do one
> - * allocation within a transaction without deadlocks, we must commit
> - * the current transaction before returning the inode itself.
> - * In this case, therefore, we will set ialloc_context and return.
> - * The caller should then commit the current transaction, start a new
> - * transaction, and call xfs_ialloc() again to actually get the inode.
> - *
> - * To ensure that some other process does not grab the inode that
> - * was allocated during the first call to xfs_ialloc(), this routine
> - * also returns the [locked] bp pointing to the head of the freelist
> - * as ialloc_context. The caller should hold this buffer across
> - * the commit and pass it back into this routine on the second call.
> - *
> - * If we are allocating quota inodes, we do not have a parent inode
> - * to attach to or associate with (i.e. pip == NULL) because they
> - * are not linked into the directory structure - they are attached
> - * directly to the superblock - and so have no parent.
> + * Initialise a newly allocated inode and return the in-core inode to the
> + * caller locked exclusively.
> */
> -static int
> +static struct xfs_inode *
> xfs_ialloc(
> - xfs_trans_t *tp,
> - xfs_inode_t *pip,
> - umode_t mode,
> - xfs_nlink_t nlink,
> - dev_t rdev,
> - prid_t prid,
> - xfs_buf_t **ialloc_context,
> - xfs_inode_t **ipp)
> + struct xfs_trans *tp,
> + struct xfs_inode *pip,
> + xfs_ino_t ino,
> + umode_t mode,
> + xfs_nlink_t nlink,
> + dev_t rdev,
> + prid_t prid)
> {
> - struct xfs_mount *mp = tp->t_mountp;
> - xfs_ino_t ino;
> - xfs_inode_t *ip;
> - uint flags;
> - int error;
> - struct timespec64 tv;
> - struct inode *inode;
> -
> - /*
> - * Call the space management code to pick
> - * the on-disk inode to be allocated.
> - */
> - error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode,
> - ialloc_context, &ino);
> - if (error)
> - return error;
> - if (*ialloc_context || ino == NULLFSINO) {
> - *ipp = NULL;
> - return 0;
> - }
> - ASSERT(*ialloc_context == NULL);
> + struct xfs_mount *mp = tp->t_mountp;
> + struct xfs_inode *ip;
> + unsigned int flags;
> + int error;
> + struct timespec64 tv;
> + struct inode *inode;
>
> /*
> * Protect against obviously corrupt allocation btree records. Later
> @@ -833,18 +790,16 @@ xfs_ialloc(
> */
> if ((pip && ino == pip->i_ino) || !xfs_verify_dir_ino(mp, ino)) {
> xfs_alert(mp, "Allocated a known in-use inode 0x%llx!", ino);
> - return -EFSCORRUPTED;
> + return ERR_PTR(-EFSCORRUPTED);
> }
>
> /*
> - * Get the in-core inode with the lock held exclusively.
> - * This is because we're setting fields here we need
> - * to prevent others from looking at until we're done.
> + * Get the in-core inode with the lock held exclusively to prevent
> + * others from looking at until we're done.
> */
> - error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE,
> - XFS_ILOCK_EXCL, &ip);
> + error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
> if (error)
> - return error;
> + return ERR_PTR(error);
> ASSERT(ip != NULL);
> inode = VFS_I(ip);
> inode->i_mode = mode;
> @@ -926,20 +881,19 @@ xfs_ialloc(
>
> /* now that we have an i_mode we can setup the inode structure */
> xfs_setup_inode(ip);
> -
> - *ipp = ip;
> - return 0;
> + return ip;
> }
>
> /*
> - * Allocates a new inode from disk and return a pointer to the
> - * incore copy. This routine will internally commit the current
> - * transaction and allocate a new one if the Space Manager needed
> - * to do an allocation to replenish the inode free-list.
> - *
> - * This routine is designed to be called from xfs_create and
> - * xfs_create_dir.
> + * Allocates a new inode from disk and return a pointer to the incore copy. This
> + * routine will internally commit the current transaction and allocate a new one
> + * if we needed to allocate more on-disk free inodes to perform the requested
> + * operation.
> *
> + * If we are allocating quota inodes, we do not have a parent inode to attach to
> + * or associate with (i.e. dp == NULL) because they are not linked into the
> + * directory structure - they are attached directly to the superblock - and so
> + * have no parent.
> */
> int
> xfs_dir_ialloc(
> @@ -954,83 +908,59 @@ xfs_dir_ialloc(
> xfs_inode_t **ipp) /* pointer to inode; it will be
> locked. */
> {
> - xfs_trans_t *tp;
> xfs_inode_t *ip;
> xfs_buf_t *ialloc_context = NULL;
> - int code;
> -
> - tp = *tpp;
> - ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
> + xfs_ino_t pino = dp ? dp->i_ino : 0;
> + xfs_ino_t ino;
> + int error;
>
> - /*
> - * xfs_ialloc will return a pointer to an incore inode if
> - * the Space Manager has an available inode on the free
> - * list. Otherwise, it will do an allocation and replenish
> - * the freelist. Since we can only do one allocation per
> - * transaction without deadlocks, we will need to commit the
> - * current transaction and start a new one. We will then
> - * need to call xfs_ialloc again to get the inode.
> - *
> - * If xfs_ialloc did an allocation to replenish the freelist,
> - * it returns the bp containing the head of the freelist as
> - * ialloc_context. We will hold a lock on it across the
> - * transaction commit so that no other process can steal
> - * the inode(s) that we've just allocated.
> - */
> - code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid, &ialloc_context,
> - &ip);
> + ASSERT((*tpp)->t_flags & XFS_TRANS_PERM_LOG_RES);
> + *ipp = NULL;
>
> /*
> - * Return an error if we were unable to allocate a new inode.
> - * This should only happen if we run out of space on disk or
> - * encounter a disk error.
> + * Call the space management code to pick the on-disk inode to be
> + * allocated and replenish the freelist. Since we can only do one
> + * allocation per transaction without deadlocks, we will need to
> + * commit the current transaction and start a new one.
> + * If xfs_dialloc did an allocation to replenish the freelist, it
> + * returns the bp containing the head of the freelist as
> + * ialloc_context. We will hold a lock on it across the transaction
> + * commit so that no other process can steal the inode(s) that we've
> + * just allocated.
> */
> - if (code) {
> - *ipp = NULL;
> - return code;
> - }
> - if (!ialloc_context && !ip) {
> - *ipp = NULL;
> - return -ENOSPC;
> - }
> + error = xfs_dialloc(*tpp, pino, mode, ialloc_context, &ino);
> + if (error)
> + return error;
>
> /*
> * If the AGI buffer is non-NULL, then we were unable to get an
> * inode in one operation. We need to commit the current
> - * transaction and call xfs_ialloc() again. It is guaranteed
> + * transaction and call xfs_ialloc() then. It is guaranteed
> * to succeed the second time.
> */
> if (ialloc_context) {
> - code = xfs_dialloc_roll(&tp, ialloc_context);
> - if (code) {
> - *ipp = NULL;
> - return code;
> - }
> -
> - /*
> - * Call ialloc again. Since we've locked out all
> - * other allocations in this allocation group,
> - * this call should always succeed.
> - */
> - code = xfs_ialloc(tp, dp, mode, nlink, rdev, prid,
> - &ialloc_context, &ip);
> -
> + error = xfs_dialloc_roll(tpp, ialloc_context);
> + if (error)
> + return error;
> /*
> - * If we get an error at this point, return to the caller
> - * so that the current transaction can be aborted.
> + * Call dialloc again. Since we've locked out all other
> + * allocations in this allocation group, this call should
> + * always succeed.
> */
> - if (code) {
> - *tpp = tp;
> - *ipp = NULL;
> - return code;
> - }
> - ASSERT(!ialloc_context && ip);
> -
> + error = xfs_dialloc(*tpp, pino, mode, ialloc_context, &ino);
> + if (error)
> + return error;
> + ASSERT(!ialloc_context);
> }
>
> - *ipp = ip;
> - *tpp = tp;
> + if (ino == NULLFSINO)
> + return -ENOSPC;
>
> + /* Initialise the newly allocated inode. */
> + ip = xfs_ialloc(*tpp, dp, ino, mode, nlink, rdev, prid);
> + if (IS_ERR(ip))
> + return PTR_ERR(ip);
> + *ipp = ip;
> return 0;
> }
>
> --
> 2.18.4
>
